Effect of different microbial insecticides against pod borer complex of pigeonpea
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Date
2022-11-30
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Vasantrao Naik Marathwada Krishi Vidyapeeth, Parbhani
Abstract
Studies on effect and residual toxicity of different microbial insecticides against pigeon pea pod borer complex were conducted at Department of Agricultural Entomology, College of Agriculture, Latur (VNMKV, Parbhani) during Kharif 2021.
During the investigation, all the microbial insecticides were found significantly superior in recording minimum number of larvae of pod borer (Helicoverpa armigera) and plume moth (Exelastis atomosa) over untreated control. Among different microbial insecticides HaNPV, Bacillus thuringiensis var. kurstaki (Bt) and Metarhizium anisopliae 1.15% WP exhibited highest efficacy against pod borer (H. armigera), Bacillus thuringiensis var. kurstaki (Bt) and Metarhizium anisopliae 1.15% WP exhibited highest efficacy against spotted pod borer and plume moth (E. atomosa). Analogously, Bacillus thuringiensis var. kurstaki (Bt), Metarhizium anisopliae 1.15% WP and Nomuraea rileyi 1.15% WP revealed lowest pod and grain damage due to pod borer and plume moth whereas, Metarhizium anisopliae 1.15% WP, Bacillus thuringiensis var. kurstaki (Bt) and Nomuraea rileyi 1.15% WP registered minimum pod and grain damage due to pod fly. Significantly highest grain yield was achieved in Bacillus thuringiensis var. kurstaki (Bt) (17.31 q per ha) followed by Metarhizium anisopliae 1.15% WP (15.11 q per ha) and Nomuraea rileyi 1.15% WP (14.38 q per ha). Based on incremental cost
benefit ratio Metarhizium anisopliae 1.15% WP (1:7.14) and Nomuraea rileyi 1.15% WP (1:6.58) were found to be effective and economical.
Residual toxicity and persistence studies of different insecticides against pod borer (H. armigera) showed highest PT and LT50 values in HaNPV and Bacillus thuringiensis var. kurstaki (Bt) and for pod fly (M. obtusa) highest PT and LT50 values found in Bacillus thuringiensis var. kurstaki (Bt) and Metarhizium anisopliae 1.15% WP. Residual toxicity of these insecticides declined with lapse of time and provided prolong protection up to 14 days. Results of these studies will be used as a basis for selection of label claimed insecticides for successful control of pod borer (H. armigera) and pod fly (M. obtusa).