Pheromone Production and Sterility in Boll Weevils: Effect of Acute and Fractionated Gamma Irradiation

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Each of 3 methods of irradiating male Anthonomus grandis Boheman resulted in a unique pattern of pheromone production over a 12-day period of observation. Peak pheromone production occurred 4–6 days after treatment in males given a single large dose of gamma irradiaton (acute irradiation) at the age of 4 days and in males given small increments of irradiation (fractionated irradiation) during the late pupal and early adult stages. Both groups produced much less pheromone during the next 3 days. The acute irradiated weevils, destined to die soon, produced no pheromone after the 9th day, whereas the fractionally irradiated males began to show a partial recovery. Males fractionally irradiated entirely during the adult stage produced a moderate but constant amount of pheromone during the entire 12-day period. Measurements of attractiveness of treated males placed in field traps produced results that were in general agreement with the laboratory data.

Male sterility for all 3 treatments was ca. 99%, and from 66–82% of the males were able to transfer sperm 7 days after treatment. Females irradiated during the pupal and adult stages were completely sterile, producing no eggs. The 2 groups of females irradiated as adults produced some egiS and it was necessary to incorporate a dip treatment consisting of 0.02% diflubenzuron (Dimilin®;N-[[(4-chlorophenyl) animo] carboynl]-2,6-difluorobenzamide) in acetone to suppress viability.

Document Type: Research Article

Publication date: August 1, 1978

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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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