Field Efficacy of Biopesticides and New Insecticides against Major Insect Pests and their Effect on Natural Enemies in Cauliflower

摘要

The experiment was laid out in a randomized block design for two rabi seasons (2005-2006) and (2006-2007) in the experimental field of Division of Entomology, IARI, New Delhi. Higher mean per cent reduction over control (PROC) was recorded against aphids 78.8 and 61.6 (imidacloprid 20 g ai ha~(-1)), 80.8 and 58.5 (thiamethoxam 75 g ai ha~(-1)) and, 77.8 and 51.8 (catlap hydrochloride 250 g ai ha~(-1)) after first and second spraying, respectively, during 2005-2006 and 80.8 and 68.2 (imidacloprid 20 g ai ha~(-1)), 79.8 and 61.2 (thiamethoxam 75 g ai ha~(-1)), and 78.5 and 50.9 (cartap hydrochloride 250 g ai ha~(-1)) after first and second spraying, respectively during 2006-2007. The mean of PROC recorded against DBM was 76.4 and 67.3 (spinosad 75 g ai ha~(-1)), 80.3 and 78.8, (emamectin benzoate 10 g ai ha~(-1)), 66.8 and 63.9 (cartap hydrochloride 250 g ai ha~(-1)) and 70.8 and 70.9 (indoxacarb 75 g ai ha~(-1)) after first and second spraying, respectively, during 2006-2007. The mean PROC recorded against cabbage butterfly was 78.7 and 57.7 (spinosad 75 g ai ha~(-1)), 75.8 and 45.5 (emamectin benzoate 10 g ai ha~(-1)), 71.5 and 43.4 (cartap hydrochloride 250 g ai ha~(-1)) and 84.4 and 64.2 (indoxacarb 75 g ai ha~(-1)) after first and second spraying, respectively, during 2005-2006 and 73.7 arid 68.6 (spinosad,75gai/ha), 76.2 and 75.3 (emamectin benzoate,10gai/ha),62.1and 61.3 (cartap hydrochloride,250gai/ha) and, 68.3 and 71.4 (indoxacarb,75gai/ha) after first and second spraying, respectively during 2006-2007. Spinosad, Biolep, emamectin benzoate and neem oil proved safer to natural enemies in the cauliflower ecosystem.