This second map shows the currently known distribution of other invasive knotweeds in Devon. Download Data × To download a subset of this species' records : Click Here To download all available records in EDDMapS for this species Click Here. In Swansea alone the infestation has been estimated to weigh 62,000 tonnes, which equates to 400 blue whales! It can also create a fire hazard in the dormant season. This first map shows the known distribution of Japanese Knotweed in Devon in 2011. & Zucc. All four varieties (Japanese, Giant, Himalayan and Bohemian) are considered Washington State Class B noxious weeds and are required to be controlled in the Salmon Creek watershed. Scroll down to see the change in distribution in 2018. If you would like to, you can learn more about the cookies we use. This map shows the distribution of red and grey squirrels in 1950, compared with 2018. Japanese Knotweed is listed under Schedule 9 to the Wildlife and Countryside Act 1981 with respect to England, Wales and Scotland. Japanese Knotweed. Japanese knotweed This plant and synonym italicized and indented above can be weedy or invasive according to the authoritative sources noted below.This plant may be known by one or more common names in different places, and some are listed above. ... Marine Map - 50km Distribution of the number of records recorded within each 50km grid square (WGS84). To add this map to your own website, copy and paste the code shown below to your site's HTML. The majority of sites have been reported in the last 10-20 years. Japanese Knotweed Solicitors. japonica, Polygonum compactum, Polygonum compactum, Polygonum cuspidatum, Reynoutria japonica, Reynoutria japonica var. Do not however change both width and height since you may distort the map. This species is Introduced in the United States. Distribution of Himalayan Balsam reports. This species is Introduced in the United States. Species image. Overview; Gallery; Names; Classification; Records; Literature; Sequences ; Data Partners + Online Resources. means you agree to our use of cookies. It is difficult to control once established. CABI is a registered EU trademark. 477 (Ireland), National Biodiversity Data Centre, Ireland, Japanese Knotweed (Fallopia japonica), accessed 21 December 2020, , National Biodiversity Data Centre, Ireland, Japanese Knotweed (Fallopia japonica), image, accessed 21 December 2020, . & Zucc. It is native to Asia (China, Indian Subcontinent, Indochina) and grown as an ornamental in other countries. Negative - Subject was not present at time of report.. It has been reported from riverbanks and islands, wetlands, along roadways, hillsides, and disturbed areas in a variety of soil types and pH’s. It occurs in gardens, on road verges, railway embankments, riverbanks and waste ground. Ireland’s Global Biodiversity Information Facility (GBIF) Node, © 2020 - National Biodiversity Data Centre | Web Design Vitamin Studio. Overview; Gallery; Names; Classification; Records; Literature; Sequences ; Data Partners + Online Resources. distribution in the project area. 6 So far, all Japanese Knotweed stands recorded in Ireland are female (Invasive Species Ireland, 2019), indicating there is no reproduction through seed dispersal (Kelly, et al., 2015). Japanese knotweed can grow in a wide range of habitats, but is most often found in riparian areas. See the Knotweed distribution map of the Salmon Creek Watershed. mechanical, chemical, etc.) Species Detail - Japanese Knotweed (Fallopia japonica) - Species information displayed is based on all datasets. The data centre is funded by the Department of Culture, Heritage & the Gaeltacht and the Heritage Council. Japanese knotweed can also tolerate adverse conditions such as high temperatures, high salinity, drought and floods. Copyright © 2020 CABI. ex Maxim. This is to ensure that we give you the best experience possible. Distribution. Its distribution also covers much of mainland Europe from southern France and northern Italy to Norway. See the Knotweed distribution map of the Salmon Creek Watershed. It is often found in waste places, gardens, roadsides and stream and riverbanks. See how far it is from your area with our Japanese Knotweed distribution Map covering all the hotspots.. Distribution Maps Species Information Tools & Training My EDDMapS About Japanese knotweed Reynoutria japonica Sieb. Ronse Decr. In eastern and western North America, Japanese Knotweed (Fallopia japonica) has proven to be a particularly difficult species to control. Stems: Japanese knotweed stems are hollow, smooth, purple to green coloured, and up to 2.5 cm in diameter.The hollow-jointed stems have reddish-brown solid nodes surrounded by a papery sheath. ... 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