Vol. 10, Special Issue 8 (2021)

Author(s):
Shubham, Ram Batuk Singh, Kripa Shankar, Ashutosh Upadhyay and Pooshpendra Singh Dixit

Abstract:
The experiment were conducted to observe the seasonal abundance of L. orbonalis in relation to abiotic factors (temperature, relative humidity, rainfall etc.), to evaluate the efficacy of some commonly used insecticides against brinjal shoot and fruit borer L. orbonalis on brinjal crop in kharif 2018-19. Result showed that the population of L. orbonalis appeared on 4^th week of August (0.20 larvae/plant) i.e. 35^th Standard Meteorological Week (SMW) & reach its peak (14.5 larvae/plant) during 43^rd SMW i.e. last week of October. The pest population suddenly decreased (0.2 larvae/plant) in the last December i.e. 52^nd SMW due to the reason that no more leaves & twigs were produce. Regarding efficacy of insecticide Emamectin benzoate 5%SG @ 200g a.i./ha prove most effective which are closely followed by Flubendamide 48SC @ 75 ml/ha & Dimethoate 30 EC @ 1 lit/ha. Obviously maximum fruit yield i.e. 227.18 q/ha was given by Emamectin benzoate 5%SG which was closely followed by Flubendamide 48SC & Dimethoate 30EC. ICBR of Emamectin benzoate 5%SG 1: 31.06 was maximum. Similar trend in percent increase yield over control was observed in this investigation.