Recently, a farmer in Feixiang County called and said that he had a round or near-circular brown patch on the leaves of an acre of asparagus, about 3 to 15 mm in size, and the back of the lesion was also black and moldy when it was wet. Things. Ask what is this disease, how to prevent it?
Expert Wang Guiren A: According to this preliminary inference, the shape should be lettuce black spot.
1. Symptoms:
Lettuce black spot, also known as ring disease, leaf blight. The main damage to the leaves, the formation of a round to nearly circular brown spots on the leaves, under different conditions, the lesion size difference is larger, brown to gray-brown, with concentric ring pattern, in the field generally do not see the mold layer mold layer. According to the data, germs will overwinter on the sick or the soil in the soil and spread through wind and rain. It is warm and humid, and the disease in the rainy days is popular.
2. Control measures:
During the cultivation process, field management should be strengthened, organic fertilizer and phosphorus and potassium fertilizers should be added, and plant resistance to disease should be improved. Rotation is not carried out with crops of the Asteraceae family. In time, old leaves and diseased leaves are used and the diseased bodies are burned.
At the early stage of disease, the following fungicides or formulas can be used for prevention and treatment: 10% difenoconazole water dispersible granules 1500 times liquid + 75% chlorothalonil WP wet 600; 25% chlorfluzuron EC 1000-2000 times Liquid + 70% mancozeb WP 700 times; 25% Prochloraz EC 800 ~ 1000 times + 75% chlorothalonil wettable powder 600 times; 25% Bromocronitrile WP 500 ~ 1000 Times of liquid + 75% chlorothalonil WP 600 times; 25% of azoxystrobin suspension 1000 ~ 2000 times; 77% of copper hydroxide wettable powder 800 times; 7% chloramphenicol oxychloride copper can be Wet powder 600 to 800 times; 50% iprodione suspension 1000 to 2000 times liquid, even spray, depending on the disease 7 to 10 days spraying once.
The onset period can also be selected from 50% acetaminophen WP 1500 times, 40% cebutan WP 400 times, 70% EB Mn Zn wettable powder 500 times, etc., alternating for 7 days. A total of 2 or 3 times.
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