Prairie Crop Disease Monitoring Network

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of  prairie pathologists working together to support in-field disease management in field crops.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is offered to the public for informational purposes only.  Read the OVERVIEW describing the collaborative nature of this effort and the methods employed.  

Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, June 23-29, 2020

1. Pacific Northwest
i. There were a moderate number of reverse wind trajectories that passed over the PNW region and into the prairies.  Locations with the highest number of days with events (4-5) with reverse trajectories from the PNW included: Lethbridge (5), AB; and Gainsborough (5), Kindersley (4), and Regina (5) SK.  The remaining locations in Alberta, Saskatchewan and Manitoba had 1-2 days with events, except for Fort Vermilion, Grande Prairie, Manning, Sedgewick and Wanham, AB, which had no events from June 23-29, 2020 (Table 1).  

ii. Currently there appears to be relatively low levels of stripe rust development on commercial winter wheat crop in the PNW.  The spring wheat crop is somewhat smaller in acreage and appears to have limited stripe rust development, while fungicide applications may limit further stripe rust development in PNW spring wheat crops.  

iii. Prairie temperatures were warmest in MB and eastern SK and seven day cumulative varied across the prairies (Figure 7).  Average 7 day temperatures continue to be warmest across MB and eastern SK and coolest across most of AB (Figure 7) . The weekly average temperature at Winnipeg (20.8 °C) was 6 °C warmer than Grande Prairie.  Cumulative rainfall for the past 7 days was variable (Figure 9). Cumulative 30 day rainfall was greatest across central regions of AB. Rainfall amounts were lower across the southern prairies (Figure 10).  

iv. Winter wheat crops are progressing into flowering or are finishing flowering, while Prairie spring wheat development ranges from tillering to booting/head emergence.  

v. There have been reports of stripe rust in western Idaho and on June 16 and June 30, 2020 from southern Alberta, specifically the Counties of Lethbridge, Cardston, and Forty-Mile.  On June 19, 2020 there was a report in Alberta with the observation of stripe rust in winter wheat yield trials at AAFC Beaverlodge.  Stripe was also just observed in wheat plots at the University of Saskatchewan in Saskatoon (Randy Kutcher, personal communication).  Given the appearance of stripe rust in three counties in southern Alberta, at Beaverlodge in the Country of Grande Prairie, and the first observations in the Saskatoon area of Saskatchewan, farmers in these regions should be on the look out for stripe rust in wheat.  Special focus should be on wheat fields seeded to varieties rated as susceptible or moderately susceptible.  These recent observations indicate that Prairie regional sources of inoculum may become more important with further crop and disease development.  

vi. Thus, as of June 29, 2020 the risk of stripe rust appearance from the PNW or from regional sources is low to moderate (Figure 12).  However, some locations may be at an increased stripe rust risk, especially where there were 4-5 reverse trajectory events from the PNW or in Prairie regions where stripe rust has been reported.

2. Texas-Oklahoma corridor

i. Currently, farmers in Texas and Oklahoma have or will soon be finished harvesting their winter wheat crops, and thus no longer represents a significant source of cereal rust inoculum for movement into the Prairie region.


ii. Thus, as of June 29, 2020 the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is nil and scouting for these diseases is not urgent.  

3. Kansas to Nebraska corridor 

i. Currently there appears to be relatively low levels of stripe rust development in the Kansas to Nebraska.  Looking at specific locations in Prairie region and reverse trajectories, only 8 of 29 locations had only 1-2 days each with reverse trajectories originating over the states of Kansas and Nebraska from June 23-29, 2020, with the remaining locations having zero.  Locations with 1-2 days with events included: Gainsborough (2), and Yorkton (1), SK; and one event each for Brandon, Carman, Dauphin, Portage, Russell, and Selkirk, MB.  The remaining locations had no events from June 23-29, 2020 (data not shown).  

ii. Prairie temperatures were warmest in MB and eastern SK and seven day cumulative varied across the prairies (Figure 7).  Average 7 day temperatures continue to be warmest across MB and eastern SK and coolest across most of AB (Figure 7) . The weekly average temperature at Winnipeg (20.8C) was 6C warmer than Grande Prairie.  Cumulative rainfall for the past 7 days was variable (Figure 9). Cumulative 30 day rainfall was greatest across central regions of AB. Rainfall amounts were lower across the southern prairies (Figure 10).

iii. Winter wheat crops are progressing into flowering or are finishing flowering, while Prairie spring wheat development ranges from tillering to booting/head emergence.  

iv. In Kansas the winter wheat crop is rapidly maturing with harvesting occurring in some areas, and thus no longer represents a significant source of rust inoculum.  The Nebraska winter wheat crop has mostly headed and in some areas is starting to turn with harvest 1-2 weeks away.  With the Nebraska winter wheat crop progressing towards maturity and harvest, and given limited reports of disease, this state is becoming less of a potential source of rust inoculum.  

v. Thus, as of June 29, 2020 the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is limited and scouting for these diseases is not urgent (Figure 13).


vi. There continue to be reports of low levels of stripe rust in South Dakota and Wisconsin.  Thus, given the proximity to the Prairie region, these reports serve as a warning that farmers and crop scouts in the central to eastern Prairie region of Canada should be on the look out for stripe rust, especially in winter wheat fields.

4. Rust appearance in the Prairie region
i. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2019, it is recommended to scout winter wheat fields that have resumed growth in spring 2020.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  

ii. Currently, there have been five reports of the initial appearance of stripe rust on Alberta winter wheat on June 5, 16, 19, and 30, 2020 in the Counties of Lethbridge, Cardston, and Forty-Mile in southern Alberta and in the County of Grande Prairie in the Peace Region of Alberta (Figure 2).  On July 2, 2020 there was also an initial report of stripe rust in the Saskatoon region (R. Kutcher, personal communication).  Given the appearance of stripe rust, farmers in these regions should be on the look out for stripe rust in wheat.  Special focus should be on wheat fields seeded to varieties rated as susceptible or moderately susceptible.

