Author(s): A. GHOSAL, A. K. DOLAI, M. L. CHATTERJEE

Abstract: Brown plant hopper and white backed plant hopper emerged as the major sucking pest due to selection pressure. Being having potent adaptability to develop resistance against sole insecticides it is a present demand to formulate a mix formulation with different target specificity. Field experiments were conducted during boro season of 2012 and kharif season of 2013 in experimental plots of Bidhan Chandra Krishi Viswavidyalaya, West Bengal to evaluate the efficacy of ready mixed insecticide (buprofezin 15% +acephate 35% WP) @ 1000, 1250 and 1500 ml ha-1 against BPH (Nilaparvata lugens) and WBPH (Sogatella furcifera) of Rice. Buprofezin 15% + acephate 35% WP @ 1500 ml ha-1 was found as best effective insecticide against BPH and WBPH during both experimental seasons with highest reduction against the test insects. It was found that buprofezin 15% + acephate 35% WP @ 1500 ml ha-1 showed tremendous result over other treatments. No population of brown plant hopper was recorded after 10 days of second spray during boro season of 2012, while during kharif of 2013 only 4.33 nos. of brown plant hopper was recorded during 10 days after second spray, and no infestation was recorded from 5 days after third spray. Similarly in case of WBPH buprofezin 15% + acephate 35% WP @ 1500 ml/ha also recorded no infestation from 5 days onwards after third spray. The pre mix formulation of buprofezin 15% + acephate 35% WP @ 1500 ml ha-1 showed potentiation over the sole effect of acephate and buprofezin

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