Ontario Grain Farmer February 2021
of WBC showed that hybrids containing the Vip3A Bt had less kernel damage, disease severity, and total DON than a hybrid that didn’t contain the protein. Smith also notes that when WBC larvae are in an early stage (i.e. 1st instar) they are more susceptible to Vip3A. As the larvae mature (3 rd and 5 th instars) the Vip3A expression may not be high enough to control, increasing the risk of resistance developing to the protein. When looking at insecticidal control of WBC, Smith shares that multiple insecticides were used in the study to control WBC. As with all insecticides, reading and following the label is crucial. In order to delay WBC resistance and manage the insect effectively, a combination of control measures should be used. Farmers should note that scouting is a great option to help control WBC. Scouting should occur during peak moth flight. The Great Lakes and Maritimes Pest Monitoring Network identifies areas that should be scouted by analyzing weekly trap counts of WBC across the province. Rotating between the Vip3A Bt trait and foliar insecticides are also viable and recommended options. Following an insect resistance management plan will provide corn producers with a long-term strategy for successful WBC management. Laura Ferrier is an agronomist with Grain Farmers of Ontario. l ONTARIO GRAIN FARMER 11 FEBRUARY 2021 This article features research funded by Grain Farmers of Ontario.
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