Insecticidal activity of root bark of Calotropis gigantea L. against Tribolium castaneum (Herbst).

2 Abstract: The residual film toxicity, fumigant toxicity and repellent effect of methanol extract of root bark of Calotropis gigantea (Linn) and its chloroform and petroleum ether (40-60°C) soluble fractions were evaluated against several inster of larvae and adult of Tribolium castaneum. In residual film toxicity, methanol extract and its chloroform and petroleum ether fractions showed insecticidal activity against T. castaneum and data were analyzed by probit analysis. Methanol extract showed lowest LD values against several inster of larvae and 50 adult (121.59, 142.73, 146.84, 202.98, 290.65, 358.42 and 300.03 µg/cm , respectively) which indicates highest 2