Feasibility of using Trichomalus perfectus for biological control of cabbage seedpod weevil in the Prairies

Key Result

This research is currently in progress, assessing the efficacy of Trichomalus perfectus in managing seedpod weevil in Quebec and its non-target effects in Eastern Canada to see if it or other parasitoids in cultivated and uncultivated habitats could have an impact (directly or indirectly) in the Prairies.

Project Summary

Purpose

To assess the efficacy of Trichomalus perfectus in managing seedpod weevil in Quebec and its non-target effects in Eastern Canada. To document the species of weevils and parasitoids in cultivated and uncultivated habitats that could be affected directly or indirectly in the Prairies.

Progress

In 2020, staff from the University of Lethbridge, Canola Council, Alberta Agriculture and Saskatchewan Agriculture sampled around 28 canola fields to determine effect of landscape structure on cabbage seedpod weevil, and to search for potential non-target weevils in canola. Potential predators of cabbage seedpod weevils were investigated using simple container tests at home or field observations. Effects of previous year distance to canola fields was investigated using an AAFC digital repository for about 76 canola sites dating from 2015 to 2020, with more to come from past studies.