Canola Insect Trapping 2026 | Northern Canola Growers Association

Canola Insect Trapping Update Canola crop stages ranged from 2 (rosette stage) to 4.3 (lower pods starting to fill). Diamondback moth trap catches ranged from 0 to 94 moths per trap per week for the last week.

The hot spots were in Nelson County (94 moths per trap), Pierce County (74 moths per trap) and Pembina County (52 moths per week). Several natural factors can negatively affect populations of diamondback moths.

Heavy rain occurring throughout the state can drown many larvae of the first or second generation. Humid conditions associated with rain can also favor the development of lethal fungal diseases, such as Entomophthorales.

The crop is most susceptible to diamondback moth larval feeding injury from blooming to early pod development. Bertha armyworm counts continue to be below the cumulative moth threshold of >300 moths at all trap sites. The cumulative moth count serves as a predictive risk indicator of larval infestation in the field and as a guide for when to scout fields.

Early detection of adult moths through pheromone trapping also helps to determine the relative abundance of bertha armyworm in an area. The crop is most susceptible to Bertha armyworm larval feeding injury during pod development.

Janet J. Knodel Extension Entomologist & Patrick Beauzay Research Specialist & IPM Coordinator

*Story from NDSU's Crop & Pest Report*