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''Mikania micrantha'' is a tropical plant in the Asteraceae; known as bitter vine, climbing hemp vine, or American rope. It is also sometimes called mile-a-minute vine (a moniker also used for the unrelated ''Persicaria perfoliata''). It is a vigorously growing perennial creeper that grows best in areas in high humidity, light and soil fertility, though it can adapt in less fertile soils. The featherlike seeds are dispersed by wind. A single stalk can produce between 20 and 40 thousand seeds a season.〔Lalith Gunasekera, ''Invasive Plants: A guide to the identification of the most invasive plants of Sri Lanka'', Colombo 2009, p. 105–106.〕 The species is native to the sub-tropical zones of North, Central, and South America.〔(''Invasives'', February 2007 ).〕 ==Invasive species== ''Mikania micrantha'' is a widespread weed in the tropics. It grows very quickly (as fast as 80 to 90 mm in 24 hours for a young plant) and covers other plants, shrubs and even trees.〔 Lalith Gunasekera, ''Invasive Plants: A guide to the identification of the most invasive plants of Sri Lanka'', Colombo 2009, p. 105–106.〕 ''Mikania'' is a problem in Nepal, covering more than 20% of the Chitwan National Park.〔(news.bbc.co.uk )〕 Various control measures against ''Mikania'' have been tried in many countries. It is moderately susceptible to the herbicides 2,4-D and 2,4,5-T and paraquat. ''Cuscuta'', a parasitic plant, has been used in Assam and Sri Lanka to suppress the spread of ''Mikania'' from waste land to tea planatations. Other control measures are ''Puccinia spegazzinii'' fungus and ''Liothrips mikaniae'' insects. An example of its success can be seen in Hong Kong where, first recorded in 1884, it has now spread throughout the region and invades its country parks.〔(【引用サイトリンク】title=About Mikania )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mikania micrantha」の詳細全文を読む スポンサード リンク
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