5. Read the full report here.  

Prairie Crop Disease Monitoring Network

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of  prairie pathologists working together to support in-field disease management in field crops.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is offered to the public for informational purposes only.  Read the OVERVIEW describing the collaborative nature of this effort and the methods employed.  

Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, June 16-22, 2020

1. Pacific Northwest – There moderate number of reverse wind trajectories that passed over the PNW region and into the prairies.  Locations with the highest number of days with events (3-4) with reverse trajectories from the PNW included: Lethbridge (4) and Olds (3), AB; Regina (3), Saskatoon (3) and Yorkton (3), SK; and Brandon (3) and Dauphin (3), MB.  Of note was the occurrence of 1-2 days with trajectory events that ended up in the Fort Vermilion, Grande Prairie, Manning, and Rycroft areas of the Peace Region of Alberta.  Currently there appears to be relatively low levels of stripe rust development in the PNW, although this may change over the week, although later season (anthesis) fungicide applications may limit further stripe rust development in PNW winter wheat crops.  Temperatures have been in the 15-20C range for most of Manitoba, southeastern Saskatchewan, the Lethbridge area, and the Peace Region.  Other Prairie regions had average temperatures from June 15-21, 2020 of 11 to 15C.  This past week, rainfall amounts were greatest across central regions of SK and eastern MB.  In contrast, limited rainfall occurred in the Grande Prairie region and from Manning to High Level/Fort Vermilion, AB, and in large areas of central to western Manitoba. Winter wheat crops are progressing towards head emergence and flowering, while Prairie spring wheat development ranges from the end of the seedling stage to stem elongation.  There have been reports of stripe rust in western Idaho and on June 16, 2020 from southern Alberta, specifically the County of Lethbridge.  On June 19, 2020 there was a third report in Alberta with the observation of stripe rust in winter wheat yield trials at AAFC Beaverlodge. Given the appearance of stripe rust in the Nobleford area of the County of Lethbridge, and at Beaverlodge in the Country of Grande Prairie, farmers in these regions should be on the look out for stripe rust in wheat.  Special focus should be on wheat fields seeded to varieties rated as susceptible or moderately susceptible.  These recent observations in Alberta indicate that Prairie regional sources of inoculum may become more important with further crop and disease development.  Thus, as of June 22, 2020 the risk of stripe rust appearance from the PNW or from regional sources is low to moderate.  However, some locations may be at an increased stripe rust risk, especially where there were 3-4 reverse trajectory events from the PNW or in Prairie regions where stripe rust has been reported.

2. Texas-Oklahoma corridor – Currently, there is very limited leaf and stripe rust development in this corridor.  Moreover, as the Texas and Oklahoma winter wheat crops continue to be harvested, this region no longer represents a significant source of cereal rust inoculum for movement into the Prairie region.  Thus, as of June 22, 2020 the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is limited and scouting for these diseases is not urgent.  

3. Kansas to Nebraska corridor – Currently there appears to be relatively low levels of stripe rust development in the Kansas to Nebraska.  Looking at specific locations in Prairie region and reverse trajectories, only 10 of 29 locations had only 1-3 days each with reverse trajectories originating over the states of Kansas and Nebraska from June 16-22, 2020, with the remaining locations having zero.  Locations with the highest number of days with events (3) with reverse trajectories from the PNW included: Brandon (3) and Selkirk (3), MB.  Eight locations in Saskatchewan and Manitoba had 1-2 days with events, while the remaining locations had no events from June 16 to 22, 2020 (Table 2).  Temperatures have been in the 15-20C range for most of Manitoba, southeastern Saskatchewan, the Lethbridge area, and the Peace Region.  Other Prairie regions had average temperatures from June 15-21, 2020 of 11 to 15C.  This past week, rainfall amounts were greatest across central regions of SK and eastern MB.  In contrast, limited rainfall occurred in the Grande Prairie region and from Manning to High Level/Fort Vermilion, AB, and in large areas of central to western Manitoba. Winter wheat crops are progressing towards head emergence and flowering, while Prairie spring wheat development ranges from the end of the seedling stage to stem elongation.  Thus, as of June 22, 2020 the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is limited and scouting for these diseases is not urgent.  In Kansas the winter wheat crop is rapidly maturing with harvesting occurring in some areas, and thus no longer represents a significant source of rust inoculum.  The Nebraska winter wheat crop has mostly headed and in some areas is starting to turn with harvest 1-2 weeks away.  With the Nebraska winter wheat crop progressing towards maturity and harvest, and given limited reports of disease, this state is becoming less of a potential source of rust inoculum.  There continue to be reports of low levels of stripe rust in South Dakota and Wisconsin.  Thus, given the proximity to the Prairie region, these reports serve as a warning that farmers and crop scouts in the central to eastern Prairie region of Canada should be on the look out for stripe rust, especially in winter wheat fields.

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2019, it is recommended to scout winter wheat fields that have resumed growth in spring 2020.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there have been three reports of the initial appearance of stripe rust on winter wheat on June 5, 16, and 19, 2020 in the County of Lethbridge in southern Alberta and in the County of Grande Prairie in the Peace Region of Alberta.  Given the appearance of stripe rust in the Counties of Lethbridge and Grande Prairie, farmers in these regions should be on the look out for stripe rust in wheat.  Special focus should be on wheat fields seeded to varieties rated as susceptible or moderately susceptible.

5. Read the full report here.  

Prairie Crop Disease Monitoring Network

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of  prairie pathologists working together to support in-field disease management in field crops.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is offered to the public for informational purposes only.  Read the OVERVIEW describing the collaborative nature of this effort and the methods employed.  

Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, June 9-15, 2020

1. Pacific Northwest – There were a relatively high number of reverse wind trajectories that passed over the PNW region and into the prairies.  Locations with the highest number of days with events (3-4) with reverse trajectories from the PNW included: Beiseker (4), Lethbridge (4), and Olds (3), Provost (3), Rycroft (3), Vegreville (4), Wanham (3), AB; Gainsborough (3), Kindersley (3), Saskatoon (3), and Tisdale (3), SK.  Of note is the occurrence of 3 days with trajectory events that ended up in the Wanham area in the Peace Region of Alberta (Table 1).  Currently there appears to be relatively low levels of stripe rust development in the PNW, although this may change over the few weeks along fungicide applications may limit further stripe rust development in PNW winter wheat crops.  Temperatures have been 2-3C above normal in southern Alberta, and most of Saskatchewan and Manitoba.  In southcentral Alberta to the Peace River region in Alberta, temperatures have been normal to slightly below normal.  Rainfall amounts were greatest in AB and southern/east-central SK, while eastern and southern Alberta, central to western Saskatchewan and most of Manitoba, except the SE corner had minimal amounts of rainfall. Winter wheat crops are progressing towards head emergence with some starting to flower, while there are generally early stages of Prairie spring wheat development ranging from the two leaf to tillering stages.  There have been reports of stripe rust in western Idaho and in the last week from southern Alberta, specifically the County of Lethbridge.  Thus, given the proximity to the Prairie region, these reports serve as a warning that farmers and crop scouts in the western Prairie region of Canada should be on the look out for stripe rust, especially in winter wheat fields in southern Alberta.  These recent observations in southern Alberta indicate that Prairie regional sources of inoculum may become more important with further crop and disease development.  Thus, as of June 15, 2020 the risk of stripe rust appearance from the PNW or from regional sources is low to moderate.  However, locations with 3-4 reverse trajectory events from the PNW or in Prairie regions where stripe rust has been reported (i.e. County of Lethbridge) may be at an increased stripe rust risk, especially for winter wheat crops.

2. Texas-Oklahoma corridor – Currently, there is very limited leaf and stripe rust development in this corridor.  Moreover, as the Texas and Oklahoma winter wheat crops continue to finish maturing and are harvested, this region no longer represents a significant source of cereal rust inoculum for movement into the Prairie region.  In addition, there were a relatively low number of recent wind trajectories from this area for most prairie locations.  Temperatures have been 2-3C above normal in southern Alberta, and most of Saskatchewan and Manitoba.  In southcentral Alberta to the Peace River region in Alberta, temperatures have been normal to slightly below normal.  Rainfall amounts were greatest in AB and southern/east-central SK, while eastern and southern Alberta, central to western Saskatchewan and most of Manitoba, except the SE corner had minimal amounts of rainfall. Winter wheat crops are progressing towards head emergence with some starting to flower, while there are generally early stages of Prairie spring wheat development ranging from the two leaf to tillering stages.  Thus, as of June 15, 2020 the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is limited and scouting for these diseases is not urgent.  

3. Kansas to Nebraska corridor – Currently, there is some stripe rust development in Kansas, while there continue to be reports of stripe rust at low levels in Nebraska.  Moreover, there were a relatively low number of recent wind trajectories from this area for most prairie locations.  Temperatures have been 2-3C above normal in southern Alberta, and most of Saskatchewan and Manitoba.  In southcentral Alberta to the Peace River region in Alberta, temperatures have been normal to slightly below normal.  Rainfall amounts were greatest in AB and southern/east-central SK, while eastern and southern Alberta, central to western Saskatchewan and most of Manitoba, except the SE corner had minimal amounts of rainfall. Winter wheat crops are progressing towards head emergence with some starting to flower, while there are generally early stages of Prairie spring wheat development ranging from the two leaf to tillering stages.  Thus, as of June 15, 2020 the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is limited and scouting for these diseases is not urgent.  However, there continue to be reports of low levels of stripe rust in South Dakota and Wisconsin.  Thus, given the proximity to the Prairie region, these reports serve as a warning that farmers and crop scouts in the central to eastern Prairie region of Canada should be on the look out for stripe rust, especially in winter wheat fields.

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2019, it is recommended to scout winter wheat fields that have resumed growth in spring 2020.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there have been two reports of the initial appearance of stripe rust on winter wheat on June 5 and June 16, 2020 in the County of Lethbridge in southern Alberta.

5. Read the full report here.  

Prairie Crop Disease Monitoring Network - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of  prairie pathologists working together to support in-field disease management in field crops.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is offered to the public for informational purposes only.  Read the OVERVIEW describing the collaborative nature of this effort and the methods employed.  

Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, June 2-8, 2020

1. Pacific Northwest – There were a relatively high number of reverse wind trajectories that passed over the PNW region and into the prairies.  Locations with the highest number of days with events (3-7) with reverse trajectories from the PNW included: Beiseker (4), Lethbridge (7), and Olds, AB (4); Gainsborough (5) and Regina (4), SK; and Brandon (3), Carman (3), Dauphin (4), Russell (3) and Selkirk (3), MB.  Manning, Provost, Rycroft and Wanham, AB, did not have any reverse trajectories originating from the PNW over the period of June 2-8, 2020, with the remaining locations having 1-2 days with events (Table 1).  Currently there appears to be relatively low levels of stripe rust development in the PNW, although this may change over the next week or so.  Temperatures have been relatively cool in the western Prairie regions with somewhat higher temperatures in the central to eastern Prairies.  Dry conditions have occurred in the Peace region, some areas of central and southern Alberta and in southern to eastern Saskatchewan and most areas of Manitoba, except the southeast.  Winter wheat crops are progressing towards flag leaf emergence to booting, while there are generally early stages of Prairie spring wheat development.  Thus, as of June 8, 2020 the risk of stripe rust appearance from the PNW is somewhat limited and scouting for this disease is not urgent.  However, locations with 3-7 reverse trajectory events from the PNW may be at a slightly increased stripe rust risk, especially for winter wheat crops.  As of June 3 and 5, 2020 there have been reports of stripe rust in western Idaho and southern Alberta.  Thus, given the proximity to the Prairie region, these reports serve as a warning that farmers and crop scouts in the western Prairie region of Canada should be on the lookout for stripe rust, especially in winter wheat fields in southern Alberta.

