author(s)
MM Godase, YS Saindane, BV Deore, US Surve and ST Aghav

abstract
An experiment entitled “Biorational management of insect pest of soybean (Glycine max)” was conducted at the Post Graduate Research Farm, Department of Entomology, Mahatma Phule Krishi Vidyapeeth, Rahuri, Dist: Ahmednagar (Maharashtra) during Kharif, 2023. During the course of study, Eight treatments viz., Metarhizium anisopliae 1.15% WP @ 5.0 g/L, Beauveria bassiana 1.15% WP @ 5.0 g/L, Bt var. kurstaki @ 2.0 g/L, Azadirachtin 10000 ppm @ 2.0 ml/L, Neem oil @ 2.0 ml/L, Pongamia oil @ 2.0 ml/L, Intercrop with sorghum (2:1), Trap crop- Castor and standard check Chlorantraniliprole 18.5% SC with untreated control were evaluated in Randomized Block Design (RBD) with three replications during Kharif, 2023. The observations on leaf eating caterpillar (Spodoptera litura), green semilooper (Chrysodeixis acuta), whitefly (Bemisia tabaci), aphid (Aphis craccivora), leaf hopper (Empoasca spp.), stem fly (Melanagromyza sojae) and girdle beetle (Obereopsis brevis) were recorded. While, incidence of pests other than leaf eating caterpillar and green semilooper was recorded minimum. So, observations recorded with leaf eating caterpillar (Spodoptera litura), green semilooper (Chrysodeixis acuta) causes severe damage to soybean crop. The observations on leaf eating caterpillar (Spodoptera litura), green semilooper (Chrysodeixis acuta) for evaluation of bioefficacy of different biorationals were recorded a day before initiation of treatment application and at 3rd, 7^th and 10th days after each spray. Two sprays were given at 15 days interval. The results on evaluation of bioefficacy of biorationals against leaf eating caterpillar (Spodoptera litura) and semilooper (Chrysodeixis acuta) revealed that, the standard check chlorantraniliprole 18.5% SC consistently proved to be most promising by recording least population (2.23 larvae/mrl). Among biorationals Beaveria bassiana 1.15%WP (1x10⁸ cfu/g) with (3.00 larvae/mrl) and Metarhizium anisopliae 1.15% WP (1x10⁸ cfu/g) with (3.05 larvae/mrl) were found most effective and at par with each other in control of leaf eating caterpillar (Spodoptera litura) population over untreated control. Whereas, pongamia oil (4.60 larvae/mrl), intercrop- sorghum (4.65 larvae/mrl) and trap crop- castor (4.71 larvae/mrl) was found least effective treatments in control of leaf eating caterpillar (Spodoptera litura).