Bio-efficacy of chlorantraniliprole 10% + lambda-cyhalothrin 5% ZC and some sole insecticides against lepidopteran borers in cabbage

Abstract

The results of bio-efficacy revealed that the treatment, Chlorantraniliprole 10% + Lambda-cyhalothrin 5% ZC 250mL ha-1 was found to be most effective treatment against P. xylostella and S. litura larvae in cabbage on the basis of collected 3,7 and 10 days after both spray during Rabi season of 2021-22. The overall mean larval population recorded after 1st and 2nd spray, treatment Chlorantraniliprole 10%+ Lambda-cyhalothrin 5% ZC 250mL ha-1 was most effective (0.61 larvae plant-1 and 0.57 larvae plant-1, 0.81 larvae plant-1 and 0.71 larvae plant-1, respectively) followed by Chlorantraniliprole 25g a.i. ha-1 (0.78 larvae plant-1 and 0.66 larvae plant-1, 0.93 larvae plant-1 and 0.83 larvae plant-1, respectively) against P. xylostella and S. litura. The treatment, Chlorantraniliprole 10%+ Lambda-cyhalothrin 5% ZC 250mL ha-1 (379.33 q ha-1) also produced maximum yield followed by Chlorantraniliprole 25 g a.i. ha-1 (360 q ha-1) and Flubendiamide 60g a.i. ha-1 (340 q ha-1). The benefit: cost ratio of insecticides indicated that Chlorantraniliprole 10%+ Lambda-cyhalothrin 5% ZC 250mL ha-1 (35.09:1) is the most economic insecticide followed by Lambda-cyhalothrin 30g a.i. ha-1 (32.22:1). The least cost-effective insecticide was Spinosad 60g a.i. ha-1 (1.25:1) followed by Indoxacarb 60g a.i. ha-1 (3.07:1).