2010•Indian Journal of EntomologyRequires access

Persistence and residual insecticidal toxicity against Earias vittella.

S.T. Shinde, S.S. Shetgar, NP Pathan

Abstract

Six insecticides were evaluated for their persistence and residual toxicity against first and third instar larvae of E. vitella on okra. On the basis of PT values spinosad 0.005% (1026.2) and on LT50 values cypermethrin 0.01% (10.41 days) were found effective against first instar larvae. However, PT and LT50 values for 1.59 and 14.74 days, respectively were observed due to spinosad 0.005% against first instar larvae of on okra fruits. The highest PT value was obtained for spinosad 0.005% (764.9) while the highest LT50 value was recorded profenofos 0.08% (6.07 days) against third instar larvae on okra fruits.

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Key concepts: Spinosad, Instar, Biology, Toxicology, Larva, Cypermethrin, Persistence (discontinuity), Toxicity