Bioefficacy of Clerodendrum phlomidis Linn. f. and Flueggea leucopyrus (Koen.) Willd. against Earias vittella Fab.

摘要

Antifeedant and larvicidal activities of hexane, chloroform and ethyl acetate extracts of Clerodendrum phlomidis and Flueggea leucopyrus at 5, 2.5, 1.0 and 0.5% were studied against III instar larvae of Earias vittella. Hexane extract of F. leucopyrusand chloroform extract of C. phlomidis showed maximum antifeedant activity of 81.00 and 80.48%, respectively at 5% concentration. The least LC_(50) and LC_(90) values of 1.21 and 1.36% for hexane extract of F. leucopyrus and 4.96 and 5.11% for chloroform extract of C. phlomidis, respectively. Cent percent larvicidal activity was observed in chloroform extract of C. phlomidis at 5% concentration, while hexane extract of F. leucopyrus recorded at 87.52 and 5% concentration. The LC_(50) and LC_(90) valuesfor larvicidal activity ware 0.51 and 1.74% for chloroform extract of C. phlomidis and 1.74 and 4.69% for hexane extract of F. leucopyrus, respectively. No adult emergence was observed at all concentrations of C. phlomidis chloroform extract and at 5 and 2.5% concentrations of F. leucopyrus hexane extract. The chi-square values for both antifeedant and larvicidal activities were significant. The results clearly indicated that chloroform extract of C. phlomidis and hexane extract of F. leucopyrus couldbe exploited to develop a new pesticidal formulation for eco-friendly pest management.