Competitiveness of males of Ceratitis capitata (Wiedemann) , irradiated in the late pupal stage with 5- to 11- krad gamma radiation was evaluated from the egg hatch resulting when irradiated males were confined in various ratios with untreated pairs of insects. Competitiveness decreased with increased close. This factor counteracted the increased degree of sterility induced by increased dose, so doses of 5-11 had led to similar reductions in egg hatch. 'With increased replication it was possible to distinguish between the degree of control given by 5-, 7-, or 9-krad-treated males and 9 krad gave the poorest control. Although 7 had a1lm"ed a slightly higher level of fertility in males than did 9 had (5% vs. 1-2%, respectively) the data indicate that use of 7 had rather than 9 had should be seriously considered in eradication, and especially suppression, programs for this species. Evidence was obtained that the presence of sterile females neither augmented nor detracted from the degree of control given by irradiated males. The egg hatch of females confined with irradiated males after an initial mating with untreated males was lowered, but to a smaller extent, as the dose given to males was increased from 5 to 11 had. With the reverse mating sequence the increase in egg hatch was greater as the irradiation dose was increased.
Document Type: Research Article
Publication date: February 1, 1972
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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.