Across the prairies the grasshopper hatch is well underway with most locations having approximately 27% of the population in the egg stage. Based on model runs, approximately 33% (30% last week) of the population is in the first instar, 26% (14.5% last week) is predicted to be in the second instar, and 11% (4.3% last week) in the third instar and just over 1% are predicted to be in the fourth instar. The following map indicates that grasshopper populations across the southern prairie are mostly in the second instar.
|Figure 1. Predicted development stages of grasshopper (Melanoplus sanguinipes) populations across|
the Canadian prairies (as of June 24, 2019).