Bio-efficacy of bio-pesticides against tobacco caterpillar (Spodoptera litura. Fab) on cabbage

The present investigation was carried out during rabi season of 2019-2020 at Experimental farm in SHUATS, Prayagraj. The experiment was laid out in randomized block design with seven treatments viz., Beauveria bassiana (1.5kg/ha), Bacillus thuringiensis (1.5kg/ha), NSKE (25kg/ha), Neem oil (15lit/ha), Spinosad (96ml/ha), Indoxacarb (73ml/ha) and Contol (Water). The observations on larval population Spodoptera litura 3, 5, and 7 days after treatment at each spraying (1st and 2nd spray) were recorded for computing the percent larval reduction. The yield data of cabbage heads influenced by each treatment were also recorded. Among all the treatments in both sprays Spinosad 45 EC was most efficacious in reducing the larval population (56.20% and 78.03%) of Spodoptera litura. The treatment with Bacillus thuringiensis (54.17% and 74.58%) also performed well against the pest. Similarly, Beauveria bassiana (51.83% and 72.20%), Indoxacarb (53.20% and 71.67%), NSKE (42.70% and 65.62%) and Neem oil (49.29% and 66.83%). Spinosad recorded the highest yield (285.40 q/ha), followed by NSKE which recorded (234.40 q/ha), Bacillus thuringiensis (222.70 q/ha) and Indoxacarb (222.20 q/ha) respectively.