Author(s): Ghodake RD, Hole UB, Kharbade SB, Bagde AS and Galande SM

Abstract: A field experiment was conducted at the research farm in RCSM College of Agriculture, Kolhapur, during the summer 2022-23. The experiment followed a randomized block design with three replications and included eight treatments: T₁- Metarhizium anisopliae @ 6 g/L, T₂- Beauveria bassiana @ 6 g/L, T₃ -Lecanicillium lecanii @ 4 g/L, T₄- B thuringiensis @ 2 ml/L, T₅ -Spinosad @ 0.4 ml/L, T₆-Azadirachtin @ 1500 ppm, 5 g/L, T₇- Heterorhabditis indica @ 10 g/L and T₈ -untreated control. The objective was to study the efficacy of bio-rational pesticide for management of Leucinodes orbonalis Guenee, infesting brinjal. Three sprays were applied at 21 day intervals and data on shoot and fruit infestation, recorded at each spraying and picking, included the per cent of shoot infestation. The results revealed that the initial population of the pest before the spray indicated a non-significant distribution. However, after spray, the result revealed that the T₅ -Spinosad @ 0.4 ml/L was found to be a significantly effective treatment against shoot and fruit borer, which was comparable to T₆-Azadirachtin @ 1500 ppm, at 3, 7, and 14 days post-spraying Following closely in efficacy were B thuringiensis and Metarhizium anisopliae. The highest cost benefit ratio was recorded- T₅-spinosad @ 0.4 ml/L, followed by T₆-Azadirachtin @1500 ppm. The highest incremental cost-benefit ratio (ICBR) were recorded- T₄ -Bacillus thuringiensis @ 2 ml/L followed by T6-Azadirachtin @1500 ppm i.e Spinosad > Azadirachtin at 1500 ppm > B thuringiensis > Metarhizium anisopliae > Beauveria bassiana > Lecanicillium lecanii > Heterorhabditis indica > Untreated control

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