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The reduction in the susceptibility to deltamethrin and chlorpyriphos-ethyl of 13 populations of Typhlodomus pyri collected in vineyards in the Midi-Pyrénées region of France was demonstrated under laboratory conditions. The corrected mortality ranged from low to medium in all but one population, which was very susceptible to deltamethrin. This reduced toxicity of deltamethrin and chlorpyriphos-ethyl...
Since 2000, two predatory mites, Typhlodomus pyri and Amblyseius andersoni, have been found in Frontonnais and vineyards in the Midi-Pyrénées region of France, where pyrethroids and organophosphate insecticides were applied. Laboratory studies have confirmed resistance in the two species to deltamethrin, lambda-cyhalothrin and chlorpyriphos-ethyl. Resistance ratios ranged from medium to high. This...
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