Inquiries: Experts Hello, we have many kinds of leeks in Wushan County. After a period of continuous rainfall, many fields of leeks are browned and soft on the ground, and many white hairs grow on them. What is the disease? How to prevent it?

Answer: This is Sclerotinia sclerotiorum disease. In addition to pests, the disease can also occur on onions, onions, garlic and other crops, often resulting in the drying up of large areas of plant leaves, leaving only the heart.

First, the symptoms: the main damage to the leaves and stalks. At the beginning, the base of the leaves turned brown and rotted, and when it was wet, many white fluffy hairs appeared on it, and then many small sclerotia were found ranging from tan to black. Often cause the leaves of local plants to die, leaving only the heart leaves.

Second, the prevention and control methods: 1. Dispose of sick organizations in time, bring out of the fields, concentrate deep or stack fertilizer. 2. Seriously disease should be carried out with non-onion and garlic crops for 2 to 3 years. 3. The newly planted leeks must be deep-frozen, the best cover mulch to prevent the soil surface of the asthenospores. 4. Strengthen field management. After the rain, the water will be drained in time to reduce the humidity in the field. 5. Early onset of drug control. 40% sclerotium net wettable powder 1200 times, 50% polymylon wettable powder 700 times, 50% nongrill (ethylene nucleus Lee) WP 1000 times, 50% procymidone WP 1500 ~ 2000 times, 56% of the acetochlor chlorothalonil wettable powder 800 times, or 70% thiophanate-methyl wettable powder 1000 times. Note: The spray method should be continuous spray irrigation, the better. Recently, several new pesticides have been introduced: fenhexamid, thiabendazole, fluquinoline, and iprodione, which can also be used. Http://Content/41a4da16-dce7-423d-aea1-f1713cee37e4?cType=2

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