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在适合病害发生发展的环境条件下,在一个时期或一个地区内,病原物由气流传播,再侵染频繁,而引起了病害的大量发生,不仅是发病率普遍,而且发病程度也严重,这种现象叫做病害的流行。而经常引起流行的病害,叫做流行性病害。这类病害常给农业生产带来毁灭性灾害。因此,也是植物病害研究工作中的主要对象,如小麦锈病、赤霉病、稻瘟病、稻白叶枯病、番茄和马铃薯晚疫病、黄瓜霜霉病等。2009年2月3日至中旬,温州等浙南地区番茄晚疫病大发生,成为流行性病害,温州市各县
Under the environmental conditions suitable for the development of the disease, the pathogen is spread by the air current within a period or a region, frequently re-infested, causing a large number of disease occurrences, not only the prevalence but also the serious degree of the disease, which The phenomenon is called disease epidemic. Often caused by the epidemic disease, called epidemic disease. Such diseases often cause devastating agricultural production. Therefore, it is also the main target of plant disease research, such as wheat rust, scab, blast, rice leaf blight, late blight of tomato and potato, cucumber downy mildew and so on. February 3, 2009 to mid-Wenzhou, Zhejiang Province, southern Zhejiang epidemic occurred late blight, becoming an epidemic disease, Wenzhou counties