Acaricide Resistance in Tetranychus Urticae Koch Populations of Grapevine Orchard in Northern Karnataka, India

Abstract

Patil CM, Udikeri SS and Karabhantanal SS

Studies on Tetranychus urticae Koch population from grapevine orchard in Northern Karnataka resistance to major acaricides viz., dicofol 18.5 EC, fenpyroximate 5 SC, diafenthiuron 50 SC, sulphur 80 WP, abamectin 1.9 EC, hexythiazox 5.45 EC, spiromecifen 240 SC, propargite 57% EC, ethion 50 EC, fenazaquin 10% EC. Acaricidal resistance to sulphur 80 WG was highest with LC50 of 17769 ppm for field population and 651 for laboratory susceptible culture. The resistance ratio for sulphur was 27.30. The least resistance ratio of 4.45 folds was observed for fenazaquin 10% EC for which field and laboratory susceptible populations have exhibited LC50 of 44.62 ppm and 9.57 ppm, respectively. Based on the resistance co efficient use of sulphur appeared risky with high level of resistance. Propargite 57% EC, dicofol 18.5 EC and fenazaquin 10% EC have been classified as chemicals with low level of resistance for grape mites.

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