Evaluation of Melia azedarach Extracts against American Bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae)
Jaglan, Maha Singh; Khokhar, K S; Khokhar, Sucheta; Singh, Ram
Melia azedarach (Linnaeus 1753) drupes and green leaves extracts (methanol and chloroform: methanol) were evaluated against American bollworm, Helicoverpa armigera (Hubner 1806). Various concentrations of extracts were used to treat natural foods, viz leaves and pods/bolls of chickpea, pigeonpea, and cotton. Treated foods were offered to early stage (neonate) and advanced stage (grown up) larvae of H armigera for 48 h, and then, untreated food was offered for the rest of life. Chloroform: methanol (9: 1) extracts of M azedarach drupes and leaves showed better insecticidal properties than methanol extracts. However, M azedarach drupes extract in chloroform: methanol (9: 1) was the most promising in causing adverse morphogenic effect on various biological parameters of H armigera. Early stage larvae were more sensitive to the exposure of M azedarach extracts than advanced stage larvae.