How to control lettuce downy mildew

Field plants were cultivated 2 to 3 times before mulching. The watering stage is much earlier and the late period is less. The number of watering times after planting ridges is reduced, the field humidity is reduced, the field water is prevented, the plant growth is promoted, and the development of the germs is suppressed. Observe in time, find out the condition early, remove the diseased leaf and burn it, especially remove the old leaves from the lower part to increase the permeability. Prophylactic spray before the onset can be used 600 ~ 800 times fluid M-45 or 56% 600 ~ 700 times from the mountain and other spray. At the beginning of onset, once every 7 to 10 days, the drug is used to prevent and cure once, and 72% Kelu 800 times liquid, Jinlei Duomi 600~800 times liquid, and 10% Shihco water dispersible granules can be sprayed 1000 times. When severe, 72% DuPont Kelu 600-800 times solution, 85% metalaxyl MnZn wettable powder 500 times solution, 40% Phytomycin WP 700 times solution spray, alternate rotation, every 7～ 10 times a day, continuous spraying 2 or 3 times, can effectively control lettuce downy mildew.

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