Author(s):

DG Chaudhari, SD Patil, AS Mahale and RV Datkhile

Abstract: Field experiment on Efficacy of biopesticides and chemical insecticides against tobacco leaf eating caterpillar Spodoptera litura (Fab.) of soybean was conducted during kharif season of 2019 on soybean crop at College of Agriculture, Dhule. The present investigation was carried out with an object to study bioefficacy of biopesticides and chemical insecticides against tobacco leaf eating caterpillar Spodoptera litura (Fab.) of soybean. Mean larval population of tobacco leaf eating caterpillar after three, seven and fourteen days after sprays revealed that all the treatments were significantly superior over untreated control. The average number of leaf eating caterpillar larvae/mrl ranged from 4.34 to 7.89, 2.06 to 6.34 and 2.17 to 5.61 among the chemical insecticidal and bio pesticidal treatments as against 9.78, 9.78 and 10.67 in untreated control at 3, 7 and 14 days after spray, respectively. At three days after spray, flubendamide 39.35 SC @ 100 ml/ha was found significantly most effective against tobacco leaf eating caterpillar population (4.34/mrl) and was at par with chlorantraniliprole 18.5 SC @ 150 ml/ha (4.61/mrl) and spinosad 45 SC @ 250 ml/ha (4.72/mrl) and emamectin benzoate 5 SG @ 200 g/ha (5.23/mrl) and Spodoptera litura Nuclear Polyhydral Virus (SlNPV) 1 x 10⁹ POB/ml @500 ml/ha (5.61/mrl). At seven days after spray, spinosad 45 SC @ 250 ml/ha was found most effective treatment against tobacco caterpillar and recorded minimum number of average tobacco caterpillar population (2.06/mrl) and was at par with chlorantraniliprole 18.5 SC @ 150 ml/ha (2.11/mrl) and flubendamide 39.35 SC @ 100 ml/ha (2.39/mrl), and Spodoptera litura Nuclear Polyhydral Virus (SlNPV) 1 x 10⁹ POB/ml @500 ml/ha (3.50/mrl). At fourteen days after spray, chlorantraniliprole 18.5% SC @150 ml/ha and Spinosad 45 SC @ 250 ml/ha were found most effective treatment against tobacco caterpillar and minimize tobacco caterpillar population (2.17/mrl) and was at par with flubendiamide 39.35% SC @100ml/ha (3.11/mrl) and emamectin benzoate 5 SG @ 200 g/ha (3.11/mrl). Among the treatments of biopesticides, the treatment with Spodoptera litura Nuclear Polyhydral Virus (SlNPV) 1 x 10⁹ POB/ml @ 500 ml/ha effectively controlled the population of tobacco leaf eating caterpillar recorded significantly minimum of 5.61, 3.50 and 4.28 number of larvae/mrl at 3, 7 and 14 days after spray. The insecticidal and bio pesticidal treatments gave significantly higher soybean grain yield over untreated control. Significantly maximum grain yield of 26.73 q/ha was recorded in plot treated with insecticidal spray of chlorantraniliprole 18.5 SC @ 150 ml /ha over untreated control (11.67 q/ha). However, it was at par with flubendamide 39.35 SC @ 100 ml/ha (26.01 q/ha), spinosad 45 SC @ 250 ml/ha (25.89 q/ha) and emamectin benzoate 5 SG @ 200 g/ha (22.27 q/ha) followed by quinalphos 25 EC 1000 ml/ha (21.27 q/ha), ), Bt – Bacillus thuringiensis var. kurstaki 0.5%WP @ 500 g/ha (18.00 q/ha), Spodoptera litura Nuclear Polyhydral Virus (SlNPV) 1 x 10⁹ POB/ml @500 ml/ha (17.51 q/ha) and NSE (Neem seed extract) 5% (16.05 q/ha).

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