Mortality of Sweet potato Weevil (Coleoptera: Apionidae) Stages Exposed to Gamma Irradiation

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Sweet potato weevil, Clyas formicarius (F.), eggs; first, seeoud, and third insstars; pupae; and adults in roots of sweet potato, Ipomoea balatas (L.) Lam., cultivar Jewel, were exposed to gamma irradiation doses ranging from 100 to 1,000 Gy. Criterion of effectiveness of the irradiation dose was based on preventing adults emerging from treated roots infested with different stages of the weevil. Dose-mortality data were analyzed by logistic, Gompertz, and normal probit probability density functions with and without log 10 conversions. Gompertz probability density function analysis gave the best 99.9968% mortality estimates (and 95% FL) against stages of sweet potato weevil in roots: 37 Gy (35-42 Gy) for eggs (no log 10 conversion); 73 Gy (53-132 Gy) for first instars (log 10 conversion); 38 Gy (31-.55 Gy) for second instars (log 10 conversion); 28 Gy (23-4.5 Gy) for third instars (no log 10 conversion); and 1,497 Cy (963-2,229 Gy) for pupae (log 10 conversion). Pupae irradiated With ≥800 Gy produced no adults when efficacy tests were done. Irradiating adults in roots with 1,000 Gy did not prevent adult ('mergence. However, males exposed to 150 Gy were sterile, and females exposed to 300 Gy were sterile.

Document Type: Research Article

Publication date: June 1, 1995

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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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