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from mycorrhized and non-mycorrhized plants were collected and applied to both
mycorrhized and non-mycorrhized plants in the greenhouse. This was repeated until twelve
days after nematode inoculation, when the plants were harvested for nematode counting.
Further, the flavonoid content of the collected mycorrhized and non-mycorrhized root
exudates was determined by HPLC analysis. The effect of the differential compounds on
nematode behaviour, i.e. chemotaxis, egg hatch and viability, was then studied by using in
vitro bioassays.
Studies on the Nematicidal Activity of Plant Extracts and their Control of
Plant Disease Caused by Nematodes
Wen, Y-H., L-Y. Peng, G-J. Wang & H. Xie
Laboratory of Plant Nematology, College of Environmental and natural Resource, South China Agricultural
University, Guangzhou 510642,China
Ethanol extracts of 46 species of plants (belong to 33 families) from China were screened for
nematicidal activity (NA) against Bursaphelenchus xylophilus and Meloidogyne incognita by
the fungal-feeding and dipping bioassays method. Croton tiglium L., Ruta.graveolens L,
Cerbera manghas L., Axillary Choerospondias Fruit, Sapium sebiferum (Linn.)Roxb,
Tripterygium Wilfordii Hookf., Dysosmavers ipelis(Hance)M.Cheng , Lantana camara L. and
Artocarpus heterophyllus Lam showed very strong NA against Bursaphelenchus xylophilus
(80%-90%); while Lagerstroemia speciosa(L.)Pers, TripterygiumWilfordii Hookf.
Ophiopogon japonicas (Linn.f.)Ker-Gawl., Colocasia gigantean, Eucalyptus citriodora,
Croton tiglium L., Sapium sebiferum (Linn.)Roxb., Aconitum hemsleyanum, Dysosmavers
ipelis(Hance)M.Cheng, and Schima superba showed strong NA against second stage juvenile
of Meloidogyne incognita (85%-100%).Pot experiments showed that Dysosmavers
ipelis(Hance)M.Cheng, Celastrus angulatus, Eucalyptus citriodora, Sapium
sebiferum(Linn.)Roxb, Croton tiglium L, Lantana camara and Cerbera manghas L. could
effectively control the root-knot disease by powder or root irrigation methods. Soil add the
powder of this plants or water with the extracts of this plants could significantly reduce the
nematode infection, the number of galls in root and the number of nematode in galls; and
inhibit the egg hatching.
5 th International Congress of Nematology, 2008 304