Friday, 19 August 2016

Weekly Update (August 17, 2016; Wk 16) - Grasshoppers (Updated)

Grasshoppers (Acrididae) – Across the prairies the model indicates that 80% of the population should be in the adult stage. This is approximately 10% greater than average. Oviposition is predicted to be well underway and is most advanced in Manitoba and southeast Saskatchewan.  

In central Saskatchewan, grasshopper development is slightly ahead of average development. The following graph shows predicted grasshopper development at Saskatoon for August 7, 2016. The model indicates that oviposition is well underway.  

Melanopline development for Saskatoon (August 12, 2016) was 5.6. The most abundant species was M. dawsoni (40%), followed by M. bivittatus (21.6%).

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.