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In artificial inoculations it was found that Fusarium oxysporum f.sp. tuberosi is able to penetrate through potato leaves. The fungus was isolated from the stem of infected plants from all inoculated cultivars. Tubers were completely destroyed if they were inoculated before sprouting. Not any destruction was observed if inoculation was made before young sprouts are longer than 1-3 cm; plants from these sprouts were infected. Lesioned tubers were more sensitive than unlesioned ones, and tuber rot and sprout damage were increased significantly. [ABSTRACT FROM AUTHOR]