Fields with winter annual weeds, or abundant crop residue are more attractive to the egg-laying black cutworm moths in the spring. They are most commonly found in the eastern one-fourth of the state. The black cutworm does not overwinter in Nebraska, and infestations depend on moths moving up in southerly spring winds. The fact that moths are being seen now indicates that the immature stages have pupated or emerged as adults, so no further feeding is expected this summer. These moths do not lay eggs in the spring, but rather, in the fall. We have had questions about the potential for army cutworms to damage to corn, based on the high numbers of moths already being seen in parts of Nebraska. The severity and the area affected will vary greatly, depending on species involved, previous crop history, and weather conditions. For example, Herculex I Bt corn hybrids list black cutworm on the label, but not other soil cutworm species.Ĭutworms can cause serious damage to corn in the first couple weeks after emergence so it is important to scout fields early for damage. In some cases products are not labeled for the full spectrum of Nebraska insects. High populations of insects can overwhelm the protection method, regardless of whether it was an insecticide applied at planting (liquid, granular, or seed treatment) or a Bt corn hybrid. Since wireworms and white grubs feed underground and cutworms feed on or below the soil surface, scout for plant damage and then dig in soil around the plant to identify the insect causing the damage.Ĭutworms and other insects may hinder emerging corn plants this spring, even if seed was treated with insecticide or Bt corn hybrids were used. It is rare to see these problems in continuous corn, but exceptions happen. Wireworms and white grubs are most often associated with fields that have been in pasture or CRP where the grasses were allowed to grow for more than one year. Most early season insect damage would be caused by cutworms, wireworms, or white grubs. This content requires Flash Download the free Flash Player now! var s1 = new SWFObject('','player','250','30','10') s1.addParam('allowfullscreen','true') s1.addParam('allowscriptaccess','always') s1.addParam('flashvars','duration=324&file=') s1.write('Insects050412') Īs corn begins to emerge, be alert to the potential damage that may be caused by early season insects.
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