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Chemical Control of the Alfalfa Weevil in Illinois and Indiana1 I. Comparison of Registered and Experimental Materials

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Field and laboratory experiments were conducted during 1967 to determine the effectiveness of registered and experimental insecticides and mixtures of various insecticides for controlling Hypera postica (Gyllenhal) on first crop alfalfa in southern Indiana and Illinois. Tests were conducted under what were considered both highly favorable and unfavorable weather conditions for insecticide activity. Of the registered materials tested, best results were obtained with methyl parathion. Control results with a mixture of malathion and methoxychlor also were impressive. Early in the season when weather conditions were most favorable phorate appeared to give more persistent control than did methyl parathion.

A laboratory bioassay of field-applied chemical sprays showed that most materials tested resulted in a lower larval mortality at 50 than at 72. Methyl parathion, Baygon (o-isopropoxyphenyl methylcarbamate), and Furadan® (2, 3-dihydro-2,2-dimethyl-7-benzofuranyl methylcarbamate) did not appear to be affected significantly by temperature; on the other hand, methoxychlor and in some cases Alfatox® (1.6 lb methoxychlor +0.8 lb diazinon per gallon) gave greater larval mortality at 50 than at 72.

Document Type: Research Article

Publication date: August 1, 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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