Bob Hammon, robert.hammon@colostate.edu, Colorado State University, Tri River Cooperative Extension, P.O. Box 20,000-5028, Grand Junction, CO
Dusky sap beetle and corn earworm are the primary insect pests in western Colorado sweet corn. Sap beetle infestation occurs independently of corn earworm, and causes a significant acreage to be rejected due to contamination each year. We determined that pheromone trapping is not useful in as a predictor of sap beetle infestation. Monitoring of field infestations has shown that sap beetles enter sweet corn ears in the week before harvest. Susceptible varieties have short and/or loose husks. These characteristics change with high temperature and crop maturity. Sap beetle infestation of sweet corn decreases in mid summer, after local field corn begins pollination. Chemical control efforts focus on protecting sweet corn silks during the week before harvest, and a modified spray program has been somewhat successful in limiting sap beetle infestation. A degree day model is being developed to determine the timing of sap beetle control initiation. A risk management model has been developed that takes variety, crop timing and geographic hot spots into account. Integrated management of sap beetles is possible when a combination of risk management, variety selection, timely harvest, and chemical control is utilized.
Species 1: Coleoptera Nitidulidae
Carpophilus lugubris (Dusky sap beetle)
Species 2: Lepidoptera Noctuidae
Helicoverpa zea (Corn earworm)
Keywords: sweet corn
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