Crop & Pest Report

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Corn Aphids (07/27/17)

Large numbers of aphids are being reported in field corn in southeast North Dakota.

 Corn Aphids

Large numbers of aphids are being reported in field corn in southeast North Dakota. The critical period for injury by corn leaf aphid is from tassel emergence through pollination. Treatment is suggested only when 50% of the corn plants have 100+ aphids per plant during tassel emergence and plants are drought stressed. Usually high numbers of beneficial insects help to reduce aphid populations. When natural enemies are present in large numbers, and the crop is well developed, farmers are discouraged from spraying fields.

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Janet J. Knodel

Extension Entomologist

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