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Late Season Insect Pressure is Low in Canola

Posted: Aug 12 2022


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 late flowering (4.4) to pod ripening (5.2).

Trap catches for bertha armyworm continue to be very low, 0-22 moths per trap per week, with 43% of the trap sites capturing moths. Cumulative numbers of bertha armyworm moths per season are low, below the economic threshold of >300 cumulative moths per season. So, no risk of bertha armyworm in canola so far. 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 decrease with a total of 606 moths compared to a total of 924 moths last week. Moths were captured at 57% of the trap sites, mainly in eastern ND. Two sites located in Cass and Ramsey Counties continue to be over 100 moths per trap per week. 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.

15.CPR_.August 11.2022.pdf (ndsu.edu)


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