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Effect of Weather on the Toxicity and Persistence of Some Insecticides on Alfalfa Foliage1

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Field and laboratory experiments were conducted during 1968 to determine the effect of weather on insecticidal control of the alfalfa weevil, Hypera postica (Gyllenhal). Tests conducted under what were considered highly favorable weather conditions for insecticide activity were compared with extreme conditions. Generally best results were obtained with methyl parathion. A mixture of malathion-methoxychlor was more effective under each temperature condition ranging from 55 to 85°F and various amounts of rain than either of the 2 materials used alone. Malathion and phorate were greatly affected by low temperature and rain following application. Generally most materials performed poorly with the adverse conditions of 55°F and wet foliage followed by rain 1 hour after application and each day for 5 days. Control results were better when the first rain after application occurred at 8 hours.

Document Type: Research Article

Publication date: February 1, 1970

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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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