Lettuce white rust, with methomyl manganese zinc or enoyl manganese zinc or dicenyl manganese zinc or frost urea manganese zinc or ethidium aluminum manganese zinc and other prevention and control, every 7 ~ 10 days foliar spraying, continuous spraying 2 ~ 3 times, can control the disease, and make the diseased plant to return to normal growth. Add potassium dihydrogen phosphate and natural brassinas with spraying, the control effect is better.