Management of sucking insect pest complex of Bt cotton by using dinotefuran – A 3rd generation neonicotinoid molecule

Abstract

Studies on the bioefficacy of dinotefuran 20 per cent SG was carried out against Bt cotton sucking pests at 15, 20, 25 and 30 g a.i/ha as compared with standard check viz., imidacloprid 17.8 SL and thiamethoxam 25 WG. Effect of treatments at 3, 7, 10 and 14 days after application differed significantly over untreated control and standard checks. At 3 days after treatment, dinotefuran 20 per cent SG @ 30 g a.i/ha performed significantly superior by recording lowest population of 1.47, 4.72, 9.10 and 0.30 leafhopper, thrips, aphids and whitefly/leaf, respectively. As the observation period progressed the pest populations though started building up, the test compound kept the sucking pest population below ETL up to 14 days. This trend was followed same in second spray also. The chemical dinotefuran 20 per cent SG @ 30 and 25 g a.i/ha dosages did not cause adverse effect on predatory population and recorded highest yield of 27.04 and 24.33 q/ha, respectively.