Predicted grasshopper development (Apr 24, 2019; Wk 3)

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).  

Model runs were conducted for Lethbridge AB and Saskatoon SK.  As of April 23, 2019, predicted development was 57% for both locations and is similar to long term average values. The following graph illustrates that gradual development has occurred during the past three weeks. Hatch is expected to occur in mid to late May.

More information can be found by accessing the grasshopper pages within the new "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.