苏铁在养护过程中,通常发生两类不同性质的病害:一类是由多种真菌侵染引起的叶枯病或叶斑病,病害从小叶片尖端开始褪绿变黄,逐渐向下扩展;也可从小叶片的中部或基部开始褪绿变黄。病斑圆形或不规则形,边缘深褐色,与健康组织有明显的界限。后期病斑上散生许多黑色针尖状大小的粒状 During the conservation process, two different types of diseases usually occur in cycads: one is leaf blight or leaf spot caused by many fungal diseases. The disease begins to degenerate and yellow from the tip of young leaf and gradually expands downwards. May chlorophyll turn yellow from the middle of the leaflets or base. Spot circular or irregular shape, the edge of dark brown, and healthy organizations have obvious boundaries. Late black spots on the sick spot many black tip-like granular size