NEHA SHARMA* AND N.S. BHADAURIA

Bioefficacy of water and ethanol extracts of Margosa seed, Margosa leaf, Night jasmine, Forest jasmine and Datura at higher and lower concentration were tested against 3rd instars of H. armigera. The plant materials at higher concentration and ethanol extracts at lower concentration reduced the consumption of food by the larvae and their body weight significantly in comparision to control. Larval pupal deformities among different extracts ranged from 5.0 to 40 per cent as against 5 percent in control. It was also significantly higher in higher concentration of margosa seed (2000 ppm) followed by margosa leaf. The experiment clearly indicates that ethanol extract of seed at higher concentration was more effective causing higher antifeedant activity, reduced larval-pupal weight and deformities which ultimately led to reduction in adult emergence.