The vegetable farmers in Qingxiu Village, Qingkou Town, Minhou County reported to the agricultural technicians that the lettuce in the village was infected with strange diseases and the leaves were yellow. The vegetable farmers saw this situation, so the three-day pesticide fight hopes can be cured, but it does not help. After that, the agricultural technicians in Minhou County saw the lettuce from the strange disease, and the initial judgment was downy mildew. Experts opened the prevention and treatment prescriptions and further tested the samples.
The 60-year-old vegetable farmer has had nearly 30 years of experience in growing lettuce, but he has never encountered such a thing. Lin Congxi said that at the beginning, he thought that the lettuce had been downy mildew. According to the previous practice, he had pesticides, but there was no effect at all, and the leaves were still yellow. Lin Congyu planted 8 mu of lettuce this year. Half a month ago, the leaves began to turn yellow. "What medicines have been beaten, it is not cured." Lin Congxi told reporters that his lettuce 1 mu can earn 5,000 yuan last year. Mu lettuce can sell more than 30,000 yuan, this year has spent four or five thousand pesticides.
The field plants were cultivated 2 to 3 times before the ridge was closed. There are many watering periods in the early stage and less in the later stage. After the plants are closed, the number of watering is reduced, the field humidity is reduced, water is accumulated in the field, plant growth is promoted, and the development of pathogens is inhibited. Timely observation, early detection of the disease, removal of diseased leaves burned, especially the removal of the lower leaves, increased permeability. Pesticide manufacturers recommend that the pre-injection prophylactic spray can be sprayed with 600-800 times liquid M-45 or 56% backing 600-700 times liquid. At the beginning of the onset of the disease, the drug is treated once every 7 to 10 days, and it can be sprayed with 72% gram of 800 liters of liquid, 600 to 800 times of gold leidumir, and 1000 times of 10% of high water granules. When serious occurs, use 72% DuPont gram dew 600-800 times liquid, 85% metalaxyl Mn-Zn WP 500 times liquid, 40% Phytophthora WP 700 times liquid spray, alternate rotation, every 7~ Once every 10 days, continuous spraying 2 to 3 times can effectively prevent downy mildew of lettuce.
After observing the strange disease in the field, the expert's preliminary opinion was that the lettuce had downy mildew. Mainly due to the chilling and hot climate, Qingxiu Village has long-term cultivation of lettuce, and concentrated episodes have prevented the disease from being cured. The China Pesticide Network recommends that vegetable farmers strictly follow the above formula for complete control.
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