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美国白蛾是一种以危害绿色植物为主的国际性检疫害虫,也称秋幕毛虫、网幕毛虫。美国白蛾原发生于北美洲,1940年传到欧洲,1945年从美国传入日本,给日本的蚕桑业造成严重危害;1957年侵入到朝鲜;1979年,在我国辽宁省丹东市首次发现,1984年在陕西咸阳、山东榕城发生并造成局部灾害;1989年进入河北山海关;1995年进入天津市塘沽区。2003年9月,在北京市平谷区金海湖地区首次监测到美国白蛾;2004年在平谷、顺义、大兴、通州和怀柔等5个区25个乡镇90个村庄监测到美国白蛾;2005年,在大兴、通州、顺义、平谷、怀柔、密云、昌平、朝阳和丰台等9个区县65个乡镇(小区)933个村(点)监测到美国白蛾成虫或幼虫。
American white moth is a kind of international quarantine pests which are mainly harmful to green plants, also known as fall curtain caterpillars and screen caterpillars. The white moth originated in North America, spread to Europe in 1940, and was introduced into Japan from the United States in 1945, causing serious harm to the sericulture industry in Japan. It invaded North Korea in 1957. For the first time in Dandong, Liaoning Province, in 1979, 1984 in Xianyang, Shaanxi, Rongcheng, Shandong, and the occurrence of local disasters; 1989 entered the Shanhaiguan Hebei; in 1995 entered the Tanggu District of Tianjin. In September 2003, the American white moth was first detected in the Jinhai Lake area in Pinggu District of Beijing. In 2004, the American white moth was monitored in 90 villages in 25 towns and villages in 5 districts of Pinggu, Shunyi, Daxing, Tongzhou and Huairou. In 2005 , And adults or larvae of C. elegans were detected in 933 villages (spots) in 65 townships (districts) in 9 districts and counties including Daxing, Tongzhou, Shunyi, Pinggu, Huairou, Miyun, Changping, Chaoyang and Fengtai.