Green pollution "illegal immigrants" bring disaster.

Eupatorium adenophorum belongs to the genus Eupatorium in Compositae and is native to Central America. In 1980s, it was introduced to the south of Yunnan from China-Myanmar and China-Vietnam borders. Now it has been widely distributed in many areas of Yunnan, Guangxi, Guizhou, Sichuan and other places, and is moving northward at a rapid speed. In its occurrence area, it always appears in the form of single superior plant community, with dense patches all over Shan Ye, where plants of origin are "squeezed out", cattle and sheep pastures all disappear, cattle and sheep die of infertility or poisoning after eating, and the loss of animal husbandry is serious. At present, the occurrence area of this poisonous weed in Yunnan has reached tens of millions of hectares, which has seriously threatened the survival and development of many species in Xishuangbanna Nature Reserve.

Mikania micrantha is a herbaceous vine, native to Central and South America. Climbing and winding other plants can wither and die a forest, and there is no other grass anywhere. In the early 1980s, it spread from Hong Kong to Shenzhen, which made Dingling Island, a national nature reserve in Shenzhen, suffer greatly. There are more than 600 macaques and other key protected animals living on the island. These macaques feed on bananas, lychees, longan, wild oranges and some shrubs and trees. However, Mikania micrantha has spread in pieces, covering 40-60% of the 7000 mu forest on the island. 80% plants on the island are threatened with death, and many macaques have no food to eat and have to rely on artificial feeding to make a living. What's more, Mikania micrantha is rapidly spreading to the Pearl River Delta, and its distribution area is rapidly expanding, with the affected forest area reaching more than 40,000 mu. Since the 1960s.