棉花枯萎病是一种维管束病害,此病菌在导管中产生大量小分生孢子,小分生孢子在茎中部及子叶节产生较多,其次主根及下胚轴,病子叶柄与生长点较少。棉株随着病情的加重,病导管中孢子数量随之减少。病棉株体表可产生很大数量大分生孢子,并由大分生孢子某些细胞形成厚垣孢子。用 PDA 或选择性培养基培养能产生小分生孢子、厚垣孢子,或数量有限的大分生孢子。体内外部较易产生小分生孢子,而且数量也大。而大分生孢子则需求特定的营养及生态条件才能产生。 Fusarium wilt of cotton is a vascular bundle disease, which produces a large number of small conidia in the catheter. The small conidia produce more in the stem and cotyledonary node, followed by the main root and hypocotyls, less. As the disease progresses, the number of spores in the diseased catheter decreases. Bibulous body surface can produce a large number of large conidia, and by some conidia cells forming chlamydospores. Incubation with PDA or selective medium produces small conidia, chlamydospores, or a limited number of macrofungal spores. In vivo and outside the more likely to produce small conidia, but also a large number. Macrocyne conidia require specific nutrients and ecological conditions to produce.