Predicted pea leaf weevil development

Pea Leaf Weevil (Sitona lineatus) –  As of June 14, 2020, PLW model runs indicate that PLW females continue to oviposit eggs.  The following two graphs illustrate that egg numbers continue to increase at Swift Current (Fig. 1) and Lacombe (Fig. 2).  This week, first appearance of PLW larvae is expected to occur at Swift Current (Fig. 1). 

Figure 1. Predicted pea leaf weevil (Sitona lineatus) phenology at Swift Current SK.
Values are based on model simulations (April 1-June 14 2020).

Figure 2. Predicted pea leaf weevil (Sitona lineatus) phenology at Lacombe AB.
Values are based on model simulations (April 1-June 14 2020).

Link here to access photos of PLW and related species of weevils which can all be active simultaneously in Canadian prairie field crops. 

Biological and monitoring information related to pea leaf weevil in field crops is posted by the province of Alberta and in the PPMN monitoring protocol.

Also refer to the pea leaf weevil page within the "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.