Author(s):

Ramalakshmi V, Lipsa Dash and Deepayan Padhy

Abstract: Estimation of yield losses and Field efficacy of novel insecticides against leafhoppers on transgenic cotton were assessed during kharif 2011. Estimation of yield losses due to, leafhoppers, in RCH-2BG-II, RCH-2NBt, Tulasi-9BG-II and Tulasi-9NBt under protected and unprotected conditions was done with eight treatments and three replications in Factorial Randomized Block Design. RCH-2 was susceptible and Tulasi-9 was tolerant hybrid against leafhoppers. Among the treatments; Tulasi-9 NBt recorded lowest yield loss (13.13%) and RCH-2NBt recorded highest yield loss (19.99%) followed by Tulasi-9 BG-II and RCH-2 BG-II. The bioefficacy of certain novel insecticides against leafhopper recorded Fipronil 5% SC @50g a.i. ha^-1 and fipronil 80% WG @50g a.i. ha^-1 were effective in managing leafhopper with a population reduction of 70.9% and 67.6%, respectively.

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