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

Abstract: In the summer of 2022-23, a field experiment was conducted at the research farm in RCSM College of Agriculture Kolhapur, employing a randomized block design with three replications and encompassing eight treatments: T₁ - Metarhizium anisopliae @ 6 g/L, T₂ - Beauveria bassiana @ 6 g/L, T₃ - Lecanicillium lecanii @ 4 g/L, T₄ - Bacillus 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 assess the efficacy of bio-rational pesticides for managing Leucinodes orbonalis Guenee infestations in brinjal. Three sprays were applied at 21days intervals, recording data on shoot and fruit infestation at each spraying and picking, including the percentage of fruit infestation. The initial pest population before the spray showed a non-significant distribution. However, post-spray, T₅ - Spinosad @ 0.4 ml/L proved significantly effective against shoot and fruit borers, comparable to T₆ - Azadirachtin @ 1500 ppm at 3, 7, and 14 days post-spraying. Following closely in efficacy were Bacillus thuringiensis and Metarhizium anisopliae. The highest cost-benefit ratios were recorded for T₅ - Spinosad @ 0.4 ml/L, followed by T₆ - Azadirachtin @ 1500 ppm. The highest incremental cost-benefit ratios (ICBR) were recorded for T₄ - Bacillus thuringiensis @ 2 ml/L, followed by T₆ - Azadirachtin @ 1500 ppm, i.e., Spinosad > Azadirachtin at 1500 ppm > Bacillus thuringiensis > Metarhizium anisopliae > Beauveria bassiana > Lecanicillium lecanii > Heterorhabditis indica > untreated control.

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