Thursday, 16 May 2019

Prairie Crop Disease Monitoring Network (May 16, 2019; Wk 06) - Turkington

New for 2019 - 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.

Synopsis of May 14, 2019, Weekly Cereal Rust Risk Report: 
Wind trajectory and cereal rust risk assessment and need for in-crop scouting in the Prairie region, May 14, 2019
1.  Pacific Northwest – Given limited stripe rust development in the PNW, a low number of recent wind trajectories from the PNW, cool Prairie weather conditions, and early stages of Prairie crop development, as of May 14, 2019, the risk of stripe rust appearance from the PNW is limited and scouting for this disease is not urgent.  
2.  Texas-Nebraska corridor – Although leaf and stripe rust development continues in this corridor, the disease is mainly affecting the lower canopy at generally low levels.  There has been a low number of recent wind trajectories from this area, cool Prairie weather conditions, and early stages of Prairie crop development.  As of May 14, 2019 the risk of leaf and stripe rust appearance from the Texas-Nebraska corridor is low and scouting for these diseases is not urgent.  
3.  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.
4.  Access the full downloadable report.