种子或土壤带菌、动植物群单独或联合作用,往往产生棉花苗期复合病害。许多病原菌是普遍存在的真菌,它们群聚在许多其他寄主与棉花上,并在那里发育。致病线虫也常常与这些真菌共存。这些生物的联合作用能引起比单一真菌引起的更为严重的病害问题。每种病原菌都在起作用,几种生物同时危害种子和幼苗,就造成了相互关联的综合症状。这些病害的综合症包括芽前发生的种子和幼苗的腐烂、芽前与芽后幼苗的失绿和坏死、矮化和枯萎等种种后果。虽然苗期病害的发病率主要决定于不利的温度和土壤湿度,但是,任何有利于病原菌迅速发育,而不利于寄主的条件都是有害的。 Seed or soil with bacteria, flora and fauna alone or in combination, often produce cotton seedling complex disease. Many pathogens are ubiquitous fungi that cluster on many other hosts and cotton and grow there. Pathogenic nematodes also often coexist with these fungi. The combined effect of these organisms can cause more serious disease problems than single fungi. Each pathogen is at work, with several organisms compromising seeds and seedlings at the same time, creating interrelated syndromes. The syndromes of these diseases include the decay of seeds and seedlings occurring before budding, the de-greening and necrosis of young and young seedlings before and after bud emergence, dwarfing and wilting. Although the incidence of seedling diseases is mainly determined by unfavorable temperature and soil moisture, any conditions conducive to the rapid development of pathogenic bacteria that are detrimental to hosts are detrimental.