Stumpf International Wheat Center near Grant. The 2015 field trial was located at the West Central Water Resources Field Laboratory near Brule, while the 20 trials were located at the Henry J.
Western bean cutworm larva on corn with secondary fungal infectionīetween four and 14 insecticide treatments (including an untreated control) were tested each year. In this study we evaluated the efficacy of foliar insecticide treatments for the control of western bean cutworm in field corn plots during 2015-2017.įigure 3. Effective management of WBC depends on selecting the best product for your farm and rotating insecticide mode of action to prevent or delay the development of resistance.
There are numerous chemicals labeled for WBC larval control. Thus, scouting and application timing are critical. Insecticide applications will only be effective prior to larvae entering the ear, as larvae must come into contact with pesticides either directly during applications or through residuals on the plant surfaces. Scouting is critical to determine whether the economic threshold has been reached (in Nebraska the threshold is 5-8% of plants with an egg mass or larvae) and to determine appropriate application timing (recommended application time is when 95% of the plants in a field have tasseled). Control tactics have focused primarily on using Bt traits that are effective at controlling WBC larvae or applying foliar insecticides after scouting has determined that the economic threshold has been met. In corn, damage is caused by direct feeding on developing kernels, which causes yield loss and potential secondary fungal infections. The western bean cutworm (WBC) is an economically important pest of corn and dry beans.
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