Determination of susceptibility and resistance of

Authors: Recep Ay

Publish Date: 2005/02/16

Volume: 78, Issue: 3, Pages: 139-143

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Abstract

The level of susceptibility of the twospotted spider mite Tetranychus urticae Koch populations collected from greenhouses in Antalya and Isparta regions of Turkey against chlorpyrifos was determined by a petri dish bioassay method This study consisted of two stages In the first stage using a diagnostic dosage 0026 ml chlorpyrifos in 100 ml distilled water it was determined whether these populations are resistant or susceptible to chlorpyrifos Then different dosages of chlorpyrifos were applied to resistant populations to determine LC50 and LC90 values Resistant ratios of populations were calculated by dividing the LC50 values of resistant populations by that of a susceptible population of T urticae strain GSS The resistance ratio of T urticae populations collected from greenhouses ranged from 800 to 177400 Results show that while three of the populations gathered from the Isparta region where greenhouse vegetable growing has been increasing since 2000 are susceptible two of them are only partially resistant to chlorpyrifos On the other hand all the twospotted spider mite populations collected from the Antalya region the centre of greenhouse vegetable production for many years were found to be highly resistant to chlorpyrifosThis project TOGTAG2968 is partly supported by the Scientific and Technical Research Council of Turkey The authors wish to thank Dr Philippe Auger of ENSAM/INRA France for the identification of T urticae and Dr Bayram Cevik for critically reading the manuscript and for suggestions which improved the language

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