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Control of Hypera postica (Gyll.) on Second-Cuttig Alfalfa in New York1

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A total of 15 counties 'in New York is presently known to be infested by the alfalfa weevil,Hypera postica(Gyll.)(Curculionidae: Coleoptera). Larval feeding in 1958 was delayed on the first alfalfa cutting and resulted in injury to the second crop. Five replicated experiments were conducted in second-cutting fields in Dutchess, Orange, and Ulster Counties in which 15 insecticides were applied as low pressure, low volume sprays.

Heptachlor at 4 ounces actual material per acre gave excellent control of larvae for 32 days following application. Chlordane at 32 ounces and lindane and endrin each at 4 ounces per acre gave good larva] control for 2 weeks after treatment, while phosphorus- containing compounds gave effective larval control for slightly more than 1 week. Heptachlor applied at a rate of 8 ounces per acre gave good control of the alfalfa weevil adult for 2 weeks following application.

Document Type: Research Article

Publication date: August 1, 1959

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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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