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Showing posts with label Grasshopper. Show all posts
Showing posts with label Grasshopper. Show all posts
Friday, 10 July 2020
Weekly Update links to the NEW website
Click each topic below to access the entire WEEKLY UPDATE (June 9, 2020 for Week 11) over at the NEW WEBSITE!
Friday, 3 July 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of June 28, 2020, the grasshopper model estimates that hatch is nearly complete (Table 1). The prairie average, is 77% (71% last week). The majority of the nymphal population is predicted to be in the first to third instars (Table 1; Fig. 1). This week, 5th instar nymphs are predicted to occur in some locations (Fig. 1). Across the prairies, populations are predicted to be 21, 22, 21, 23, 11 and 2% in egg, first, second, third, fourth and 5th instar stages, respectively (Table 1).
Table 1. Results of grasshopper simulation (Melanoplus sanguinipes) development as of June 28, 2020.
Warmer conditions across southern regions of the prairies should result in rapid development of 1st to 3rd nymphs (Table 1). This week 5th instar nymphs are predicted to appear at Regina, Brandon and Winnipeg (Table 1). The two graphs compare development for Saskatoon (Fig. 2) and Winnipeg (Fig. 3). Grasshopper populations near Saskatoon are predominantly in the 2nd and 3rd instars (Fig. 2) while populations near Winnipeg are expected to be primarily 3rd and 4th instars (Fig. 3).
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
As of June 28, 2020, the grasshopper model estimates that hatch is nearly complete (Table 1). The prairie average, is 77% (71% last week). The majority of the nymphal population is predicted to be in the first to third instars (Table 1; Fig. 1). This week, 5th instar nymphs are predicted to occur in some locations (Fig. 1). Across the prairies, populations are predicted to be 21, 22, 21, 23, 11 and 2% in egg, first, second, third, fourth and 5th instar stages, respectively (Table 1).
Table 1. Results of grasshopper simulation (Melanoplus sanguinipes) development as of June 28, 2020.
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| Figure 1. Predicted average instar stages of grasshopper (Melanoplus sanguinipes) populations across the Canadian prairies (as of June 28, 2020). |
Warmer conditions across southern regions of the prairies should result in rapid development of 1st to 3rd nymphs (Table 1). This week 5th instar nymphs are predicted to appear at Regina, Brandon and Winnipeg (Table 1). The two graphs compare development for Saskatoon (Fig. 2) and Winnipeg (Fig. 3). Grasshopper populations near Saskatoon are predominantly in the 2nd and 3rd instars (Fig. 2) while populations near Winnipeg are expected to be primarily 3rd and 4th instars (Fig. 3).
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| Figure 2. Predicted grasshopper (Melanuplus sanguinipes) phenology at Saskatoon SK. Values are based on model simulations (April 1-June 28, 2020). |
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| Figure 3. Predicted grasshopper (Melanuplus sanguinipes) phenology at Winnipeg MB. Values are based on model simulations (April 1-June 28, 2020). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Thursday, 25 June 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of June 21, 2020, the grasshopper model estimates that hatch varies between 15.7 % at Lacombe to more than 95 % at Winnipeg and Regina (Table 1). The prairie average is 71 % (34 % last week) and well above the long term average of 25 % (10 % last week) (Fig. 1). Across the prairies, populations are predicted to be 22, 20, 29, 24 and 5 % in egg, first, second, third, and fourth instars, respectively (Table 1). Warmer conditions across southern regions of the prairies should result in rapid development of first and second instar nymphs (Fig. 2). This will result in most populations consisting of third instar nymphs within a relatively short period of time (Fig. 3).
Table 1. Predictive model output estimates for Melanoplus sanguinipes development (% of total population for each location) at selected sites across the Canadian prairie as of June 21, 2020.
The two graphs below compare grasshopper development at Saskatoon and Winnipeg. Though both locations are predicted to have first to fourth instar nymphs, grasshopper populations near Saskatoon are expected to be predominantly in the first instar and populations near Winnipeg may consist mostly of third instars.
