Ovicidal Activity ofCouroupita guianensis(Aubl.) againstSpodoptera litura(Fab.)

摘要

Hexane, chloroform, and ethyl acetate extracts ofCouroupita guianensisleaves were studied for ovicidal activity againstS. litura. All the extracts showed ovicidal activity againstS. litura. Maximum activity was noticed in hexane extract and it showed the least LC50and LC90values; the regression equation was also higher than the other extracts. All the analyzed values showed homogeneity variance. The active hexane extract was fractionated and eight fractions were isolated. The fractions were studied at different concentrations. Among the fractions, fraction 8 showed maximum ovicidal activity with least LC50and LC90values. Fraction 8 differed statistically from the other fractions; the regression equation value was higher than the other fractions. All thePvalues obtained from regression analysis were significant. The results of the present investigation clearly suggest that the active fraction could be purified to isolate active compound(s) and could be used to develop an insecticidal formulation to control economically important agricultural pests.