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Pineapple disease occurs in all sugarcane provinces in China and is an important disease of sugarcane seedlings. In addition to making it impossible for the next kind of sugarcane to sprout, it can also cause rot in the cellar cane species. At present, in China's sugar cane disease, pineapple disease is one of the diseases that have a major impact on production. First, the symptoms. After the infected cane species were cut, the ends of the incision were red, and the pineapple-like odor was emitted, so it was called pineapple disease. Soon the incision gradually darkened and produced many black coal powders. When the disease progresses to the late stage, all the stems turn black. When all parenchyma cells have been destroyed, the seedlings are emptied, leaving only the vascular bundles to remain as a bundle of hair. Second, the incidence of law. The primary source of infestation of pineapple disease is mainly bacterial soil. The Oxyconi spores can survive for up to 4 years in the soil and invade the cuts at both ends of the sugarcane plant under suitable conditions, causing initial infection. Small constellation spores are prone to germination and spread by wind, irrigation water, and insects, causing repeated infestation. Long-term low temperature and high humidity are the two leading causes of severe occurrence of pineapple disease. Soils with heavy clay cane fields are planted immediately after irrigation, causing soil compaction or low-lying stagnant water, which can cause a large number of wind pear diseases. Third, prevention and treatment methods. The combination of agricultural control and chemical control is the most important method for controlling pineapple disease. 1. Cultivation measures. 1 selection of shoots. Because the shoots sprout quickly and feel lighter. 2 Soaking. Seedlings germinate early after soaking, with hair roots growing early and growing early. Soaking is best with 2% lime water, can also be used water, soaking time is 1 day. 3 Membrane Yi can cover winter and spring sugar cane. Planting sugarcane in winter and spring is generally planted at lower temperatures, and sugarcane species are vulnerable to pineapple disease. The use of plastic film covering can play a role in heat preservation and moisturizing, promote the early germination of sugarcane in winter and spring, and reduce the damage of pineapple disease. 2. Chemical control. Using any of 50% carbendazim, thiophanate-methyl, or phenylenediamine wettable powder, dilute the seed by 1000-fold for 3 minutes.