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
As of June 21, 2020, the grasshopper model estimates that hatch varies between 15.7 % at Lacombe to more than 95 % at Winnipeg and Regina (Table 1). The prairie average is 71 % (34 % last week) and well above the long term average of 25 % (10 % last week) (Fig. 1). Across the prairies, populations are predicted to be 22, 20, 29, 24 and 5 % in egg, first, second, third, and fourth instars, respectively (Table 1). Warmer conditions across southern regions of the prairies should result in rapid development of first and second instar nymphs (Fig. 2). This will result in most populations consisting of third instar nymphs within a relatively short period of time (Fig. 3).
Table 1. Predictive model output estimates for Melanoplus sanguinipes development (% of total population for each location) at selected sites across the Canadian prairie as of June 21, 2020.
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| Figure 1. Grasshopper hatch (%) based on model simulations using current environmental conditions (blue bars) compared to long-term normal (red bars) as of June 21, 2020. *LTN = long term climate normals, used for comparison of current year development (OBS) |
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| Figure 2. Predicted grasshopper (Melanoplus sanguinipes) development across the Canadian prairies (as of June 21, 2020). |
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| Figure 3. Predicted percent of grasshopper (Melanoplus sanguinipes) population at third instar stage across the Canadian prairies (as of June 21, 2020). |
The two graphs below compare grasshopper development at Saskatoon and Winnipeg. Though both locations are predicted to have first to fourth instar nymphs, grasshopper populations near Saskatoon are expected to be predominantly in the first instar and populations near Winnipeg may consist mostly of third instars.
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| Figure 4. Predicted grasshopper (Melanuplus sanguinipes) phenology at Saskatoon SK. Values are based on model simulations (April 1-June 21, 2020). |
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| Figure 5. Predicted grasshopper (Melanuplus sanguinipes) phenology at Winnipeg MB. Values are based on model simulations (April 1-June 21, 2020). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Friday, 19 June 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of June 14, 2020, the simulation estimates that hatch varies between 14.5% at Grande Prairie and Lacombe to more than 85% at Winnipeg and Regina (Table 1; Fig. 1). The prairie average, is 34% (20% last week) and well above the long term average of 10% (4.5% last week) for this point in the growing season (Fig. 1). Across the prairies, populations are predicted to be 65, 18, 11 and 4% in egg, first, second, and third instars, respectively (Table 1).
Table 1. Predictive model output estimates for Melanoplus sanguinipes development (% of total population for each location) at selected sites across the Canadian prairie as of June 14, 2020.
Grasshopper hatch is greatest in across the southern prairies; areas bound within the black line in the map below are those where 50% or more of eggs have hatched, according to the simulation model (Fig. 2).
First instar grasshoppers are predicted to be present across the prairies, with first occurrence of hatchlings near Edmonton and southern Peace River region in the past week (Fig. 3). Warmer conditions across southern regions of the prairies should result in appearance of third instar nymphs (Fig. 4).
The two graphs compare development for Regina and Saskatoon. The graphs illustrate that grasshopper populations near Saskatoon are predominantly in the first instar with relatively few grasshoppers in the second and third instars (Fig. 5). Populations near Regina may be expected to have grasshoppers nymphs in first to fourth instar stages of development (Fig. 6).
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
As of June 14, 2020, the simulation estimates that hatch varies between 14.5% at Grande Prairie and Lacombe to more than 85% at Winnipeg and Regina (Table 1; Fig. 1). The prairie average, is 34% (20% last week) and well above the long term average of 10% (4.5% last week) for this point in the growing season (Fig. 1). Across the prairies, populations are predicted to be 65, 18, 11 and 4% in egg, first, second, and third instars, respectively (Table 1).
Table 1. Predictive model output estimates for Melanoplus sanguinipes development (% of total population for each location) at selected sites across the Canadian prairie as of June 14, 2020.
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| Figure 1. Grasshopper hatch (%) based on model simulations using current environmental conditions (blue bars) compared to long-term normal (red bars) as of June 14, 2020. *LTN = long term climate normals, used for comparison of current year development (OBS) |
Grasshopper hatch is greatest in across the southern prairies; areas bound within the black line in the map below are those where 50% or more of eggs have hatched, according to the simulation model (Fig. 2).
