Among them, eight invasive plants, such as water hyacinth, Alternanthera philoxeroides, Spartina alterniflora and Mikania micrantha, have brought serious harm to agriculture and forestry, and the most serious pests are 14, including American white moth, pine wood nematode and potato beetle. The 16 harmful alien species announced by the State Environmental Protection Administration are Eupatorium adenophorum, Mikania micrantha, Alternanthera philoxeroides, ragweed, poisonous wheat, Spartina alterniflora, Eupatorium odoratum, Eichhornia crassipes, false sorghum, Eupolyphaga sinensis, Dendroctonus xylostella, and Africa. /view/39004.htm? Fr=ala0 Baidu downloads a lot. Known as the "purple devil", the rampant reproduction of water hyacinth (commonly known as "water hyacinth" in China) in the waters around the world is the most typical example of alien species invasion. 1884, Eichhornia crassipes, which originated from Venezuela in South America, was sent to the Expo in New Orleans, USA. People from all over the world saw its gorgeous flowers and brought them back to their respective countries as ornamental plants. Little did they know that Eichhornia crassipes, which has strong reproductive ability, has since become the number one harmful plant in all countries. In Africa, Eichhornia crassipes is all over the Nile; In Thailand, Eichhornia crassipes is covered with Chao Phraya River; In the southern part of the United States, the inland river along the Gulf of Mexico is also blocked by dense layers of Eichhornia crassipes, which not only leads to the impassability of ships, but also leads to the extinction of fish and shrimp, and the river stinks; Dianchi Lake in Yunnan, China, was also accused by experts of suffering from "ecological cancer" because of the crazy spread of water hyacinth. Author: 0 fans of Shangguan Yiyi 2007- 12-30 15:30 Reply to this speech 4 Reply: Biological invaders ... data case (2) In addition, the "rabbit disaster" in Australia, the "poisonous algae" in the Mediterranean, the "zebra mussel" in the Great Lakes of the United States and the "frog mussel" in Hawaii. Due to the lack of natural enemies, these foreign invaders not only destroy the food chain, threaten the survival of other creatures, but also bring huge economic losses to the world. According to the report of the International Union for Conservation of Natural Resources (IUCN), the economic losses caused by the invasion of alien species to the world exceed 400 billion US dollars every year. Fujian relies on science and technology to fight against biological invasion Date: 2009-12-1Author: China Environmental News, 8th edition, copy link According to China Broadcasting Network, Fujian Province, which is located in the frontier of biological invasion, has stopped the proliferation of alien harmful species with effective scientific research results in recent years and achieved certain results. Bactrocera dorsalis is a worldwide fruit killer, which seriously harms more than 250 kinds of fruit trees and vegetables, and the country loses tens of billions of yuan every year. Through research, experts in Fujian province found a biological method to deal with Bactrocera dorsalis. The staff first captured the male Bactrocera dorsalis and irradiated them with a certain amount of cobalt 60 rays, making them lose their fertility. Then, the staff will release these flies back to nature. In this way, after mating, females and males will not have children. Alternanthera philoxeroides, which originated in Brazil, spread all over ridges, rivers and vegetable fields, competing with crops for water and fertilizer, becoming a malignant weed. Fujian Academy of Agricultural Sciences has effectively curbed the ecological damage caused by this harmful grass by using lotus grass which specializes in Alternanthera philoxeroides. In order to avoid the flooding of water hyacinth, Fujian agricultural scientists and technicians have found a way to kill water hyacinth by spraying mixed herbicides through research. A new method developed by Fujian Academy of Agricultural Sciences is expected to make water hyacinth a water purifier for rivers. The wild growth of Spartina in the tidal flat occupied the tidal flat, causing a large number of organisms such as fish, shellfish and algae to lose their breeding places, and was called the "tidal flat killer". In eastern Fujian alone, the direct economic loss caused by fishing is more than 464 million yuan every year. The reporter learned that Fujian Agriculture and Forestry University, Academy of Agricultural Sciences and other units have also found ways to deal with the growth of Spartina, which can make Spartina rot in the beach and turn it into sea mud.