Management of insect pests of sponge gourd under poly house conditions

Abstract

Insecticides viz., dichlorvos 76 EC (1ml/litre water), dimethoate 30 EC (1ml/litre water), imidacloprid 17.8 SL (0.45 ml/ litre water), imidacloprid 17.8 SL (0.3 ml/ litre water), imidacloprid 17.8 SL (0.15 ml/ litre water), chlorpyriphos 20 EC (1ml/litre water) and neem oil (2ml/litre water) were evaluated against white fly and melon aphid of sponge gourd under poly house conditions in 33rd and 35th standard week. Higher dose of imidacloprid 17.8 SL (0.45ml) was most effective in reducing population of white fly and melon aphid and increasing mortality (89.03% and 88.15%) after two sprays on sponge gourd respectively. Imidacloprid 17.8 SL (0.3ml) and dimethoate 30 EC (1ml) recorded mortality percentage of 75.21 and 75.05 (white fly) and 78.02 and 77.75 (melon aphid). These insecticides were at par with each other but significantly different from imidacloprid 17.8 SL (0.45 ml), dichlorvos 76 EC (1ml), chlorpyriphos 20 EC (1 ml), imidacloprid 17.8 SL (0.15 ml) and neem oil (2 ml) recorded mortality percentage 60.75, 54.73, 36.02 and 34.81 (white fly) and 69.58, 63.62, 45.88 and 36.60 (melon aphid), respectively. These treatments were significantly different from other treatments and were superior over control.