Effects of Tepa on the Reproductive Organs and Embryogeny of the German Cockroach


Source: Journal of Economic Entomology, Volume 59, Number 6, December 1966 , pp. 1419-1423(5)

Publisher: Entomological Society of America

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A rotary microtome was modified to inject precise amounts of tepa into German cockroaches, Blattella germanica (L.). Dosages of 0.9 g produced sterility in males injected as 7th-instar nymphs, doses of 5 g reduced the hatching of eggs laid by females as 7th-instar nymphs by 96%, and doses of 10 g were toxic to nymphs of both sexes. Doses of 4 and 5 g injected into adult males produced complete sterility but did not prevent the males from mating; the sperm were motile. Doses of 3-10 g injected into females reduced the number of oöthecae produced, and only 4% of the females injected with 10 g produced oöthecae; these females died while carrying the oöthecae. Hatch occurred at all dosages except 10 g. Tepa stopped spermatogenesis and caused the testes to atrophy. Degenerative effects were first observed in the germarium and progressed until the sperm bundles were the only recognizable structures remaining in the sperm tubes. The basal oöcytes from females treated with tepa were significantly smaller than the oöcytes from females injected with solvent only. Tepa also caused abnormal oöcyte development and partial deterioration of the ovaries. Embryonic development was observed in eggs from unmated females, but various degrees of deformity were observed in some embryos. One fully developed embryo removed from an oötheca of an unmated female eventually became an adult female that failed to mate or reproduce. No unaided hatch was observed from oöthecae of unmated females. No hatch occurred from oöthecae formed by females mated with sterilized males. The degrees of embryonic development or deformity were within the range of those observed in eggs from unmated females.

Document Type: Research Article

Publication date: December 1, 1966

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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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