Sperm Precedence in Helicoverpa zea (Lepidoptera: Noctuidae): Response to a Sub sterilizing Dose of Radiation

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Sperm priority patterns in Helicoverpa zea (Boddie) were studied by sequentially mating females to substerilized (10 krad) and normal males. Progeny of substerilized males were identified by visible chromosomal aberrations in the testes. Sperm from irradiated males were competitive with sperm from normal males when the intermating interval of the female was 48 h, but sperm competitiveness of the irradiated male was reduced when the intermating interval of the female was 24 h. Sperm use by twicemated females did not change significantly over time after the second mating. H. zea demonstrated incomplete last-male precedence with extensive sperm mixing. Variability in the degree of sperm precedence was high, suggesting that the outcome of sperm competition within each female depends upon the relative competitiveness of all ejaculates involved.

Document Type: Research Article

Publication date: June 1, 1992

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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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