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Western bean cutworm trapping in the Panhandle and southwestern Nebraska (opens the original)
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By the end of the week on Aug. 28, trap data is beginning to indicate the end of moth flights. Overall, the populations in 2026 have been high. In dry beans, scout now across western Nebraska and consider treatment if pod feeding exceeds 0.5-1%; the ideal treatment window is 10-21 days after flight peak. In corn, if the larvae have moved down the silk in ears, contact insecticides will not be effective. For corn, a match between moth flight and the late whorl-to-early tassel stage can result in
Western Bean Cutworm trapping in the Panhandle and Southwestern Nebraska (opens the original)
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The Western bean cutworm weekly update ending July 31 shows corn at the ideal spraying stage (>95% tasseled) if exceeding the threshold of 5-8% egg masses after scouting. In dry beans, scout now in high-risk areas (>1700 cumulative moth counts); consider treatment if pod feeding exceeds 0.5-1% after scouting. The ideal treatment window is 10-21 days after flight peak. Western bean cutworm can be a serious pest in corn and dry beans. When their populations or infestations exceed thresholds, insec
Western bean cutworm trapping in the Panhandle and southwestern Nebraska (opens the original)
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The 2026 Weekly Update (July 3): overall numbers are two weeks earlier than they were at this time last year. The Western bean cutworm can be a serious pest in corn and dry beans. When their populations or infestations exceed thresholds, insecticide treatment is warranted, and timely treatment is crucial for management success. Moth flight data can be used to inform timing of in-field scouting and treatment. However, insecticide treatment should not solely rely on moth flight data. For corn, a m
Nebraska Extension urges scouting after beet armyworm observed in sugar beet (opens the original)
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On June 18, 2026, Nebraska Extension received a caterpillar sample collected from sugar beet for identification. The caterpillar was suspected to be a beet armyworm larva but lacked the distinctive black dot behind the head (Figure 1). Although identification is still underway, continuous feeding and defoliation have been reported in sugar beet fields with the presence of those caterpillars. Although confirmation awaits adult moth emergence (specimens currently in the pupal stage, Figure 2), it
Western Bean Cutworm trapping in the Panhandle and Southwestern NE (opens the original)
Read excerpt
2026 Weekly Update (July 3): overall numbers are two weeks earlier than they were at this time last year. The Western bean cutworm can be a serious pest in corn and dry beans. When their populations or infestations exceed thresholds, insecticide treatment is warranted, and timely treatment is crucial for management success. Moth flight data can be used to inform timing of in-field scouting and treatment. However, insecticide treatment should not solely rely on moth flight data. For corn, a match
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