2. Texas-Oklahoma corridor – Currently, there is limited leaf and stripe rust development in this corridor.  Moreover, there were a relatively low number of recent wind trajectories from this area for most prairie locations.  Temperatures have been relatively cool in the western Prairie regions with somewhat higher temperatures in the central to eastern Prairies.  Dry conditions have occurred in the Peace region, some areas of central and southern Alberta and in southern to eastern Saskatchewan and most areas of Manitoba, except the southeast.  Winter wheat crops are progressing towards flag leaf emergence to booting, while there are generally early stages of Prairie spring wheat development.  Thus, as of June 8, 2020 the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is limited and scouting for these diseases is not urgent.  Finally, crops in Texas and Oklahoma are generally at maturity with harvesting occurring in many areas in Texas and Oklahoma, thus this region is of limited concern as a source or rust inoculum.  

3. Kansas to Nebraska corridor – Currently, there is some stripe rust development in Kansas, while there continue to be reports of stripe rust at low levels in Nebraska.  Moreover, there were a relatively low number of recent wind trajectories from this area for most prairie locations.  Temperatures have been relatively cool in the western Prairie regions with somewhat higher temperatures in the central to eastern Prairies.  Dry conditions have occurred in the Peace region, some areas of central and southern Alberta and in southern to eastern Saskatchewan and most areas of Manitoba, except the southeast.  Winter wheat crops are progressing towards flag leaf emergence to booting, while there are early stages of Prairie spring wheat development.  Thus, as of June 8, 2020 the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is limited and scouting for these diseases is not urgent.  However, there have been initial reports of low levels of stripe rust in South Dakota and Wisconsin.  Thus, given the proximity to the Prairie region, these reports serve as a warning that farmers and crop scouts in the central to eastern Prairie region of Canada should be on the lookout for stripe rust, especially in winter wheat fields.

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2019, it is recommended to scout winter wheat fields that have resumed growth in spring 2020.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there has only been one report of stripe rust on winter wheat and this was from southern Alberta on June 5, 2020.

5. Read the full report here.  

Prairie Crop Disease Monitoring Network - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of  prairie pathologists working together to support in-field disease management in field crops.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is offered to the public for informational purposes only.  Read the OVERVIEW describing the collaborative nature of this effort and the methods employed.  

Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, May 25- June 1, 2020

1. Pacific Northwest – There were a relatively high number of reverse wind trajectories that passed over the PNW region and into the prairies.  Locations with the highest number of days with reverse trajectories from the PNW for May 26 to June 1, 2020 included: Beiseker (4), Lethbridge (7), Olds, and Provost, AB (4); and Kindersley, SK (4). However, currently there appears to be limited stripe rust development in the PNW, cool dry conditions over most of the Prairie region, except central Alberta, and early stages of Prairie spring wheat development.  Thus, as of June 1, 2020 the risk of stripe rust appearance from the PNW is limited and scouting for this disease is not urgent.  However, locations with 3-7 reverse trajectory events from the PNW may be at a slightly increased stripe rust risk, especially for winter wheat crops.  As of June 3, 2020 there have been reports of stripe rust in western Idaho.  Thus, given the proximity to the Prairie region these reports serve as a warning that farmers and crop scouts in the western Prairie region of Canada should be on the look out for stripe rust, especially in winter wheat fields in southern Alberta.

2. Texas-Oklahoma corridor – Currently, there is limited leaf and stripe rust development in this corridor.  Moreover, there were a relatively low number of recent wind trajectories from this area for most prairie locations, cool dry conditions over most of the Prairie region, except central Alberta, and early stages of Prairie spring wheat development.  Thus, as of June 1, 2020 the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is limited and scouting for these diseases is not urgent.  Finally, crops in Texas and Oklahoma are at or approaching maturity with harvesting occurring in many areas in Texas and thus this region is of limited concern as a source or rust inoculum.  

3. Kansas to Nebraska corridor – Currently, there is primarily some stripe rust development in Kansas, while we have had the first reports of stripe rust at low levels in Nebraska.  Moreover, there were a relatively low number of recent wind trajectories from this area for most prairie locations, cool dry conditions over most of the Prairie region, except central Alberta, and early stages of Prairie spring wheat development.  Thus, as of June 1, 2020 the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is limited and scouting for these diseases is not urgent.  However, Brandon and Carman, MB had 3 and 2 days, respectively with reverse trajectory events from the Kansas/Nebraska region for May 26 to June 1, 2020, and thus rust risk may be slightly increased for these areas, especially for winter wheat crops.  There are also initial reports of low levels of stripe rust in South Dakota and Wisconsin.  Thus, given the proximity to the Prairie region these reports serve as a warning that farmers and crop scouts in the central to eastern Prairie region of Canada should be on the look out for stripe rust, especially in winter wheat fields.

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2019, it is recommended to scout winter wheat fields that have resumed growth this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no early spring reports of stripe rust on winter wheat.

5. Read the full report here.  

Prairie Crop Disease Monitoring Network - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of  prairie pathologists working together to support in-field disease management in field crops.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is offered to the public for informational purposes only.  Read the OVERVIEW describing the collaborative nature of this effort and the methods employed.  

Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, May 19-25, 2020

1. Pacific Northwest – There were a relatively high number of reverse wind trajectories that passed over the PNW region and into the prairies.  Locations with the highest number of days with reverse trajectories from the PNW included: Beiseker (4), Lethbridge (6), Olds (3), Sedgewick (3), and Vegreville (3), AB; Gainsborough (3), Grenfell (3), Kindersley (3), North Battleford (4), Saskatoon (3), Tisdale (3) and Unity (3), SK; and Brandon (3), MB (Table 1). However, currently there is limited stripe rust development in the PNW, cool dry conditions in some Prairie regions, and early stages of Prairie crop development.  Thus, as of May 25, 2020 the risk of stripe rust appearance from the PNW is limited and scouting for this disease is not urgent.  However, locations with 3-6 reverse trajectory events from the PNW may be at a slightly increased stripe rust risk, especially for winter wheat crops. 

2. Texas-Oklahoma corridor – Currently, there is limited leaf and stripe rust development in this corridor.  Moreover, there were a relatively low number of recent wind trajectories from this area for most prairie locations, cool dry conditions in some Prairie regions, and early stages of Prairie crop development.  Thus, as of May 25, 2020 the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is limited and scouting for these diseases is not urgent.  It should be noted that crops in Texas are at or approaching maturity with harvesting occurring in many areas.  In Oklahoma the wheat crop is progressing towards maturity in most regions of the state except for the northwest, while rust development is generally limited.  Thus, this region will progressively represent a less critical source of cereal rust inoculum for movement into the Prairie region from late May and throughout June 2020.

3. Kansas to Nebraska corridor – Currently, there is some leaf and stripe rust development in Kansas, but not in Nebraska.  Moreover, there were a relatively low number of recent wind trajectories from this area for most prairie locations, cool dry conditions in some Prairie regions, and early stages of Prairie crop development.  Thus, as of May 25, 2020 the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is limited and scouting for these diseases is not urgent. However, there were Prairie locations with 3-6 days with reverse trajectory events from the Kansas/Nebraska region for May 19-25, 2020 and these included: Gainsborough (6), Grenfell (3), Naicam (3), Regina (4), Yorkton (3), and Tisdale (3), SK; Brandon (4), Carman (4), Dauphin (3), Portage (3), Russell (5), and Selkirk (3), MB.  Thus, rust risk may be slightly increased for these areas, especially for winter wheat crops.

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2019, it is recommended to scout winter wheat fields that have resumed growth this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no early spring reports of stripe rust on winter wheat.

5. Read the full report here.  

Prairie Crop Disease Monitoring Network - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of  prairie pathologists working together to support in-field disease management in field crops.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is offered to the public for informational purposes only.  Read the OVERVIEW describing the collaborative nature of this effort and the methods employed.  

Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, May 12-18, 2020

1. Pacific Northwest (PNW) – There were a number of reverse wind trajectories that passed over the PNW region and into the prairies.  However, currently there is limited stripe rust development in the PNW, cool dry Prairie weather conditions, and early stages of Prairie crop development.  Thus, as of May 18, 2020 the risk of stripe rust appearance from the PNW is limited and scouting for this disease is not urgent.  

2. Texas-Nebraska corridor – Currently, there is limited leaf and stripe rust development in this corridor.  Moreover, there were a relatively low number of recent wind trajectories from this area, and cool Prairie weather conditions and early stages of Prairie crop development.  Thus, as of May 18, 2020 the risk of leaf and stripe rust appearance from the Texas-Nebraska corridor is limited and scouting for these diseases is not urgent

3. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2019, it is recommended to scout winter wheat fields that have resumed growth this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no early spring reports of stripe rust on winter wheat.

4. Read the full report here.  

Prairie Crop Disease Monitoring Network - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of  prairie pathologists working together to support in-field disease management in field crops.  

The PCDMN will release a series of weekly Cereal Rust Risk Reports throughout May and June.  Read the OVERVIEW describing the collaborative nature of this effort and the methods employed.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is offered to the public for informational purposes only.

Synopsis for May 5-11, 2020 - Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region

1. Pacific Northwest (PNW) – Even though there were a number of reverse wind trajectories that passed over the PNW region and into the prairies, given limited stripe rust development in the PNW, cool Prairie weather conditions, and early stages of Prairie crop development, as of May 11, 2020, the risk of stripe rust appearance from the PNW is limited and scouting for this disease is not urgent. 

2. Texas-Nebraska corridor – Given limited leaf and stripe rust development in this corridor, a relatively low number of recent wind trajectories from this area, cool Prairie weather conditions, and early stages of Prairie crop development, as of May 11, 2020 the risk of leaf and stripe rust appearance from the Texas-Nebraska corridor is limited and scouting for these diseases is not urgent.

3. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2019, it is recommended to scout winter wheat fields that have resumed growth this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no early spring reports of stripe rust on winter wheat.

4. Read the full report here.  

Prairie Crop Disease Monitoring Network (June 24, 2019; Wk 12) - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of our prairie pathologists who work together to support in-field disease management in field crops.  

In 2019, the PCDMN will release a series of weekly Cereal Rust Risk Reports throughout May and June.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is OFFERED TO THE PUBLIC FOR INFORMATIONAL PURPOSES ONLY. 

Background:  Agriculture and AgriFood Canada (AAFC) and Environment and Climate Change Canada (ECCC) have been working together to study the potential of trajectories for monitoring insect movements since the late 1990s. Trajectory models are used to deliver an early-warning system for the origin and destination of migratory invasive species, such as diamondback moth. In addition, plant pathologists have shown that trajectories can assist with the prediction of plant disease infestations and are also beginning to utilize these same data. An introduction will be presented of efforts to identify wind trajectory events that may bring rust urediniospores into Western Canada from epidemic areas in the central and Pacific northwest (PNW) regions of the USA. Identification of potential events as well as an assessment of epidemic severity from source locations, and prairie weather conditions, will be used to assess the need for prompt targeted crop scouting for at-risk regions of the Canadian Prairies.

