Seasonal abundance of brinjal shoot and fruit borer, Leucinodes orbonalis (Guenee.) On brinjal, Solanum melongena (L.) And its management

Abstract

The experiments were conducted to observe the seasonal occurrence of Leucinodes orbonalis in relation to abiotic factors, and to assess the efficacy of few commonly used novel insecticides for the safer management of noxious insect, L. orbonalis on brinjal crop in kharif season 2012-13. L. orbonalis appeared in 2nd week of September (0.20 larvae/plant) i.e. 37th standard week and reached its peak (5.80 larvae /plant) during 49th standard week i.e. second week of December. The pest population suddenly decreased (0.40 larvae /plant) in last week of February i.e. 9th standard week due to the reason that no more new leaves and twigs were produced. Regarding the efficacy of insecticides Imidacloprid 17.8 SL @250 g a.i. /ha proved most effective closely followed by Indoxacarb 14.5 SC @50 g a.i. /ha and Dimethoate 30 EC @1 lit/ha. Maximum fruit yield i.e. (220.61q/ha.) was given by Imidacloprid 17.8 SL closely followed by Indoxacarb 14.5SC & Dimethoate 30 EC.