Variations in wind direction and speed (which affect the migration and ultimate distribution of the moths), stage of corn development, and local environmental conditions are factors that strongly influence the severity of black cutworm infestations. Moths migrate northward from southern states in early spring and deposit eggs on grasses, broadleaf weeds, and crop residue before corn in planted. Black cutworms do not overwinter in Nebraska. Identification and Life History Black cutwormsīlack cutworms cause most of the serious cutworm problems in eastern Nebraska, but are seldom found west of the 100th meridian, which runs through Dawson County. Other less common cutworm species include sandhills, glassy, spotted, and bristly cutworms, and occasionally army cutworms and pale western cutworms in western Nebraska. Dingy and black cutworms are the species most often associated with damage to corn in eastern Nebraska, although darksided cutworms also may be important in northeast and western counties. Fields with heavy plant residues or early season weed growth also are susceptible to cutworm attack. Central and western Nebraska corn may be affected by cutworms when corn follows sod, pasture, alfalfa, soybeans, small grains, or winter cereal cover crops. Severe cutworm damage to corn is rare in Nebraska and usually is confined to localized areas in eastern Nebraska. They are commonly referred to as cutworms and may reduce plant stand and yield if abundant. Several types of caterpillars feed on seedling corn and may cut the stem. Diagnostic features to identify black cutworms. Other Insects Causing Similar Damage Symptomsįigure 1. Conditions That Favor Black Cutworm Infestations.This publication discusses cutworms in corn - identification, conditions that favor infestations, damage they cause, and control.
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