Effect of different insecticides against aphids, Aphis gossypii and whiteflies, Bemisia tabaci

Abstract

Investigation on different insecticides against sucking pests of cotton like, aphids and whiteflies were carried out during 2016-17 in farmer field Kommanalu village, Shivamogga. The result raveled that, aphids population was recorded least in dinotefuron 20 SG @ 0.3g/ l (8.69 aphids/ 3 leaves), imidacloprid 17.8 SL @ 0.25 ml/ l (6.99 aphids/ 3 leaves) imidacloprid 70 WG @ 0.25g/ l (2.96 aphids / 3 leaves) and dinotefuron 20 SG @ 0.3g/ l (2.21 aphids/ 3 leaves) were most effective treatments in reducing incidence of aphids on Bt cotton as compared to other chemicals. However, the lowest population of whiteflies was recorded least in imidachloprid 17.8 SL @ 0.25 ml/ l (5.71 whiteflies / 3 leaves), thiamethoxam 25 WG @ 0.25g/ l (3.88 whiteflies /3leaves) and imidachloprid 17.8 SL @ 0.25 ml/ l (1.88 whiteflies / 3 leaves). Were effective chemical against cotton whiteflies.