Nematicidal activity of some plant species against the root knot nematode, Meloidogyne graminicola.
2007
Gapasin. R.M., Benguet State Univ., La Trinidad, Benguet (Philippines). Dept. of Plant Protection | Miller, S.A, Ohio State Univ., Ohio(USA) Dept. of Plant Pathology | Donayre, D.K., Philippine Rice Research Inst., Maligaya, Science City of Munoz, Nueva Ecija (Philippines) | Ranchez, C.V, Leyte State Univ., Baybay, Leyte (Philippines)
Thirteen plant species showed high nematicidal activity against Meloidogyne graminicola. These were mahogany (Swetenia macrophylla), 'marikit'(Calotropis gigantea), marigold (Tagetes erecta), papaya (Carica papaya), 'Kuyoto' (Dioscorea hispida), euphorbia (Euphorbia heterophylla), 'asunting'(Cassia alata), centrosema (Centrosema pubescens), crotalaria (Crotalaria incana), 'bagalunga' (Melia dubia), Neem tree (Azadiracta indica), 'makabuhai' (Tinospora rumphei), and 'buyo' (Piper betle). No galls were formed in the roots of rice seedlings 35 days after inoculating the second stage larvae previously dipped in these extracts for 24 hrs. Neem tree, papaya, euphorbia, and kuyot were more potent than the rest because their extracts still showed very high activity even at 25 percent concentration. These four plant species when applied, regardless of form (powder, fresh extract, and chopped leaves, tubers), significantly reduced the number of root galls and nematode density in the soil compared with the untreated control. The powdered form of Neem tree and papaya were comparable and or better than the effects of nematicides (Mocap). This may be due to the higher concentration of the nematicidal compound present in this form. However, Neem tree, papaya, and euphorbia in its powdered form showed phytotoxic effect as shown by the smaller plants and lower fresh weight of harvested onion compared to the untreated control.
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