Thursday 13 July 2017

Weekly Update (Jul 13, 2017; Wk 11) - Alfalfa weevil

Alfalfa Weevil (Hypera postica) – Across the prairies, the model indicates that 95% of the population should be in the pupal stage. This week adults should be appearing at most locations. Output indicates that adult emergence is well underway at many southern locations (Brooks, Estevan) , while adult emergence at many central locations (Saskatoon) has begun over the last five days.

In terms of degree-day heat units, the map below reflects the predicted development of alfalfa weevil across the Canadian prairies.

Alfalfa growers are encouraged to check the Alfalfa Weevil Fact Sheet prepared by Dr. Julie Soroka (AAFC-Saskatoon) and additional information can be accessed by reviewing the Alfalfa Weevil Page extracted from the "Field crop and forage pests and their natural enemies in western Canada - Identification and management field guide" (Philip et al. 2015).  That guide is available in both a free English-enhanced or French-enhanced version.