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据调查,落叶松枯梢病在国内8个省(区)110个县(市)有分布。种子、无症状的苗木,新梢及2年生以上的枝干树皮、木质部均不带病原菌,仅病苗、病梢是带菌者。离体病原孢子在自然条件下只能存活13d,组织内部的菌体可存活3～4a。故落叶松苗木、接穗、原木、小径木为应受检疫对象。以现场抽样观察与病理解剖为主,必要时辅以诱发试验、分离培养是可靠的检验手段。清除混杂在苗木中的罹病个体和原木、小径木上附带的小枝梢是简便、易行、有效的除害处理方法。
According to the survey, Larch blight disease is distributed in 110 counties (cities) in 8 provinces (districts) in China. Seeds, asymptomatic seedlings, shoots and branches above 2 years of bark, xylem are not with pathogens, only the vaccine, the disease is carriers. In vitro pathogenic spores can only survive for 13 days under natural conditions, the cells within the organization can survive 3 ~ 4a. Larch seedlings, scions, logs, footpath wood quarantine subject. Site sampling observation and pathological anatomy based, if necessary, supplemented by induced test, isolation and culture is a reliable test means. Removal of diseased individuals and logs mixed in nursery stock and small shoots attached to trail wood are simple, easy and effective methods of pest elimination.