Insecticidal actions of several Philippine plants with emphasis on Vitex negundo
1992
Rejesus, B.M. | Maini, H.A. | Dayrit, F.M. | Quintana, E.O. | Ocampo, V.R. (Philippines Univ., Los Banos, College, Laguna (Philippines). Dept. of Entomology)
Water and organic solvent extracts of nine plants: (makabuhay, lagundi, lagunding-dagat, luyang dilaw, wild sunflower, derris, kakawate, hagonoi and alagaw) were evaluated for their insecticidal action against brown planthopper, green leafhopper, diamondback moth (DBM), and corn borer. Water extracts of makabuhay showed systemic and ovicidal toxicities and growth inhibitory effect (IGR). Lagundi and wild sunflower showed contact and ovicidal toxicities and IGR effect. Derris spp. and luyang dilaw showed contact and ovicidal toxicities. Hexane (HE) and six volatile oil (VO) fractions of lagundi were further evaluated for larval and ovicidal toxicities on DBM. Three HE and VO fractions at 100 mg/ml reduced hatching of 70-80% of the eggs while two VO fractions were topically toxic to the larvae. The ethyl acetate extract caused larval abnormalities on DBM and corn borer. The active principle responsible for the ovicidal activity from the volatile oil is Beta-eudesmol.
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