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| Figure 2. Predicted percent of grasshopper (Melanoplus sanguinipes) population at hatching stage across the Canadian prairies (as of June 14, 2020). |
First instar grasshoppers are predicted to be present across the prairies, with first occurrence of hatchlings near Edmonton and southern Peace River region in the past week (Fig. 3). Warmer conditions across southern regions of the prairies should result in appearance of third instar nymphs (Fig. 4).
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| Figure 3. Predicted percent of grasshopper (Melanoplus sanguinipes) population at first instar stage across the Canadian prairies (as of June 14, 2020). |
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| Figure 4. Predicted percent of grasshopper (Melanoplus sanguinipes) population at third instar stage across the Canadian prairies (as of June 14, 2020). |
The two graphs compare development for Regina and Saskatoon. The graphs illustrate that grasshopper populations near Saskatoon are predominantly in the first instar with relatively few grasshoppers in the second and third instars (Fig. 5). Populations near Regina may be expected to have grasshoppers nymphs in first to fourth instar stages of development (Fig. 6).
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| Figure 5. Predicted grasshopper (Melanuplus sanguinipes) phenology at Saskatoon SK. Values are based on model simulations (April 1-June 14, 2020). |
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| Figure 6. Predicted grasshopper (Melanuplus sanguinipes) phenology at Regina SK. Values are based on model simulations (April 1-June 14, 2020). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Friday, 12 June 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of June 7, 2020, predicted embryonic development was 82% (78% last week) and is 6% greater than long term average values. The simulation estimates that hatch is well underway and development of nymphs was greater than average for all 8 locations that are listed in Table 1. The prairie average for nymph development is currently estimated at 20% and is well above the long term average of 4.5% (Fig. 1). Average nymph development last week was estimated to be 7%.
Table 1. Predictive model output estimates for Melanoplus sanguinipes development (% of total population for each location) at selected sites across the Canadian prairie as of June 7, 2020.
Grasshopper hatch is predicted to be greatest across the southern prairies at this time (Fig. 2). Areas bound within the black line in the map illustrating hatch of the migratory grasshopper (M. sanguinipes) are areas where the predicted hatch is 35% or greater (Fig. 2). This region includes most of south and central Saskatchewan (Fig. 2).
The two graphs compare development of grasshoppers in Regina (Fig. 3) and Saskatoon (Fig. 4). Model output indicates that 2nd instar nymphs may be present at Brandon, Lethbridge, Regina, Saskatoon and Winnipeg (Table 1). Third instar grasshoppers are predicted for Brandon, Regina and Winnipeg (Table 1).
As of June 7, 2020, predicted embryonic development was 82% (78% last week) and is 6% greater than long term average values. The simulation estimates that hatch is well underway and development of nymphs was greater than average for all 8 locations that are listed in Table 1. The prairie average for nymph development is currently estimated at 20% and is well above the long term average of 4.5% (Fig. 1). Average nymph development last week was estimated to be 7%.
Table 1. Predictive model output estimates for Melanoplus sanguinipes development (% of total population for each location) at selected sites across the Canadian prairie as of June 7, 2020.
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| Figure 1. Grasshopper hatch (%) based on model simulations using current environmental conditions (blue bars) compared to long-term normal (red bars) as of June 7, 2020. *LTN = long term climate normals, used for comparison of current year development (OBS) |
Grasshopper hatch is predicted to be greatest across the southern prairies at this time (Fig. 2). Areas bound within the black line in the map illustrating hatch of the migratory grasshopper (M. sanguinipes) are areas where the predicted hatch is 35% or greater (Fig. 2). This region includes most of south and central Saskatchewan (Fig. 2).
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| Figure 2. Predicted percent of grasshopper (Melanoplus sanguinipes) population at hatching stage across the Canadian prairies (as of June 7, 2020). |
The two graphs compare development of grasshoppers in Regina (Fig. 3) and Saskatoon (Fig. 4). Model output indicates that 2nd instar nymphs may be present at Brandon, Lethbridge, Regina, Saskatoon and Winnipeg (Table 1). Third instar grasshoppers are predicted for Brandon, Regina and Winnipeg (Table 1).