Two documents are available from the PCDMN:
•  An introduction to cereal rust risk and wind trajectories from the USA.
• WIND TRAJECTORY AND CEREAL RUST RISK REPORT for June 24, 2019

Summary of wind trajectory and cereal rust risk assessment and the need for in-crop scouting in the Prairie region, June 18-24, 2019:

1. Pacific Northwest – Currently there is limited stripe rust development in the PNW, although there has been a moderate number of recent wind trajectories from the PNW.  Rainfall did occur in SK and some regions of Alberta.  Winter wheat is progressing into heading and beyond, and spring wheat is moving from the stem elongation stage to flag leaf emergence.  Thus, as of June 24, 2019, the risk of stripe rust appearance from the PNW is relatively low and scouting for this disease is not urgent.  

2. Texas-Oklahoma corridor – In general, crops are advancing towards maturity, while in many areas of Texas and Oklahoma crops have been harvested or are being harvested, and thus winter wheat crops in these areas are less of a source of rust inoculum.  There were no recent wind trajectories from this area, while rainfall did occur in SK and some regions of Alberta.  Winter wheat is progressing into heading and beyond, and spring wheat is moving from the stem elongation stage to flag leaf emergence.  Thus, as of June 24, 2019, the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is low and scouting for these diseases is not urgent.  

3. Kansas-Nebraska corridor – Kansas crops are starting to mature with harvesting starting in some regions. In Nebraska, leaf and stripe rust development continues, and thus over the next few weeks this region could act as a significant source of rust inoculum for the Prairie region.  From June 18-24, 2019 there has been a low-moderate number of wind trajectories from this area.  Rainfall did occur in SK and some regions of Alberta, while winter wheat is progressing into heading and beyond, and spring wheat is moving from the stem elongation stage to flag leaf emergence.  Thus, as of June 24, 2019, the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is relatively low and scouting for these diseases is not urgent.  Although further development of rust in Nebraska may increase the risk, the crop will soon start to progress towards maturity and will become less of a source of the cereal rusts.  It should be noted that rust symptoms have been observed in research plots in St. Paul, MN (Cereal Rust Survey, CEREAL-RUST-SURVEY@LISTS.UMN.EDU, Dr. O. Fajolu, USDA-ARS Cereal Disease Lab, June 18, 2019).  Stripe and leaf rust have also been observed in research plots at the South Dakota State University Research Farm, while no rust was observed in commercial fields in southeastern and southcentral regions of the SD (Cereal Rust Survey, CEREAL-RUST-SURVEY@LISTS.UMN.EDU, Dr. E. Byamukama, South Dakota State University, June 18, 2019).

4. Currently, we are not aware of reports of stripe or leaf rust in commercial fields of winter or spring wheat across the Prairie region.

5.  Access the full downloadable report.

Prairie Crop Disease Monitoring Network (June 17, 2019; Wk 11) - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of our prairie pathologists who work together to support in-field disease management in field crops.  

In 2019, the PCDMN will release a series of weekly Cereal Rust Risk Reports throughout May and June.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is OFFERED TO THE PUBLIC FOR INFORMATIONAL PURPOSES ONLY. 

Background:  Agriculture and AgriFood Canada (AAFC) and Environment and Climate Change Canada (ECCC) have been working together to study the potential of trajectories for monitoring insect movements since the late 1990s. Trajectory models are used to deliver an early-warning system for the origin and destination of migratory invasive species, such as diamondback moth. In addition, plant pathologists have shown that trajectories can assist with the prediction of plant disease infestations and are also beginning to utilize these same data. An introduction will be presented of efforts to identify wind trajectory events that may bring rust urediniospores into Western Canada from epidemic areas in the central and Pacific northwest (PNW) regions of the USA. Identification of potential events as well as an assessment of epidemic severity from source locations, and prairie weather conditions, will be used to assess the need for prompt targeted crop scouting for at-risk regions of the Canadian Prairies.

Two documents are available from the PCDMN:
•  An introduction to cereal rust risk and wind trajectories from the USA.
• WIND TRAJECTORY AND CEREAL RUST RISK REPORT for June 17, 2019

Summary of wind trajectory and cereal rust risk assessment and the need for in-crop scouting in the Prairie region, June 11-17, 2019:

1. Pacific Northwest – Currently there is limited stripe rust development in the PNW, a low number of recent wind trajectories from the PNW, and relatively dry Prairie weather conditions, while winter wheat is progressing into heading and beyond, and spring wheat is moving into the stem elongation stage.  Thus, as of June 17, 2019, the risk of stripe rust appearance from the PNW is relatively low and scouting for this disease is not urgent.

2. Texas-Oklahoma corridor – In general, crops are advancing towards maturity, while in many areas of Texas harvesting has been completed, and thus winter wheat crops in these areas will become less of a source of rust inoculum.  There has been a limited number of recent wind trajectories from this area, relatively dry Prairie weather conditions, while winter wheat is progressing into heading and beyond, and spring wheat is moving into the stem elongation stage.  Thus, as of June 17, 2019, the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is low and scouting for these diseases is not urgent.  

3. Kansas-Nebraska corridor – Leaf and stripe rust development in winter wheat continues in Kansas, although the winter crop is starting to turn colour in many regions.  Although rusts have only been recently reported in Nebraska, levels are on the rise, and thus over the next few weeks this region could act as a significant source of rust inoculum for the Prairie region.  From June 11-17, 2019 there has been a low number of wind trajectories from this area.  In general, weather conditions have been relatively dry across the Prairies, while winter wheat is progressing into heading and beyond, and spring wheat is moving into the stem elongation stage.  Thus, as of June 17, 2019, the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is relatively low and scouting for these diseases is not urgent; however, further development of rust Nebraska may increase the risk.  

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2018 it is recommended to scout winter wheat fields this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no reports of stripe rust in commercial fields of winter or spring wheat across the Prairie region.

5.  Access the full downloadable report.

Prairie Crop Disease Monitoring Network (June 10, 2019; Wk 10) - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of our prairie pathologists who work together to support in-field disease management in field crops.  

