种子和土壤传播的病原菌以单一或联合的方式,造成棉花苗期复合病害,病菌多是真菌。各种致病的线虫常与这些真菌有关,这些生物的结合比单一真菌引起的病害严重,同时危害种子和幼苗。复合病症是种子和幼苗腐烂。幼苗淡黄、坏死、生长缓慢和萎蔫。苗病的发生主要受温度和湿度的影响。 Pathogens transmitted by seeds and soil in a single or combined manner, resulting in cotton seedling complex disease, bacteria are mostly fungi. Various pathogenic nematodes are often associated with these fungi, which bind more severely than single fungi, and endanger seed and seedlings. Complex disease is the decay of seed and seedlings. Seedlings yellowish, necrotic, slow growing and wilting. Miao disease occurs mainly due to temperature and humidity.