Antagonistic fungi, Trichoderma harzianum ( Ti, from bean field in Ahwaz , T2, from tomato field in Karaj), T. viridi (T3, from bean field in Sahriar, T4, from collection of plant pest and Disease Institute Tehran ) were used to control fusarium wilt of tomato incited by Fusarium oxysporum f. sp. lycopersici and their effect on weight and height of tomato plants. The experiment was carried Out in a completeLy randomized design in pot under greenhouse conditions. The results showed that the antagonistic fungi decreased wilt fusariomic disease , 69, 91, 68, 13, 60, 98 and 57, 69 % respectively in respect to inoculation control . The antagonistics in order of efficacy were T2> T1, T3>T4>. Effect of the antagonists on the height and fresh - weight of tomato plant was positive . The use of the antagonists in the non - inoculated soil with the pathogen had low positive effect on the growth (heigh) of the tomato plant.
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