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| Figure 3. Predicted grasshopper (Melanuplus sanguinipes) phenology at Regina SK. Values are based on model simulations (April 1-June 7, 2020). |
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| Figure 4. Predicted grasshopper (Melanuplus sanguinipes) phenology at Saskatoon SK. Values are based on model simulations (April 1-June 7, 2020). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Thursday, 4 June 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of May 31, 2020, predicted embryonic development was 78% compared to 73% last week (Table 1). Grasshopper egg development is currently 8% greater than long term average values (Fig. 1).
Table 1. Predictive model output estimates for Melanoplus sanguinipes populations at selected sites across the Canadian prairie as of May 31, 2020.
This week, the simulation estimates that hatch is underway (Fig. 2). The prairie average for hatch, is 7% (compared to 3% last week). Grasshopper hatch should be greatest in across the southern prairies at this time, based on the phenology model (Fig. 2). This includes most of south and central Saskatchewan (Fig. 2).
As of May 31, 2020, predicted embryonic development was 78% compared to 73% last week (Table 1). Grasshopper egg development is currently 8% greater than long term average values (Fig. 1).
Table 1. Predictive model output estimates for Melanoplus sanguinipes populations at selected sites across the Canadian prairie as of May 31, 2020.
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| Figure 1. Grasshopper hatch (%) based on model simulations using current environmental conditions (blue bars) compared to long-term normal (red bars) as of May 31, 2020. *LTN = long term climate normals, used for comparison of current year development (OBS) |
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| Figure 2. Predicted percent of grasshopper (Melanoplus sanguinipes) population at hatching stage across the Canadian prairies (as of May 31, 2020). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Thursday, 28 May 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of May 25, 2020, predicted embryonic development (Fig. 1) was 73% (66% last week) and is 5% higher than long term average values. Development is greatest in a region extending from Winnipeg to Saskatoon to Lethbridge (Fig. 1, Table 1).
This week, initial hatch is predicted to occur across most of the southern prairies (Fig. 2, Table 1). The simulation estimates that the hatch, based on the prairie average, is 2.9%. Hatch of grasshopper nymphs was predicted to be most advanced in the region extending from Regina to the U.S. border.
Table 1. Predictive model output estimates for M. sanguinipes at selected sites across the Canadian prairies (as of May 25, 2020).
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
As of May 25, 2020, predicted embryonic development (Fig. 1) was 73% (66% last week) and is 5% higher than long term average values. Development is greatest in a region extending from Winnipeg to Saskatoon to Lethbridge (Fig. 1, Table 1).
This week, initial hatch is predicted to occur across most of the southern prairies (Fig. 2, Table 1). The simulation estimates that the hatch, based on the prairie average, is 2.9%. Hatch of grasshopper nymphs was predicted to be most advanced in the region extending from Regina to the U.S. border.
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| Figure 1. Grasshopper embryological development (%) based on model simulations using current environmental conditions (as of May 25, 2020). |
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| Figure 2. Predicted percent of grasshopper (Melanoplus sanguinipes) population at hatching stage across the Canadian prairies (as of May 25, 2020). |
Table 1. Predictive model output estimates for M. sanguinipes at selected sites across the Canadian prairies (as of May 25, 2020).
Friday, 22 May 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of May 18, 2020, predicted embryonic development was 66% and is similar to long term average values. Development was greatest in a region from Regina to Saskatoon and southwest to Lethbridge.
Embryonic development at Winnipeg, Brandon and Grande Prairie is expected to be seven to ten days slower than for Saskatoon, Swift Current and Lethbridge (Fig. 2). Based on these locations, Winnipeg (Fig. 2) was the only site with embryonic development predicted to be slower than long term average (Fig. 3).
This week initial hatch is predicted to occur in southern Alberta (Fig. 4). Across the prairies, results indicated that eggs should begin to hatch during the next two weeks (Fig. 4).
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
As of May 18, 2020, predicted embryonic development was 66% and is similar to long term average values. Development was greatest in a region from Regina to Saskatoon and southwest to Lethbridge.
