The effects of different doses of 45% propamocarb·fenamidone SC on potato late blight were studied in the paper. The results showed that the overall control effect of 45% propamocarb·fenamidone SC against potato late blight on the 14 th day after the third spraying were 67. 64%- 83. 78%. The yield of potato reached 19 972. 5- 23 302. 5 kg / hm2,with higher marketable tuber rate and lower rotten tuber rate. With the increase in fungicide dose,the difference in control effect against late blight was significant,but the yield-increasing effect on potatoes was not significant. The appropriate application dosage of 45% propamocarb·fenamidone SC were 450- 675 g / hm2.
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