Resistance to bifenthrin and resistance mechanisms of different strains of the two-spotted spider mite (Tetranychus urticae) from Turkey |
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Authors: | Recep Ay M Oktay Gürkan |
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Institution: | (1) Plant Protection Department, Faculty of Agriculture, Süleyman Demirel University, 32260 Isparta, Turkey;(2) Plant Protection Department, Faculty of Agriculture, Ankara University, 061110 Ankara, Turkey |
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Abstract: | Nine different strains of the two-spotted spider miteTetranychus urticae Koch (Acari: Tetranychidae) were collected on cotton from Adana, Antalya, Izmir, Manisa and Urfa in Turkey. Their responses
to bifenthrin were investigated using conventional bioassay and biochemical assays. LC50 and LC90 values of bifenthrin were determined for all strains by using a residual bioassay with a petri dish-spray tower. Resistance
ratios were determined by comparing the samples with a standard susceptible strain, GSS. The resistance ratios of the strains
ranged from <1 to 669-fold (at LC50). Of the investigated field strains, only three (two from Adana and one from Urfa) were resistant to bifenthrin. There was
a correlation between esterase enzyme activity and bifenthrin resistance according to polyacrylamide gel electrophoresis and
microtiter plate assays in the three resistant strains.
http://www.phytoparasitica.org posting May 17, 2005. |
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Keywords: | Tetranychus urticae two-spotted spider mite resistance bifenthrin esterase cotton |
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