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Liu Lunhui Xie Shouchang Zhang Jianhua (Laboratory of Ecology,Kunming Branch,Academia Sinica)  
Eupatorium adenophorum Spreng invaded the south of Yunnan Province from Burma and Vietnam during the end of 1940s. Up to now,its range has spreaded northwards to 23?0'N and eastwards to Guangxi and Guizhou Provinces. In the south part of Yunnan E,adenophorum invaded early,its population has expanded and become a monospecies dominated community which invaded farmlands,harmed grasslands and did some impacts on the growth of tress, and as such get a very bad reputation.In this paper,it is suggested that,to eliminate the barmfulness of E. adenophorum,some preventive measures,such as fixing arable land,strictly forbidding to destroy forests and making reforestation on the cut-over without delay, etc., should be adopted immediately. And it is necessary to introduce natural enemies of E,adenophoram,or to adopt chemical controls,e.g., use of such herbicides as 2,4-D,2,4,5-T and gramaxone.But such measures as the elimination of weeds have little or no effect in controlling E. adenophorum according to the result of the experiments in the world.Besides,the extensively potential invasion of E.adenophorum in China should be allieded an extensive attention.
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