|Figure 1. Predicted PLW phenology at Swift Current based on long term climate data.|
Values are based on model simulations (April 1 – May 6).
The pea leaf weevil resembles the sweet clover weevil (Sitona cylindricollis) but the former is distinguished by three light-coloured stripes extending length-wise down thorax and sometimes the abdomen. All species of Sitona, including the pea leaf weevil, have a short snout.
|Figure 2. Comparison images and descriptions of four Sitona species adults including pea leaf weevil (Left).|
Adults will feed upon the leaf margins and growing points of legume seedlings (alfalfa, clover, dry beans, faba beans, peas) and produce a characteristic, scalloped (notched) edge. Females lay 1000 to 1500 eggs in the soil either near or on developing pea or faba bean plants from May to June.
Reminder - The 2017 risk map for pea leaf weevils was released in March 2018. The map is based on the number of feeding notches observed in peas (Fig. 3).
|Figure 3. Estimates of pea leaf weevil (S. lineatus) densities based on feeding notches observed in |
peas grown in Alberta and Saskatchewan in 2017.
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. A review of this insect was published in 2011 in Prairie Soils and Crops by Carcamo and Vankosky.