Susceptibility of an organophosphate resistant strain of the two-spotted spider mite (<Emphasis Type="Italic">Tetranychus urticae</Emphasis>) to mixtures of bifenazate with organophosphate and carbamate insecticides |
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Authors: | Jahangir Khajehali Thomas Van Leeuwen Luc Tirry |
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Institution: | (1) Ghent University, Ghent, Belgium; |
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Abstract: | Bifenazate, a new and frequently used carbazate, is a pro-acaricide which needs to be activated by carboxylesterases. We evaluated
the possible antagonism of organophosphate and carbamate insecticides on bifenazate toxicity in Tetranychus urticae applied in mixtures. Two organophosphate resistant strains were used (WI and MR-VL) and several organophosphate (chlorpyrifos,
azinphosmethyl and phosmet) and carbamate (carbaryl and methomyl) insecticides were evaluated. Mixing chlorpyrifos with bifenazate
decreased bifenazate toxicity in both tested strains. However, in the strain with a higher esterase activity, antagonism decreased
after 2 days. Of all other tested chemicals, only methomyl displayed an antagonistic effect 1 day after treatment. These findings
indicate that mixing organophosphate and carbamate insecticides with bifenazate may inhibit bifenazate efficacy under field
conditions, especially when resistant strains are present. |
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