Corn Earworm Damage and Loss in Grain Sorghum1

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Corn earworm (Heliothis zea (Boddie)) damage on Westland, RS610, and Plainsman grain sorghums was evaluated using cages to confine larvae to the heads. One larva per head consumed an average of 166 kernels. Approximately 274, 370, 497, 632,690,785,915, 1,010, 1,068, 1,219, 1,406, and 1.549 kernels were eaten by 2 through 13 larvae, respectively. Percentage losses for the respective levels of infestation, 1 through 13, were 6, 10, 13, 16,20,23,27,30,33,37,40,44, and 48. The equation, Ŷ=71+102X, can be used to predict the number of kernels that "X" larvae will destroy on a head. When the number of kernels on an average head is known, the percentage loss can be calculated and used in making control recommendations and crop-loss estimations.

Document Type: Research Article

Publication date: August 1, 1962

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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