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IMPACT OF NEWER INSECTICIDES ON LADYBIRD BEETLES (MENOCHILUS SEXMACULATUS L.) IN HYBRID COTTON

Abstract

The experiment was carried out at Field of Department of Agricultural Entomology, College of Agriculture, Dhule (Maharashtra) during Kharif season 2011-2012 to study the effect of 8 newer insecticides on lady bird beetles in cotton crop. The experiment was laid out in a randomized block design (RBD) with nine treatments (8 insecticide treatments+1 untreated control) replicated thrice. Eight insecticides viz. Imidacloprid 17.80 SL, Fipronil 5 SC, Thiamethoxam 25 WG, Imidacloprid 70 WG, Triazophos 40 EC, Acetamiprid 20 SP, Fipronil 80 WG, Lambda cyhalothrin 5 SC were tested to suppress sucking pests in cotton. The activity of natural enemies, such as ladybird beetle population on the sucking pests attacking Bt cotton hybrid cultivar RCH-2 BG-II were recorded. Ladybird beetles (Menochilus sexmaculatus L.) were abundant in the field but their population decreased in the treated plots as compared to untreated control. Mean population of lady bird beetle per plant was more in untreated control (1.51 ladybird beetles /plant) and statistically was non-significant. In case of different insecticide treatments lambda cyhalothrin 5 SC (0.96 ladybird beetles /plant) and imidacloprid 17.80 SL (0.92 ladybird beetles /plant) were found ecofriendly.

D.V. SANER, G.B.KABRE AND Y.A. SHINDE

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