Pollination is complete for most cornfields in Iowa, but it is still important to continue scouting for insect pests that may be robbing corn yields as the season progresses. Extension specialists do not recommend using foliar insecticides unless scouting determines a need to spray. Some pests are resistant to older active ingredients, such as pyrethroids, and careful identification will determine what product would be more effective. In addition, prophylactic use of insecticides will limit any benefits that natural enemies may provide.
Look for post-pollination pests
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Corn leaf aphids appear near the tassel.
Spider mites and webbing are seen in corn.
Corn earworm are found with frass and molds.
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