Antifeedant, larvicidal and growth inhibitory activities of fractions from Clerodendrum phlomidis Linn. F. against bhendi fruit borer Earias vittella Fab

摘要

Antifeedant, larvicidal and growth inhibitory activities of 12 fractions from chloroform extract of Clerodendrum phlomidis Linn. F. were evaluated against Earias vittella. Among the fractions, fraction 5 showed promising antifeedant activity of 86.94%at 1000 ppm followed by 500 ppm concentration with the least LC50 and LC90 values of 120.15 and 1027.92 ppm, respectively, with significant Chi-square values. Fraction 5 had maximum larvicidal activity of 86.38% at 1000 ppm concentration with the leastLC50 and LC90 values of 245.42 and 1010.99 ppm, respectively, with significant Chi-square value of 51.33 (p < 0.05). Fractions 5 and 6 reduced the adult emergence to 0% at 1000 ppm concentration. According to our knowledge, this is the first report of fractions from C. phlomidis for activity against E. vittella. The study clearly suggests that the fraction from C. phlomidis could be used to develop a new botanical formulation to manage economically important pests.