Abstract: In order to evaluate fungicidal effects of Percidin 535® (Per acetic acid 15%) against some phytopathogenic fungi; six concentration of Percidin 535® including 10, 40, 160, 630, 2500 and 10000 ppm mixed with PDA media were evaluated against Fusarium oxysporum, Rhizoctonia solani and Phytophtora citrophthora radial growth. Antifungal activity was determined in terms of growth inhibitory concentration for 50% growth inhibitory (EC50) and inhibition percentage of some dosages was obtained. Also fungicide effect of Percidin 535® was compared with Captan (Ortocide®) in same concentrations of 1000 and 2000 ppm in PDA media. Compound transport by root to aerial parts was evaluated by adding to soil of soybean plants in pots and culturing some parts of leaves and shoots in equal size on PDA media against mycelia plug disc of Fusarium oxysporum. Percidin 535® showed a significantly high effect against linear growth of tested fungi. At 10000 ppm Percidin 535® gave a complete inhibition on mycelia growth of tested species. EC50 for Fusarium oxysporum, Rhizoctonia solani and Phytophtora citrophthora were counted 1381, 887.91 and 947.65 ppm, respectively. Percidin 535® was effective than Captan (Ortocide®) in mycelia growth inhibition of Fusarium oxysporum. The results of compound transport indicate that PAA is able to move in soybean plant from root to aerial parts.