Dichlorvos and Gardona as Protectants for Stored Wheat Against Granary Weevil Infestations in Laboratory Studies12

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Abstract
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.

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