Evaluation of toxicity of biopesticides against okra moth, Earias vittella (Fabricius) (Noctuidae: Lepidoptera)
Pratibha, Rajendra Singh
The toxicity of garlic bulb aqueous extract, neem leaf aqueous extract and NeemGold (neem oil) (Azadiractin 0.03% EC, 300 ppm) was evaluated against okra moth, Earias vittella (F.) (Noctuidae: Lepidoptera) under laboratory conditions. The LC50 values were determined at different doses (20, 30, 50 and 70 mg) were used for the aqueous extract of garlic bulb and neem leaf, and NeemGold (neemoil) for 24 h to 96 h exposure periods. The significant time and dose dependent toxic effect of all biopesticides were observed against E. vittella. The result demonstrated that E. vittella is very sensitive to NeemGold (LC50 = 39.31 mg and 22.45 mg for 24 h and 96 h treatment, respectively) followed by neem leaf aqueous extract (LC50 = 42.03 mg and 28.02 mg for 24 h and 96 h treatment, respectively) and garlic bulb aqueous extract (LC50 = 61.85 mg and 39.42 mg for 24 h and 96 h treatment, respectively). It evinced that the NeemGold is more effective than neem leaf aqueous extract and garlic bulb aqueous extract for reducing the number of E. vittella larvae. Thus, the botanical tools are also valuable for managing the population of agricultural pests and being ecofriendly it gives better results for the management of Earias vittella.