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Corn Earworm Damage to Ears with Starchy (su1) vs. Sugary (su1) Kernels on Genetically Uniform Mother Plants1

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Damage by Heliothis zea (Boddie) to ears of 2 sweet-corn hybrids, each hand-pollinated to produce contrasting starchy (Su1) and sugary (S11) kernel types with uniform mother-plant characters, was measured in 9 trials in 1965, 1966, and 1967_ Ears were either infested at silking and rated 18 days later, or infested 10 days after silking and rated at hard-dough stage about 20 days later. In 5 out of 7 trials infested at silking there was no significant difference in damage to the 2 kernel types; in 2 trials involving a slightly no uniform ear bagging procedure, significant differences occurred. In 2 other trials involving late infestation, deliverances were significant or near significant. Evidently kernel carbohydrate content is of little importance in earworm resistance up until fresh market stage, but may be more important during later development.

Document Type: Research Article

Publication date: October 1, 1969

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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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