Thursday, 19 May 2016

Weekly Update (May 18, 2016; Wk 03) - Predicted Grasshopper Development

Grasshoppers (Acrididae) – Cooler conditions over the past seven days resulted in a return to average grasshopper development. 

For the week of May 8-15, 2016, the predicted mean embryological development was 75% (last week was 74%).  Grasshopper egg development is greater than 80% across most of southern and central Alberta indicating that hatch will rapidly progress over the next two weeks within the areas highlighted in red on the map below. The model predicted that 5% of the hatch is already underway. Peak hatch (approx. 16%) was predicted to occur in the area around Alsask SK to Hanna AB and south to Brooks and Vauxhall AB.

Recall that the 2016 Grasshopper Forecast Map circulated in January predicted the following risk areas.  

Biological and monitoring information related to grasshoppers in field crops is posted by the provinces of ManitobaSaskatchewanAlbertaBritish Columbia and the Prairie Pest Monitoring Network.  Also refer to the grasshopper pages within the new "Field Crop and Forage Pests and their Natural Enemies in Western Canada: Identification and management field guide" - both English-enhanced or French-enhanced versions are available.