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水稻苗期的主要病害有环境不良造成的生理烂秧和病菌侵染性烂秧。生理性烂秧随种子播后生育进程依次表现为烂种、烂芽、黑根、青枯和黄枯。病菌侵染性烂秧主要有绵腐病、立枯病及恶苗病等,病都表现霉层及植株枯死。 上述病害的病原菌,主要在水中、土壤中营腐生生活。恶苗病菌可存于病稻种中。病菌越冬后翌春萌动或产生孢子侵入稻种,或借助流水传播侵入幼芽幼根,引起发病。
The main diseases at the seedling stage of rice are the rotten seedlings and the rotten seedlings which are caused by bad environment. Physiological rotten seedlings with the sowing process of seed after the turn showed rotten, rotten buds, black roots, green and yellow withered. Pathogens of infectious rotten seedlings mainly cotton rot, blight and diarrhea and other diseases, mold and plant disease withered dead. Pathogens of the above diseases, mainly in the water, soil camping life. Fungi can exist in the disease of rice species. After the spring overwintering bacteria sprout germination or spores invade rice species, or through the spread of water invasion of sprouting root, causing the disease.