Author(s): A. GHOSAL, M. L. CHATTERJEE AND A. BHATTACHARYYA

Abstract: An experiment was conducted to observe the efficacy of some neonicotinoids against aphid of okra during pre- kharif season of 2010 and 2011 at Instructional Farm, Bidhan Chandra Krishi Viswavidyalaya. Imidacloprid 17.8 SL @ 50 g a.i. ha-1 was found as a most effective neonicotinoid insecticide against aphid. It recorded least aphid infestation and 84.54 % reduction of population over control. To control aphid population of okra the other two neonicotinoids viz., thiamethoxam 25WG @ 50 g a.i. ha-1 and acetamiprid 20SP @ 40 g a.i. ha-1 were also found at par with imidacloprid and showed better result than acephate 75WP and dimethoate 30EC. Considering incremental cost benefit ratio acetamiprid 20SP @ 40g a.i. ha-1 was found most economic over other neonicotinoids. None of the neonicotinoids have adverse effect on natural enemies of aphid in okra ecosystem.

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