Grape Infesting Mite Tetranychus urticae Koch. Resistance to Acaricides
Grape Infesting Mite Tetranychus urticae Koch. Resistance to Acaricides
Chandragouda M. Patil, Shashikant S. Udikeri* and Shreeshail. S. Karabhantanal
ABSTRACT
Studies on resistance of Tetranychus urticae Koch population from grapevine orchard indicated considerable survival on dicofol 18.5 EC, fenpyroximate 5 SC, diafenthiuron 50 SC, sulphur 80 WP, abamectin 1.9 EC, hexythiazox 5.45EC, spiromecifen 240SC, propargite 57% EC, ethion 50EC, fenazaquin 10%EC treated leaves. Field populations had high degree of resistance to Sulphur 80WG with LC 50 of 17769.72 ppm against 651.17 ppm for a laboratory susceptible strain. Thus 27.30 fold resistance ratio was observed (RR) for sulphur. The least resistance ratio 4.45 fold was observed for fenazaquin 10% EC and the field and laboratory susceptible populations have exhibited LC 50 values of 44.62 ppm and 9.57 ppm, respectively. Based on the resistance co-efficient propargite 57% EC, dicofol 18.5% EC and fenazaquin 10% EC have been classified as chemicals with low level resistance having resistance.
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June 2020
Vol. 52, Iss. 3, Pages 825-1224
