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IPM Insect Trapping Update - Canola

Posted: Aug 05 2022

Canola: IPM Crop Scouts have placed pheromone traps out for bertha armyworm and diamondback moth at 21 trap sites in 12 counties, mainly in northern canola growing areas (Table 1). Canola growth stages ranged from early to late flowering.

Trap catches for bertha armyworm continue to be low, <10 moths per trap per week, with 86% of the trap sites capturing moths. Bertha armyworm threshold for scouting is based on the cumulative number of moths captured over the season, which are low, below 300 cumulative moths per season (non-economic). See scouting article for bertha armyworm larvae in canola, in the past Crop & Pest Report #11, July 14.

Trap catches for diamondback moths continued to increase for the second week in a row with a total of 924 moths compared to a total of 416 moths last week. Moths were captured at 71% of the trap sites, mainly in eastern ND. When diamondback moth trap catches are above 100 moths per trap per week, canola fields should be scouted for larvae. See past scouting article for diamondback moth larvae in canola in the past Crop & Pest Report #11, July 14.

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