Bio-efficacy of chlorpyriphos 20ec against leaf miner, Phyllocnistis citrella Stainton in citrus

Abstract

Field experiments were conducted to evaluate the bioefficacy of chlorpyriphos 20 EC as foliar application against leaf miner in citrus with two rounds of chlorpyriphos 20 EC @ 250, 500, 750, 1000 ml/ha, Dursban 20 EC (standard check) 500 ml/ha and dimethoate 30 EC @ 500 ml/ha applied at the initiation of new flush followed by the second spray 14 days later. The mean leaf damage was the lowest (9.18%) in plots that received chlorpyriphos 20 EC 1000 ml/ha followed by chlorpyriphos 20 EC 750 ml/ha (9.39%), chlorpyriphos 20 EC 500 ml/ha (9.86%) and Dursban 20 EC 500 ml/ha (11.84%). Reduction in damage over control was maximum due to chlorpyriphos 20 EC 1000 ml/ha (63.21%) and chlorpyriphos 20 EC 750 ml/ha (62.40%).This was followed by chlorpyriphos 20 EC 500 ml/ha (60.47%), Dursban 20 EC 500 ml/ha (58.59%), dimethoate 30 EC 500 ml/ha (52.41%) and chlorpyriphos 20 EC 250 ml/ha (50.54%).