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Bioassay Evaluation of Heptachlor, Isobenzan, and Diazinon Used Against the Alfalfa Weevil in Northern Utah

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Beginning about 1952, both heptachlor and dieldrin were widely and successfully used in alfalfa weevil, Hypera postica (Gyllenhal), control in Utah. The preferred timing of insecticide applications was during early spring. In 1961 these controls failed in a large area of northern Utah. By 1962 the areas in which controls failed Were much larger. During 1962 and 1963 weevils from these fields were sent to the Entomology Research Division, Agr. Res. Serv., USDA, Beltsville. Md., for examination. Adler and Blickenstaff (1964) reported that about 3000 times the dosage of heptachlor was required to reach an LD20, as was required for the eastern alfalfa weevil. An LD50 could not be obtained.

Document Type: Research Article

Publication date: December 16, 1968

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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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