We know from the Japanese knotweed psyllid that it can kill young shoots and slow down or even stop the growth of the plant by sucking up sap – nutrition – from the plant. It is about 2mm in length and capable of causing significant damage to the target weed. By Spooky onMay 9th, 2019 Category: News. After extensive testing and review by federal agencies (USDA/APHIS), on March 20th, 2020, the Knotweed Psyllid (Aphalara itadori) was approved for release in the U.S. as the country’s first biocontrol agent for Japanese knotweed. It is the juvenile nymphs that cause the most damage to the plant and so where the adult psyllids choose to lay their eggs is highly important. But with no natural enemies in the UK it soon raged out of control, wiping out surrounding vegetation and threatening wildlife. Aphalara itadori, the Japanese knotweed psyllid, is a species of psyllid from Japan which feeds on Japanese knotweed (Fallopia japonica). The psyllid preferred the knotweed to buckwheat, and it showed little aptitude for establishing itself in the crop. Japanese knotweed is a fast-growing and strong clump-forming perennial, with tall, dense annual stems. The psyllid release programme began … Their chosen insect is a small psyllid called Aphalara itadori that feeds on the sap of the superweed, stunting its growth. The psyllid Aphalara itadori will be the first biological control used against Japanese knotweed, as well as the related Bohemian and giant knotweeds. We know from the Japanese knotweed psyllid that it can kill young shoots and slow down or even stop the growth of the plant by sucking up sap - nutrition - from the plant.' Japanese knotweed is highly damaging. Japanese knotweed is one of the most high profile and damaging invasive weeds in Europe and North America. The fast-growing plant can grow up to 13 feet tall and is so strong it can break through paving stones and tarmac. Current projects include hemlock woolly adelgid, emerald ash The Government also notes that DEFRA is funding a biological control programme through the release of a psyllid insect to tackle Japanese knotweed and that research is underway into the use of leaf-spot fungus as a mycoherbicide to control the knotweed. The project is entering the final stages of research and has identified two potential options, the Aphalara psyllid and a Leafspot fungus for the natural control of Japanese knotweed. What is Japanese knotweed? Japanese Knotweed, scientifically known as Fallopia japonica, is an Asian plant with a reputable ethnobotanical value among the Japanese. The Department for Environment, Food and Rural Affairs (Defra) and the Welsh Government have approved the release of the psyllid, Aphalara itadori to help stop the spread of Japanese knotweed. Biological control measures for Japanese knotweed are currently being researched, including the use of a psyllid from Japan as a suitable, safe agent to control Japanese knotweed in the UK. Japanese knotweed (Polygonum cuspidatum) is usually found in wet habitats, along river and stream banks, and in disturbed areas such as roadsides and old fields. The leaf flea, also known as the Japanese knotweed psyllid (Aphalara itadori), is a natural predator of knotweed. Japanese Knotweed and Psyllid and on the Walnut Creek Greenway. This is the invasive Japanese Knotweed, a noxious weed that can take over wet areas. Japanese Knotweed – An Invasive Plant That Is Proving Impossible to Control. And the threat is real: it can lower house prices, threaten our bridges, and drive men to madness. Research however has identified a tiny psyllid from Japan as a suitable and safe agent to control Japanese knotweed in the UK. Japanese knotweed can grow in a wide range of habitats, but is most often found in riparian areas. It spreads extremely quickly, preventing native vegetation from growing and has significant impacts on infrastructure. Last Modified: Dec 18, 2020 Print. Current UK control methods. Suzanne Lommen of the Institute of Biology Leiden coordinates the field trials. Start now. Japanese knotweed was first found in the wild in Wales in the 1880s. APHIS Extends Comment Period for Environmental Assessment for the Release of the Japanese Knotweed Psyllid to Biologically Control Japanese, Giant, and Bohemian Knotweeds. The species forms monospecific thickets of plants 2 to 4 meters tall. “If the psyllid can establish, reproduce and spread, and do the damage we see in the breeding trials, it can hopefully inhibit the growth and spread of Asian knotweed. Japanese knotweed is in nearly all our provinces. With its clusters of pretty white flowers, Japanese knotweed was first introduced as an ornamental plant. Public consultation news update regarding the ministerial approval by Defra on 9 March 2010 to release the psyllid. In Vermont, knotweed covers miles of shoreline on every major river in the state. Dr Kate Constantine, from CABI, said: 'The results confirmed the psyllid to be a high-specialised natural enemy of Japanese knotweed. Monitoring is continuing. On thinglink.com, edit images, videos and 360 photos in one place. Cookies on Japanese Knotweed Alliance. In these areas, native vegetation is all but eliminated. “If the psyllid can establish, reproduce and spread, and do the damage we see in the breeding trials, it can hopefully inhibit the growth and spread of Asian knotweed. Consent for experimental releases of the psyllid, Aphalara itadori was granted by Fera and Welsh Government in 2010. It has hollow stems with distinct raised nodes that give it the appearance of bamboo, and they may reach a maximum height of 3m each growing season–4 (Royal Horticultural Society, 2018). Britain is quite fortunate when it comes to having invasive plants because as a country we have very few. Add text, web link, video & audio hotspots on top of your image and 360 content. The deep-rooted knotweed … Description. 1 Release and Evaluation of Impact for the Knotweed Psyllid (Aphalara itadori) in the Northeastern Area (MA, VT, NH and NY) on Japanese Knotweeds (Fallopia japonica, F. bohemica and F. sachalinensis) The Team Roy Van Driesche (PI) is an entomology professor at the University of Massachusetts, specializing in biological control. The team has spent several years trying to find potential candidates to control the spread of Japanese knotweed, looking for predators that feed only on knotweed and not on any of Britain's native plants. 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