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| Figure 1. Grasshopper embryological development (%) based on model simulations using current environmental conditions (May 18, 2020). |
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| Figure 2. Grasshopper embryological development (%) based on model simulations using current environmental conditions (as of May 18, 2020) for sites across the Canadian prairies. |
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| Figure 3. Grasshopper embryological development (%) based on model simulations using current environmental conditions (blue bars) compared to long-term normal (red bars) as of May 18, 2020. *LTN = long term climate normals, used for comparison of current year development (OBS) |
This week initial hatch is predicted to occur in southern Alberta (Fig. 4). Across the prairies, results indicated that eggs should begin to hatch during the next two weeks (Fig. 4).
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| Figure 4. Predicted percent of grasshopper (Melanoplus sanguinipes) population at first instar stage across the Canadian prairies (as of May 18, 2020). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Friday, 15 May 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – As of this week, average embryonic development is 62% (59.5% last week). Development continues to be greatest across Saskatchewan and Alberta (Table 1; Fig. 1).
Table 1. Predicted percent embryonic development of Melanoplus sanguinipes populations at selected sites across the Canadian prairies (as of May 11, 2020).
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network (newly updated). Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Table 1. Predicted percent embryonic development of Melanoplus sanguinipes populations at selected sites across the Canadian prairies (as of May 11, 2020).
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| Figure 1. Grasshopper embryological development (%) based on model simulations using current environmental conditions (as of May 11, 2020). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network (newly updated). Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Friday, 8 May 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of May 4, 2020, grasshopper embryonic development is marginally ahead of long term normals. Development has been greatest across Saskatchewan and Alberta (Table 1, Fig. 1).
Table 1. Predicted percent embryonic development of M. sanguinipes populations at selected sites across the Canadian prairies as of May 4, 2020.
Reminder - The Prairie Pest Monitoring Network's 2020 Grasshopper Forecast Map was released last week (Fig. 2) in the 2019-2020 Risk and Forecast Maps. Spring temperatures, soil moisture conditions, and precipitation all have an impact on survival of overwintered grasshopper eggs. Growers in areas highlighted orange or red in the map below should be vigilant this spring.
As of May 4, 2020, grasshopper embryonic development is marginally ahead of long term normals. Development has been greatest across Saskatchewan and Alberta (Table 1, Fig. 1).
Table 1. Predicted percent embryonic development of M. sanguinipes populations at selected sites across the Canadian prairies as of May 4, 2020.
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| Figure 1. Grasshopper embryological development (%) based on model simulations using current environmental conditions (as of May 4, 2020). |
Reminder - The Prairie Pest Monitoring Network's 2020 Grasshopper Forecast Map was released last week (Fig. 2) in the 2019-2020 Risk and Forecast Maps. Spring temperatures, soil moisture conditions, and precipitation all have an impact on survival of overwintered grasshopper eggs. Growers in areas highlighted orange or red in the map below should be vigilant this spring.
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| Figure 2. Grasshopper forecast map (M. sanguinipes) for 2020 growing season (released January 2020). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" (Philip et al. 2018) as an English-enhanced or French-enhanced version.
Thursday, 30 April 2020
Predicted grasshopper development
Grasshopper Simulation Model Output – The grasshopper simulation model will be used to monitor grasshopper development across the prairies. Weekly temperature data collected across the prairies is incorporated into the simulation model which calculates estimates of grasshopper development stages based on biological parameters for Melanoplus sanguinipes (Migratory grasshopper).
As of April 26, 2020....Stay tuned - phenology models will be reposted.
Reminder - The Prairie Pest Monitoring Network's 2020 Grasshopper Forecast Map was released last week (Fig. 4) in the 2019-2020 Risk and Forecast Maps. Spring temperatures, soil moisture conditions, and precipitation all have an impact on survival of overwintered grasshopper eggs. Growers in areas highlighted orange or red in the map below should be vigilant this spring.
As of April 26, 2020....Stay tuned - phenology models will be reposted.
Reminder - The Prairie Pest Monitoring Network's 2020 Grasshopper Forecast Map was released last week (Fig. 4) in the 2019-2020 Risk and Forecast Maps. Spring temperatures, soil moisture conditions, and precipitation all have an impact on survival of overwintered grasshopper eggs. Growers in areas highlighted orange or red in the map below should be vigilant this spring.
