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). 
Figure 1. Predicted percent of grasshopper (Melanoplus sanguinipes) populations attaining adult stage across 
the Canadian prairies (as of August 14, 2019). 
Figure 2. Predicted overview of where oviposition has started (as of August 12, 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 AgricultureSaskatchewan AgricultureAlberta 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.