In 2019, the PCDMN will release a series of weekly Cereal Rust Risk Reports throughout May and June.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is OFFERED TO THE PUBLIC FOR INFORMATIONAL PURPOSES ONLY. 

Background:  Agriculture and AgriFood Canada (AAFC) and Environment and Climate Change Canada (ECCC) have been working together to study the potential of trajectories for monitoring insect movements since the late 1990s. Trajectory models are used to deliver an early-warning system for the origin and destination of migratory invasive species, such as diamondback moth. In addition, plant pathologists have shown that trajectories can assist with the prediction of plant disease infestations and are also beginning to utilize these same data. An introduction will be presented of efforts to identify wind trajectory events that may bring rust urediniospores into Western Canada from epidemic areas in the central and Pacific northwest (PNW) regions of the USA. Identification of potential events as well as an assessment of epidemic severity from source locations, and prairie weather conditions, will be used to assess the need for prompt targeted crop scouting for at-risk regions of the Canadian Prairies.

This week, two documents are available from the PCDMN:
•  An introduction to cereal rust risk and wind trajectories from the USA.
• WIND TRAJECTORY AND CEREAL RUST RISK REPORT for June 10, 2019

Summary of wind trajectory and cereal rust risk assessment and the need for in-crop scouting in the Prairie region, June 4-10, 2019:

1. Pacific Northwest – Currently there is limited stripe rust development in the PNW, a moderate-high number of recent wind trajectories from the PNW, relatively dry Prairie weather conditions, and generally early stages of Prairie crop development, especially in spring cereals.  Thus, as of June 10, 2019, the risk of stripe rust appearance from the PNW is relatively low and scouting for this disease is not urgent.  

2. Texas-Oklahoma corridor –In general, crops are advancing towards maturity, while in many areas of Texas harvesting has been completed, and thus will become less of a source of rust inoculum.  There has been a limited number of recent wind trajectories from this area, relatively dry Prairie weather conditions, and generally early stages of Prairie spring crop development.  Thus, as of June 10, 2019, the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is low and scouting for these diseases is not urgent.  

3. Kansas-Nebraska corridor –Leaf and stripe rust development in winter wheat continues in Kansas, although the winter crop is starting to turn colour in some regions.  Although rusts have only been recently reported in Nebraska, levels are on the rise, and thus over the next few weeks this region could act as a significant source of rust inoculum for the Prairie region.  From June 4-10, 2019 there has been a low-moderate number of wind trajectories from this area.  In general, weather conditions have been relatively dry across the Prairies with generally early stages of Prairie crop development depending on the region.  Thus, as of June 10, 2019, the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is relatively low and scouting for these diseases is not urgent; however, further development of rust in these regions, especially Nebraska, may increase the risk.  

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2018, it is recommended to scout winter wheat fields this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no reports of stripe rust in commercial fields of winter or spring wheat across the Prairie region.

5.  Access the full downloadable report.

Prairie Crop Disease Monitoring Network (June 3, 2019; Wk 09) - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of our prairie pathologists who work together to support in-field disease management in field crops.  

In 2019, the PCDMN will release a series of weekly Cereal Rust Risk Reports throughout May and June.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is OFFERED TO THE PUBLIC FOR INFORMATIONAL PURPOSES ONLY. 

Background:  Agriculture and AgriFood Canada (AAFC) and Environment and Climate Change Canada (ECCC) have been working together to study the potential of trajectories for monitoring insect movements since the late 1990s. Trajectory models are used to deliver an early-warning system for the origin and destination of migratory invasive species, such as diamondback moth. In addition, plant pathologists have shown that trajectories can assist with the prediction of plant disease infestations and are also beginning to utilize these same data. An introduction will be presented of efforts to identify wind trajectory events that may bring rust urediniospores into Western Canada from epidemic areas in the central and Pacific northwest (PNW) regions of the USA. Identification of potential events as well as an assessment of epidemic severity from source locations, and prairie weather conditions, will be used to assess the need for prompt targeted crop scouting for at-risk regions of the Canadian Prairies.

This week, two documents are available from the PCDMN:
•  An introduction to cereal rust risk and wind trajectories from the USA.
• WIND TRAJECTORY AND CEREAL RUST RISK REPORT for June 3, 2019

Summary of wind trajectory and cereal rust risk assessment and the need for in-crop scouting in the Prairie region, May 28 – June 3, 2019:

1. Pacific Northwest – Currently there is limited stripe rust development in the PNW, a low-moderate number of recent wind trajectories from the PNW, cool and relatively dry Prairie weather conditions, and generally early stages of Prairie crop development, especially in spring cereals.  Thus, as of June 3, 2019, the risk of stripe rust appearance from the PNW is limited and scouting for this disease is not urgent.  

2. Texas-Oklahoma corridor – In general, crops are advancing towards maturity and thus will become less of a source of rust inoculum.  There have been no recent wind trajectories from this area, cool and relatively dry Prairie weather conditions, and generally early stages of Prairie spring crop development.  Thus, as of June 3, 2019, the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is low and scouting for these diseases is not urgent.  

3. Kansas-Nebraska corridor – Although leaf and stripe rust development continues in Kansas with a recent report of stripe rust in Nebraska, it is at low-moderate levels, although there have been reports of elevated levels in regions of Kansas.  There have been no recent wind trajectories from this area, cool and relatively dry Prairie weather conditions, and generally early stages of Prairie crop development.  Thus, as of June 3, 2019, the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is low and scouting for these diseases is not urgent, but further development of rust in these regions may increase the risk.  

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2018, it is recommended to scout winter wheat fields that have resumed growth this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no early spring reports of stripe rust on commercial fields of winter wheat in the prairie region.

5.  Access the full downloadable report.

Prairie Crop Disease Monitoring Network (May 30, 2019; Wk 08) - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of our prairie pathologists who work together to support in-field disease management in field crops.  

In 2019, the PCDMN will release a series of weekly Cereal Rust Risk Reports throughout May and June.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is OFFERED TO THE PUBLIC FOR INFORMATIONAL PURPOSES ONLY. 

