1994～1996年,长阳县移民部门为了恢复县内隔河岩库区移民生产和发展经济,从外省引进萘李苗68000株,分布于库区4个乡(镇),折合面积75hm2。当时由于检疫措施未跟上,引进苗木带病,导致萘李根癌病严重发生。据县植检站调查(1998年),县内鸭子口乡移民新村刘坪村当年发展连片萘李基 From 1994 to 1996, the immigration department of Changyang County imported 68,000 Naphthalene plums from other provinces in order to restore the production and economic development of immigrants in Geheyan reservoir area in the county and distributed in 4 townships (towns) in the reservoir area, equivalent to 75hm2. Quarantine measures did not keep up at that time, the introduction of seedlings disease, leading to serious occurrence of naphthalene Lee root cancer. According to the county phytosanitary station survey (1998), the county duck village migrant village Liu Pingcun year development of concomitant naphthalene Lee base