Sexual Sterilization of Screw-Worm Flies:1 Reliability of the Chemosterilant Technique2,3


Source: Journal of Economic Entomology, Volume 62, Number 1, February 1969 , pp. 136-139(4)

Publisher: Entomological Society of America

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When newly emerged male Cochliomyia hominivorax (Coquerel) were treated topically with N,N'-tetramethyl-enebis (1-aziridinecarboxamide) and mated with mature virgin females, the percentage of sterile males increased curvilinearly with dose from 0 at the lowest doses (0.01- 0.05%) to 100 at the highest dose (10%).

In 5 years of testing with bis (l-aziridinyl) (hexahydro-IH- -azepin-I-yl) phosphine oxide, I-[bis (1.aziridinyl)phosphinyl] -3- (3,4-dichlorophenyl) urea, and N,N'-tetra methyl. enebis (1-aziridinecarboxamide), the average percentages of hatch for the many thousands of eggs resulting from matings between untreated females and treated males were 0.8, 0.07, and 0.2, respectively. When eggs that were fertilized by spermatozoa treated with 0.5% N,N'-tetramethylenebis (1-aziridinecarboxamide) were cultivated, the ad- verse effects were expressed in the embryonic but not in the larval or pupal stages. However, the spontaneous mortality of the immature stages reduced the risk that a viable egg would develop into a reproductive adult by a factor of 3. Also, in a simplified hypothetical release program. the risk (owing to failure of a chemosterilant) of releasing a fertile male to mate with a fertile female can be further reduced by a factor of 4 when a population is dense (500 flies per sq mile) and by a factor of 80 when a population is sparse (10 flies per sq mile).

When males were chemosterilized with 10% N,N-tetramethylenebis( 1-aziridinecarboxamide) applied topically and mated 4 or 5 times with virgin females at 2- to 4-day intervals, they retained their sterility for 2.5 weeks, i.e., as long as they lived and continued to mate.

Document Type: Research Article

Publication date: February 1, 1969

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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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