Abstract
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.
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