Bioefficacy of Different Insecticides Against Cotton Leafhopper, Amarasca biguttula biguttula (Ishada) under Field Condition

The field experiment were conducted at MARS, UAS, Dharwad in two successive crop seasons (kharif) during 2012 to 2013 with RCH-2Bt (cotton) to study the bioefficacy of different insecticides against cotton leafhopper, Amarasca biguttula biguttula (Ishada). Dinotefuran 20 SG (0.25g/l), fipronil 5 SC (1 ml/l), diafenthiuron 50 WP (0.75 g/l) and buprofeizin 25 EC (1ml/l) were found most effective against leafhopper with 79.57, 76.59, 76.23, and 73.69, per cent reduction over untreated check respectively. Further, these insecticide interventions found to be safe to the natural enemy activity as there was no significant variation among the treatments with respect to the natural enemies population (coccinelids, Chrysopa, Micromus and spiders). Hence, these insecticides can safely be included in IPM of cotton for sucking pests, which are increasing in trend.