Evaluation of new insecticides and Acaricides against red spider mite (Tetranychus urticae Koch) In Ashwagandha (Withania somnifera Dunal)

Abstract

A field expriment was conducted at Kittur Rani Channamma College of Horticulture Arabhavi, Karnataka during kharif season of 2016 and 2017 to evaluate the bio efficacy of different insecticides and acaricides viz., acetamiprid 20 SP, thiamethoxam 25 WG, spiromesifen 240 SC, difenthiuron 50 WP, azadirachtin 1500 ppm, NSKE 5 per cent, dimethoate 30 EC and dicofal 18.5 EC against red spider mite, Tetranychus urticae Koch in Ashwagandha, Withania somnifera Dunal ecosystem. The results of study revealed that the acaricide spiromesifen 240 SC @ 1 ml/l was found most effective in reducing mites population (0.92 mites/3leaves/plant) followed by difenthiuron 50 WP @ 0.75 g/l (4.20 mites/3leaves/plant) and dicofal 18.5 EC @ 2.50 ml/l.(6.82 mites/3leaves/plant). The same treatment was found effective and registered highest root and seed yield (5.20 q/ha and 1.40 q/ha, respectively) and was followed by difenthiuron 50 WP @ 0.75 g/l (4.55 q/ha and 1.08 q/ha, respectively).