Begin sweep netting for cabbage seedpod weevil when canola enters the flowering period. Select 10 locations within each field and at each location, count the number of weevils from ten 180° sweeps. At current prices, the threshold will be around 20-30 per 10 sweeps (2-3 per sweep). Anything below that and the canola plant will generally compensate for seedpod weevil…
Insect update: Cabbage seedpod weevil
June 20, 2012