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| Figure 4. Grasshopper forecast map (M. sanguinipes) for 2020 growing season. |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" as an English-enhanced or French-enhanced version.
Friday, 16 August 2019
Predicted grasshopper development (August 15, 2019; Wk 19)
Grasshopper Simulation Model Output –
Grasshopper development is progressing and populations are primarily in the adult stage (Fig. 1). Based on model runs, approximately 65% of the population should be in the adult stage (50% last week). Grasshopper development continues to be slower than average development. Based on climate data, 80% of the population would be expected to be in adult stage. Model output indicates that oviposition has begun in southern areas prairies (Fig. 2).
The Insect of the Week's Doppelganger featured GRASSHOPPERS for Week 14!! Check out the excellent nymph photos to help your in-field scouting!
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" which is available as a free downloadable document in either an English-enhanced or French-enhanced version.
Grasshopper development is progressing and populations are primarily in the adult stage (Fig. 1). Based on model runs, approximately 65% of the population should be in the adult stage (50% last week). Grasshopper development continues to be slower than average development. Based on climate data, 80% of the population would be expected to be in adult stage. Model output indicates that oviposition has begun in southern areas prairies (Fig. 2).
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| Figure 1. Predicted percent of grasshopper (Melanoplus sanguinipes) populations attaining adult stage across
the Canadian prairies (as of August 14, 2019).
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| Figure 2. Predicted overview of where oviposition has started (as of August 12, 2019). |
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" which is available as a free downloadable document in either an English-enhanced or French-enhanced version.
Saturday, 10 August 2019
Predicted grasshopper development (August 8, 2019; Wk 18)
Grasshopper Simulation Model Output – Recent, warmer temperatures have resulted in increased grasshopper developmental rates. Surveys in central SK (last week) indicated that grasshopper populations are primarily in the fifth instar and adult stages and in some areas C. pellucida are very abundant. Based on model runs, approximately 50% of the population should be in the adult stage (24% last week). Based on climate data, 60% of the population would be expected to be in adult stage. Model output indicates that oviposition has begun in southern areas prairies.
The first map (Fig. 1) indicates the average instar for grasshopper populations across the prairies with most areas have grasshopper populations that are in the 5th and adult stages. The second map (Fig. 2) indicates adult populations are developing across areas between 49 and 52 degrees North. The last map (Fig. 3) provides an overview of where oviposition is predicted to have started. The yellow and red areas show that oviposition has began across southern MB, southeastern SK and southern AB.
The Insect of the Week's Doppelganger featured GRASSHOPPERS for Week 14!! Check out the excellent nymph photos to help your in-field scouting!
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" which is available as a free downloadable document in either an English-enhanced or French-enhanced version.
The first map (Fig. 1) indicates the average instar for grasshopper populations across the prairies with most areas have grasshopper populations that are in the 5th and adult stages. The second map (Fig. 2) indicates adult populations are developing across areas between 49 and 52 degrees North. The last map (Fig. 3) provides an overview of where oviposition is predicted to have started. The yellow and red areas show that oviposition has began across southern MB, southeastern SK and southern AB.
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| Figure 1. Predicted development stages of grasshopper (Melanoplus sanguinipes) populations across
the Canadian prairies (as of August 5, 2019).
|
 |
| Figure 2. Predicted percent of grasshopper (Melanoplus sanguinipes) populations attaining adult stage across
the Canadian prairies (as of August 5, 2019).
|
 |
| Figure 3. Predicted overview of where oviposition has started (as of August 5, 2019). |
The Insect of the Week's Doppelganger featured GRASSHOPPERS for Week 14!! Check out the excellent nymph photos to help your in-field scouting!
Biological and monitoring information related to grasshoppers in field crops is posted by Manitoba Agriculture, Saskatchewan Agriculture, Alberta Agriculture and Forestry, the BC Ministry of Agriculture and the Prairie Pest Monitoring Network. Also refer to the grasshopper pages within the "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" which is available as a free downloadable document in either an English-enhanced or French-enhanced version.
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