Hossein Arouiee1*, Vahid Jahanbakhsh1, Amir Mahdi Moradi2, and Mahmoud Shoor1 1 Horticultural Department, College of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran. 2 Astan Ghods, Mashhad, Iran. Essential oils of Menthae piperita, Carum caraway, and Foeniculum vulgar were tested for antifungal activity. In this study phythopathogenic, Phytophtora sp. that accumulated from umbelliform locust tree, used as test organism. The essential oils of peppermint and caraway at 2 ppm concentration provided inhibitory activity against tested phythopathogenic organism (Phytophthora sp.) under in-vitro conditions. Phytophthora sp. were completely inhibited at 2 ppm of peppermint and cumin, while in control and other treatment, there were not any anti-fungal activity. The essential oil of peppermint had highest activity between all treatments.

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