葡萄霜霉病

• 作 者: 张金红
• 机 构: 围场县农广校,
• 出 处: 河北林业
• 发表日期: 2002年01期
• 关键词: 葡萄霜霉病 油渍状 大微 斑点 新梢 后扩 背部 叶柄 褐色 病残组织

1、症状。危害叶片,也能侵染新梢,叶片受病菌侵染后,初期呈半透明,边缘有不甚清晰的小斑点。以后扩展呈黄色或褐色的多角形病斑,能愈合或形成大病斑,天气潮湿时,在病斑的背部产生白色的霜霉,病梢生长停滞、扭曲甚至枯萎。幼果染病后,病部褪色、变硬,最终果实脱落。新梢、须、穗及叶柄发病时,开始也呈现出半透明的油渍状小斑点,后扩大微陷,病斑上相继产生白色霜霉。

1, symptoms. Harm the leaves, but also infect the shoots, the leaves infected by bacteria, the initial was translucent, the edge is not clear little spots. After the expansion of yellow or brown polygonal lesion, can heal or form a large lesion, the weather is humid, in the back of the lesion produced white downy mildew, disease growth stagnation, distortion or even wilt. Young fruit disease, the disease faded, hardened, the final fruit off. New shoots, whiskers, spikes and petiole incidence, the beginning also showed a translucent small spots of oil-like, after the expansion of small subsidence, lesions have white downy mildew.