Black Vine Weevil: Resistance to Dieldrin and Sensitivity to Organophosphate and Carbamate Insecticides12

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Abstract
Spray tower application of 0.1% dieldrin killed all adults of Otiorhynchus sulcatus (F.) from populations in Oregon and Washington and from one Ohio population, while a 1.0% concn killed only a few adults from a 2nd Ohio population. Carbofuran (0.05%) applied by a spray tower killed all weevils from the resistant Ohio population, whereas fensulfothion and carbaryl were relatively nontoxic at the same concentration.

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