Lettuce planting: what is Sclerotinia sclerotiorum?

What is lettuce Sclerotinia sclerotiorum? What harm does Sclerotinia sclerotiorum do to lettuce? Is there any way to control Sclerotinia sclerotiorum of lettuce? Please introduce the harm of Sclerotinia sclerotiorum to lettuce: Sclerotinia sclerotiorum mainly harms the base of lettuce stem, forms brown watery spot at the beginning, and gradually extends to the stem and root, and the diseased tissue decays. Under wet conditions, there are luxuriant white floc hyphae on the surface, and gradually form a lot of small white particles, which are overflowing with water droplets, and then small particles gradually become black mouse fecal sclerotia, and sometimes many sclerotia are connected into lumps. The upper part of the diseased plant soon wilted and withered. When the young lettuce was infected, the hyphae of the lower part of the plant expanded upward, the speed was fast, and the diseased plant quickly lodged with soft rot. When the temperature is about 20 ℃ and the relative humidity is higher than 80%, it is beneficial to the occurrence and spread of the disease. Lettuce Sclerotinia sclerotiorum control methods: 1. Strengthen cultivation management, implement rotation; rational application of nitrogen fertilizer, increase phosphorus and potassium fertilizer, enhance plant disease resistance. 2. 2. In the early stage of the disease, the following agents were sprayed: 40% sclerotia net wettable powder 1000 times 1500 times liquid, 70% methyl topiramate wettable powder 800 times liquid, 50% carbendazim wettable powder 500 times liquid, 40% chloronitramine wettable powder 800 times liquid, 50% chloronitramine wettable powder 300 times liquid, etc., sprayed every 7 to 10 days, continuously sprayed 2 times for 3 times, and stopped using the medicine about 10 days before harvest. Click for more lettuce planting techniques click to get more vegetable planting techniques