Dichlorvos and Gardona as Protectants for Stored Wheat Against Granary Weevil1 Infestations in Laboratory Studies2

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Laboratory studies were conducted to determine the relative effectiveness of Gardona® (2-chloro-1- (2,4,5-trichlorophenyl) vinyl dimethyl phosphate) and dichlorvos applied separately and in combination to protect stored hard red winter wheat subjected to an infestation by Sitophilus granaries (L.)

Effective control (95-100% mortality) of the adult weevils was obtained with a 20-day exposure to 8 ppm Gardona applied to the wheat or a minimum of 10-days' exposure to 15 ppm Gardona. Dichlorvos at 2 ppm and a weevil exposure period of 5 days also provided effective control. Gardona at 15 or 20 ppm reduced weevil reproduction significantly, while dichlorvos at 4 ppm inhibited reproduction. In general, the Gardona-dichlorvos mixtures were more effective as the percent of dichlorvos was increased.

Document Type: Research Article

Publication date: October 1, 1972

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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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