Background:  Agriculture and AgriFood Canada (AAFC) and Environment and Climate Change Canada (ECCC) have been working together to study the potential of trajectories for monitoring insect movements since the late 1990s. Trajectory models are used to deliver an early-warning system for the origin and destination of migratory invasive species, such as diamondback moth. In addition, plant pathologists have shown that trajectories can assist with the prediction of plant disease infestations and are also beginning to utilize these same data. An introduction will be presented of efforts to identify wind trajectory events that may bring rust urediniospores into Western Canada from epidemic areas in the central and Pacific northwest (PNW) regions of the USA. Identification of potential events as well as an assessment of epidemic severity from source locations, and prairie weather conditions, will be used to assess the need for prompt targeted crop scouting for at-risk regions of the Canadian Prairies.

This week, two documents are available from the PCDMN:
•  An introduction to cereal rust risk and wind trajectories from the USA.
• WIND TRAJECTORY AND CEREAL RUST RISK REPORT for May 27, 2019

Synopsis of May 21-27, 2019, Weekly Cereal Rust Risk Report: 

1. Pacific Northwest – Given limited stripe rust development in the PNW, a low number of recent wind trajectories from the PNW, cool and relatively dry Prairie weather conditions, and generally early stages of Prairie crop development, as of May 27, 2019, the risk of stripe rust appearance from the PNW is limited and scouting for this disease is not urgent.

2. Texas-Oklahoma corridor – Although leaf and stripe rust development continues in this corridor, especially Oklahoma, the disease is mainly affecting the lower canopy at generally low levels.  In addition, crops are advancing towards maturity and thus will become less of a source of rust inoculum.  There have been a low number of recent wind trajectories from this area, cool and relatively dry Prairie weather conditions, and generally early stages of Prairie crop development.  Thus, as of May 27, 2019 the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is low and scouting for these diseases is not urgent.

3. Kansas-Nebraska corridor – Although leaf and stripe rust development continues in Kansas, it is at low-moderate levels and mainly in the middle portions of crop canopies.  There have been a low-moderate number of recent wind trajectories from this area, cool and relatively dry Prairie weather conditions, and generally early stages of Prairie crop development.  Thus, as of May 27, 2019 the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is low and scouting for these diseases is not urgent, but further development of rust in these regions may increase the risk. 

4. Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2018, it is recommended to scout winter wheat fields that have resumed growth this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no early spring reports of stripe rust on winter wheat.

5.  Access the full downloadable report.

Prairie Crop Disease Monitoring Network (May 23, 2019; Wk 07) - Turkington

The Prairie Crop Disease Monitoring Network (PCDMN) represents the combined effort of our prairie pathologists who work together to support in-field disease management in field crops.  

In 2019, the PCDMN will release a series of weekly Cereal Rust Risk Reports throughout May and June.  Information related to trajectory events based on forecast and diagnostic wind fields and cereal rust risk is experimental, and is OFFERED TO THE PUBLIC FOR INFORMATIONAL PURPOSES ONLY. 

Background:  Agriculture and AgriFood Canada (AAFC) and Environment and Climate Change Canada (ECCC) have been working together to study the potential of trajectories for monitoring insect movements since the late 1990s. Trajectory models are used to deliver an early-warning system for the origin and destination of migratory invasive species, such as diamondback moth. In addition, plant pathologists have shown that trajectories can assist with the prediction of plant disease infestations and are also beginning to utilize these same data. An introduction will be presented of efforts to identify wind trajectory events that may bring rust urediniospores into Western Canada from epidemic areas in the central and Pacific northwest (PNW) regions of the USA. Identification of potential events as well as an assessment of epidemic severity from source locations, and prairie weather conditions, will be used to assess the need for prompt targeted crop scouting for at-risk regions of the Canadian Prairies.

This week, two documents are available from the PCDMN:
•  An introduction to cereal rust risk and wind trajectories from the USA.
• WIND TRAJECTORY AND CEREAL RUST RISK REPORT for May 21, 2019

Synopsis of May 21, 2019, Weekly Cereal Rust Risk Report: 
Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, May 21, 2019.

1.  Pacific Northwest – Given limited stripe rust development in the PNW, a low number of recent wind trajectories from the PNW, cool and relatively dry Prairie weather conditions, and early stages of Prairie crop development, as of May 21, 2019, the risk of stripe rust appearance from the PNW is limited and scouting for this disease is not urgent.  

2.  Texas-Oklahoma corridor – Although leaf and stripe rust development continues in this corridor, especially Oklahoma, the disease is mainly affecting the lower canopy at generally low levels.  In addition, crops are advancing towards maturity and thus will become less of a source of rust inoculum.  There have been a low number of recent wind trajectories from this area, cool and relatively dry Prairie weather conditions, and early stages of Prairie crop development.  Thus, as of May 21, 2019 the risk of leaf and stripe rust appearance from the Texas-Oklahoma corridor is low and scouting for these diseases is not urgent.  

3.  Kansas-Nebraska corridor – Although leaf and stripe rust development continues in this corridor, it is at low-moderate levels and mainly in the middle portions of crop canopies, recent moisture conditions may promote further development.  There have been a low number of recent wind trajectories from this area, cool and relatively dry Prairie weather conditions, and early stages of Prairie crop development.  Thus, as of May 21, 2019 the risk of leaf and stripe rust appearance from the Kansas-Nebraska corridor is low and scouting for these diseases is not urgent, but further development of rust in these regions may increase the risk.  

4.  Where farmers or consultants noticed stripe rust development on winter wheat in the fall of 2018, it is recommended to scout winter wheat fields that have resumed growth this spring.  Scouting is especially critical where the variety being grown is susceptible to stripe rust.  Currently, there are no early spring reports of stripe rust on winter wheat.

5.  Access the full downloadable report.