COMPARATIVE POTENCY OF BIO-RATIONAL INSECTICIDES BASED IPM APPROACHES AGAINST TOMATO LEAF MINER (TUTA ABSOLUTA, MEYRICK) UNDER FIELD CONDITION

Abstract

Tuta absoluta (Meyrick), the tomato leaf miner, is one of the most key pests affecting tomato crops in Bangladesh and causes damage up to 90% yield loss, and very difficult to control. An open field research was conducted in the Arboriculture Centre, Bangladesh National Parliament, Sere Bangla Nagar, Dhaka, Bangladesh during December 2017 to April 2018 on the management of tomato leaf miner using ten selected bio-rational insecticide based IPM packages viz. Emamectin benzoate + removal of instead leaf & fruit, spinosad + removal of infested leaf & fruit, abamectin + removal of infested leaf & fruit, emamectin benzoate + abamectin, spinosad + buprofezin, abamectin + buprofezin, emamectin benzoate + lufenuron, buprofezin + removal of infested leaf & fruit, buprofezin + lufenuron and lufenuron + removal of infested leaf & fruit along with an untreated control. The experiment was laid out in Randomized Complete Block Design (BCBD) with three replications of each treatment. The effectiveness of IPM packages was evaluated based on following parameters namely percent leaf and fruit infestation, percent protection of leaf and fruit over control, marketable and infested fruit yield (t/ha), percent increase or decrease of marketable or infested fruit over control. All the IPM packages significantly reduced percent leaf and fruit infestation and significantly increased/decreased the marketable/infested fruit yield, respectively over untreated control at 7 days after spraying (DAS). Of different packages, the best results were observed in case of emamectin benzoate + removal of infested leaf & fruit (84.83% and 86.54% leaf and fruit, respectively protection over control; marketable fruit yield of 46.60 t/ha and 71.67% reduction of infested fruit yield over control) treated plot whereas the lowest protection was obtained from lufenuron + removal of infested leaf & fruit (34.95% and 37.33% leaf and fruit, respectively over control; marketable fruit yield of 26.49 t/ha and 11.36% reduction of infested fruit yield over control) treated plots. Therefore, emamectin benzoate + removal of infested leaf & fruit could be recommended as the IPM packages for the sustainable management of tomato leaf miner, Tuta absoluta.