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Small-Plot Tests with Synthetic Juvenile Hormones on Alfalfa Weevil in Maryland and Pennsylvania

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When synthetic juvenile hormones were field-tested in 1971 and 1972 in Maryland and Pennsylvania vs. 4th instars of Hypera postica (Gyllenhal), 1 compound significantly increased the mean weight of normal adults, and substantially increased the mortality of pupal-teneral adult weevils. A dose-mortality correlation was observed with 6,7-epoxy-3,7-dimethyl-l-(3,4-[methylenedioxy]phonoxy)-2-nonene, and repeatable biological activity was demonstrated at both locations, but the 2nd application often did not increase performance. At any given dose, fewer than 10% of the live adult weevils had morphogenic aberrations. No untimely ovipositional activity that indicated premature termination of adult diapause was observed.

Document Type: Research Article

Publication date: February 1, 1974

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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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