By measuring the plant height,fresh weight,number of branches,number of reproductive branches and inflorescences of plants infected with alfalfa downy mildew,the effects of alfalfa downy mildew on alfalfa growth were studied.The results showed that the plant height,fresh weight,number of branches,reproductive branches and inflorescences of alfalfa plants infected with alfalfa downy mildew decreased by 10.40％～36.50％,18.61％～64.55％,4.92％～36.87％,17.90％～86.15％and 17.75％～87.50％,respectively.The water content and chlorophyll content of the leaves decreased by 7.48％～43.02％and 28.42％～68.63％,respectively.
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