PURPOSE:To provide a controlling fungus composed of a non-pathogenic fusarium fungus and useful for the control of plant blight caused by Verticillium dahliae. CONSTITUTION:F-4 strain (FERM P-9976) which is a mold belonging to genus Fusarium is cultured in a medium for conventional mold (e.g., potato soup medium added with sucrose) at 25-30 deg.C. The obtained cells of F-4 strain are suspended in water. The root of a plant seedling grown for a prescribed period is immersed in the suspension for a specific period and the plant is planted on soil to control the plant blight caused by Verticillium dahliae. The control fungus is especially effective for the control of verticillium wilt of soybean, verticillium wilt of green pepper, verticillium wilt of eggplant, etc.
