Toxicity of biopesticides against tomato fruit borer helicoverpa armigera (Hubn.)

The toxicity of some biopesticides evaluated against neonate larvae of Helicoverpa armigera (Hubn.) revealed that Melia SFE was the most effective (LC₅₀ and LC₉₀ values being 0.010 and 0.07%, respectively) followed by Eupatorium SFE (0.012, 0.009%, respectively), and Neemarin 300 (0.056, 0.296%, respectively). Neemarin 300 showed maximum antifeedant activity (85.46%) followed by Melia SFE (77.59%). Panchagavya showed maximum repellent activity (83.33%) followed by agneyastra (66.67%). HaNPV and Melia drupe extract in cow urine showed maximum mortality (80.00%) through stomach action followed by Eupatorium leaf extract in cow urine (76.67%). The persistent toxicity values revealed that the order of effectiveness was: Neemarin 300 > Melia SFE > Eupatorium SFE > HaNPV > Melia drupe extract in cow urine > Eupatorium leaf extract in cow urine > panchagavya > agneyastra > cow urine. There was no mortality of Chelonus blackburni adults in HaNPV and cow urine treatments.