Nematicidal activities of some native plants of Iran have been investigated against cucumber root-knot nematode (Meloidogyne incognita) in laboratory and greenhouse. For this purpose, the effects of alcoholic extract of the leaf of castor bean, chinaberry, sweet wormwood and rapeseed with concentrations of 0, 50, 100, 200, 300, 400, 500 and 1000 ppm on the percentage of immobility of second stage juveniles and hatching of eggs were evaluated. After proving the anti-nematode activity of treatments, the investigation was held in greenhouse by two methods. In the first method extract of plants were added into pots having cucumber seedlings infested with nematode and in the second method seedlings were dipped in alcoholic extract and then transplanted into nematode infested pots. The results indicated that all of the plant extracts had nematicidal activity. Overall alcoholic extracts of chinaberry with 68.66% was most effective on second stage juvenile and sweet wormwood with 32.69% had higher efficacy on un-hatched eggs of nematode in the laboratory conditions. The results of greenhouse experiments showed that the alcoholic extract of chinaberry and castor bean reduced the number of galls and population of nematodes in soil in a proper way. The results also revealed that the dipping of seedling in extracts reduced population of nematodes and numbers of galls.

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