Evaluation of botanical and other extracts against plant hoppers in rice

Abstract

A field experiment was conducted to determine the comparative efficacy of ten botanical leaf aqueous extracts, panchagavya, acephate as standard check and untreated control against hoppers in rice during kharif 2009-2010 and 2010-2011.The treatments include: Aqueous leaf extract of Vitex, Pongamia, Custard, Calotropis at 5 and 7.5% concentration, Neem Seed Kernel Extract (NSKE) at 5 and 7.5% concentration, panchagavya at 5 and 7.5% concentration, acephate 75%SP @ 1.5 g/lt and untreated control. The cumulative data reveals that the standard check-Acephate 75 SP @ 1.5 g/lt recorded significantly higher mean % reduction of hoppers and higher grain yield over all the other treatments. Among the botanical extracts, NSKE at 7.5% concentration recorded higher efficacy against hoppers by recording 49.4% mean reduction with a mean grain yield of 4775 kg/ha and found to be at par with some of the other botanical extracts. The Panchagavya and Custard leaf extracts at both the concentration shown significantly lower efficacy. Except Acephate and NSKE at 7.5% concentration, all the other treatments were found to be at par with each other in terms of grain yield.