Western Bean Cutworms primarily affect corn in Kansas, primarily in the western part of the state. Understanding their lifecycle is crucial for effective control. Moths emerge in early June (July for northwestern areas) as eggs are laid on leaves and turn purple before hatching. Caterpillars feed on developing kernels before overwintering in the soil.
Pheromone trap counts can help detect moth emergence, aiding timely scouting. For effective control, early detection of egg masses is essential before larvae enter corn ears. Chemical control may be warranted when about 8% of plants have eggs or small caterpillars around tasseling. Delaying control after silk emergence or if larvae are already in the ear tips will reduce effectiveness.
Current trap counts indicate the Western Bean Cutworm flight is winding down in southwest Kansas. Traps in Finney County captured 260 moths in July, 60% lower than the same period in 2022. Similar trends are seen in Meade County, where the flight should conclude in early August.
Northwest Kansas saw low initial trap numbers, but Thomas County experienced a significant increase in the last week of July, warranting scouting for at-risk corn.
For more control pest options and information, visit field guide page of farms.
Stay informed and protect your corn crops from these pesky pests!
Photo Credit: istock-sandramatic
Categories: Kansas, Crops