Efficacy of microbial and chemical pesticides against wheat aphid (Rhopalosiphum padi L.)

Abstract

Field experiment on Efficacy of microbial and chemical pesticides against wheat aphid (Rhopalosiphum padi L.) was conducted during rabi season of 2018-19 on wheat crop at Agricultural Research Station, Niphad, Dist. Nasik. The present investigation was carried out with an object to study the efficacy of biopesticides and chemical insecticides against wheat aphid (R. padi) at alone and its alternate application, to identify highly effective biopesticides and chemical insecticides schedules for the management of wheat aphid Studies on efficacy of microbial and chemical pesticides against wheat aphid revealed that among the treatment schedules of chemical insecticide followed by chemical insecticide, biopesticide followed by chemical insecticide and biopesticide followed by biopesticides, the most promising schedules were thiamethoxam 25 WG @ 50.0g/ha fb. thiamethoxam 25 WG @ 50.0g/ha and thiamethoxam 25 WG @ 50.0g/ha fb. diamethoate 30 EC @ 750ml/ha which significantly reduced the aphid population which recorded 0.00, 0.00 & 7.53 and 0.00, 0.00 & 8.23 number of aphid/shoot/plant at 3, 7 and 14 days after spray, respectively. Treatments schedule with Lecanicillium lecanii 1.15% WP @ 2.0 kg/ha fb. thiamethoxam 25 WG @ 50.0g/ha was the next promising treatments which recorded 10.07 number of aphid/ shoot/ plant on an average basis. It was at par with Metarhizium anisopilae 1.15% WP @ 2.0 kg/ha fb. thiamethoxam 25 WG @ 50.0g/ha (10.35).