Field evaluation of insecticides against gallmidge infesting rice

Abstract

Field trials were conducted to evaluate the bio efficacy of granular and foliar spray recommended insecticides against gallmidge infesting rice both at nursery and transplanted crop. The insecticides both in form of granular and foliar application were evaluate in sole and combinations for four successive seasons i.e., rabi 2016-17, kharif 2017, rabi 2017-18 and kharif 2018. The results inferred that among all the insecticides, carbofuran 3G applied at 10 DAS and 10 DAT had recorded significant per cent reduction of gallmidge infestation over control with 48.3, 60.8 and 67.8 per cent at 35, 45 and 55 DAT during rabi 2016-17, respectively. Similarly, during kharif, 2017 and rabi, 2017-18 also carbofuran 3G registered highest per cent reduction of gallmidge infestation over control with 67.7, 68.0 & 60.19 and 65.6, 72.9 & 77.6 per cent at 30, 40 and 50 DAT, respectively. The foliar application of insecticides at 10 DAT also exhibited superior efficacy over control in suppressing the gallmidge infestation during rabi 2016-17, kharif 2017 and rabi 2017-18 and hence, during kharif, 2018 reassessed the efficacy of various insecticides in combinations and the results indicated that the plots treated with carbofuran 3G at 10 DAS and chlorpyriphos 20 EC at 10 DAT had recorded least pest infestation of 3.5, 4.5 & 3.0 per cent silver shoots with 82.1, 78.2 & 86.8 per cent reduction over control at 30, 40 and 50 DAT, respectively.