By: Kaeley Kindrachuk B.App.Sc., AT, Regional Crops Specialist, Outlook
In 2013, the cabbage seedpod weevil started the move north of the South Saskatchewan River and east into the traditional canola growing regions. Producers bordering this region should be on the lookout for this little pest early in the season.
Start scouting for the cabbage seedpod weevil as the host crops begin to bud and continue through flowering. This weevil is tough to spot just by looking at plants, as it drops to the ground and plays dead when it is disturbed, so using a sweep net is important. When sweeping for the weevils, sweep from 11a.m. to 5p.m. when winds are calm and temperatures are above 20 C. Take 180° sweep net samples in ten spots throughout the field. The economic threshold is three to four adults per sweep or depending on commodity prices, 20 weevils per10 sweeps. If an insecticide treatment is warranted, spray when the crop is between 10 and 20 per cent flower to reduce egg laying in new pods. Spray later in the day when pollinators and other beneficial insects are less active.
For more information on the physical characteristics and behaviour of weevils please visit our cabbage seedpod weevil web page.
View the latest cabbage seedpod weevil survey map.