Fall and Spring Oviposition of the Alfalfa Weevil and the Proper Timing of Fall Insecticide Applications1

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The amount of fall oviposition of the alfalfa weevil, Hypera postica (Gyllenhal), in alfalfa fields in New York and the relative importance of fall-laid and overwintering eggs as compared with spring-laid eggs were investigated over a 2-year period. These data were used to determine the proper timing of fall insecticide applications for the most effective control. The percentage of successfully overwintering eggs was found to vary according to field location, snow cover, severity of winter, and alfalfa conditions. Early-spring larval populations were found to be significantly correlated with the number of eggs per stem collected during the previous winter. There was no correlation between December-collected eggs and the number of larvae sampled during late spring. Late-fall applications were perhaps most effective either because the)' controlled the fall population of adults that might have resumed position in the spring, or because the residues were still sufficient in the spring to reduce the adults and larvae that were active then.

Document Type: Research Article

Publication date: April 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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