Comparison of the Control Efficacy of Several Fungicide Combinations against Potato Late Blight

Spraying for controlling potato late blight according to the potato late blight infection occurrence time predicted by warning system of CARAH,Mancozeb was applied in the first spraying while fluopicolide propamocab hydrochloride,famoxadone cymoxanil,dimethomorph,cymoxanil Mancozeb,metalaxyl Mancozeb and mandipropamid were applied for 3 times in the following 3 infections.The results showed that the control effects of the 6 fungicide combinations against potato late blight were good.The control efficiency 7 d after the last spraying was 94.89%,87.44%,94.11%,88.22%,81.00%,and 93.67% respectively;and the yield was increased by 5.63%~24.69%.