High- or Low-Temperature Treatments Affecting Alfalfa Weevil1 Fecundity2 Egg Fertility, and Longevity3


Source: Journal of Economic Entomology, Volume 65, Number 1, February 1972 , pp. 146-148(3)

Publisher: Entomological Society of America

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High or low temperature treatments for sterilization or desemination of adult Hypera postica (Gyllenhal), reduced fecundity, fertility, and longevity. Females mated to males which had been exposed to 40 for 24 hours prior to mating laid a reduced number of eggs, as did females mated before or after exposure at 40 for 24 hours. Mated females kept at 35 for 4 weeks, and 2 groups of mated females exposed to 47 and -5, respectively, for 10 minutes showed a further reduction in fecundity. Females from all treatments except the one in which females were treated prior to mating showed reduced fertility, indicating that damage to sperm was the major factor reducing fertility. Untreated control weevils held at 23 laid many more eggs of higher fertility, had a longer oviposition period, and had a greater longevity than treated weevils. Heat treatment of un- mated males damaged sperm. Heat treatment of virgin females retarded ogenesis and possibly damaged eggs. Mated females exposed to high or low temperatures prob. ably incurred damage to both eggs and stored sperm. Untreated females suffered reduced longevity when mated with heat-treated males.

Document Type: Research Article

Publication date: February 1, 1972

More about this publication?
  • 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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