76NEMATICIDAL ACTIVITY OF SOME NATURAL PRODUCTS AGAINST ROOT – KNOT NEMATODE ON SUNFLOWERThe aim of this experiment was to evaluate the nematicidal activity of acetone and aqueous extracts of leaves and root of Artemisia scoparia, Thymus vulgaris, and Parthenium hysterophorus on Meloidogyne incognita on sunflower. Significant enhance of plant growth parameters of sunflower were documented with the application of aqueous and acetone extracts of effective concentrations of leaves and roots of A. scoparia, T. vulgaris and P. hysterophorus. Maximum growth of tested plant including shoot, root length, dry weight of shoot and root were recorded using aqueous extracts of Thymus leaf and root extract. All the treatments of acetone extracts, Thymus and Artemisia root were effective in enhancing growth parameters of sunflower. The population of Meloidogyne incognita in soil and root, 100 days after inoculation showed significant reduction of nematode population in both extracts of Thymus leaf and roothramezani@spnu.ac.irResearch512015Meloidogyne incognita,Natural products,Nematicidal activity,Plant growth,SunflowerHesamedin Ramezani,Gholamreza Bakhshi KhanikiDepartment of Agriculture, Payame Noor University, PO Box. 193595-3697, Tehran, Iran,Department of Agriculture, Payame Noor University, PO Box. 193595-3697, Tehran, Iran