Preliminary Study on Physiological Race Differentiation in Tomato Leaf Mold in Three Northeastern Provinces of China

Tomato leaf mold samples collected form tomato plants cultivated in plastic house in three northcastern provinces of China were studied by artifical spray inoculation at seedling stage,consulting Hbbeling physiological races 1,2,3,race 1,3 and race 3.Among them race 1,2,3 was the predominant.