Chemical control plans should always include three phases: 1) control, 2) maintenance, and 3) ecological restoration. Retrieved from: www.invadingspecies.com. The two industry trade bodies (PCA & INNSA) produced their own codes that provide the highest shared standards of best practice. Contact your local municipality to determine if plant material can be brought to their composting facility. 603-271-3488 . �����$�j����Z�?4L��~��Y���p&.��=�_��I��|b�LZ��9��,Z4�а�`Xg���گ�� *����4m1���;=Z��0.OW�Qr���#��zm�[���)9���e�Ҏ�b���$gV�}mdY���"V0�O��f��v�ǿ{péV��L?X�y+ۿA_�;��l%� Japanese knotweed is often mistaken for bamboo; however it is easily distinguished by its broad leaves and its ability to survive Ontario winters. Japanese knotweed is a shrub-like, semi-woody perennial growing up to 9 feet tall. Check before applying to knotweed in areas with standing water 1-2% glyphosate (aquatic-approved formulation) Best sprayed in late summer/early fall Spraying at ... Best Management Practices (BMP) and Treatment ; Knotweed treatments Theme . Wipe the sponge soaked with herbicide on the leaves and stem of the plants. Japanese Knotweed . Ontario Invasive Plant Council, Peterborough, ON. Do not move soil that may contain knotweed rhizome fragments to uninfested areas. <> This guide also details restoration options and knowledge gaps about Japanese knotweed. Japanese knotweed spreads primarily by seed (transported by wind, water, animals, humans, or as a soil contaminant), stem fragments, and by shoots sprouting from its system of rhizomes. In Ontario, it is mostly established in southern and central areas of the province where it mostly grows in gardens, along roadsides and near old buildings or former building sites. <>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Conservation Practice Job Sheet NH-595 . Use an applicator wand with a sponge on the end of a reservoir for the herbicide. Best management practices and target plant profiles Japanese Knotweed Scotch Broom Giant Hogweed June 2014. Species Profile - Japanese knotweed (Fallopia japonica), National Invasive Species Information Center, United States National Agricultural Library. These Best Management Practices (BMPs) provide guidance for managing invasive Japanese Knotweed (Fallopia japonica) in Ontario. Japanese Knotweed: This management guide provides information on the identification, dispersal, introduction history, management techniques of Japanese knotweed. In the 1800’s it was introduced to North America as an ornamental species and also planted for erosion control. of Practice – Managing Japanese Knotweed on development sites. You can also call Crime Stoppers anonymously at 1-800-222-TIPS (8477). The Code provides best practice advice and guidance aimed at contractors carrying out Japanese knotweed remediation works and will be useful for developers, planners and contractors who may encounter Japanese knotweed in … • BC Ministry of … Stems: <> Spreads quickly, creating dense thickets that degrade wildlife habitats. 1 0 obj The final of our Japanese knotweed management methods is the excavation of any and all soils containing the possibility of Japanese knotweed rhizome. Japanese Knotweed – Polygonum cuspidatum . 603-271-3488 . Use glyphosate at 33 to 75 % concentration (or as directed on product label). Related information: section i – general best management practices 6 soil disturbance and stabilization 7 movement and maintenance of equipment 8 mowing 9 disposal of plants 10 excavated material 12 section ii – nhdot priority invasive plant species 13 knotweed 14 purple loosestrife 17 phragmites 20 oriental bittersweet 23 spotted knapweed 25 Do not plant knotweed as an ornamental and eradicate any existing plants from your property. The aim of this Code of Practice is to provide guidelines that set the principles and … %���� Perth, ON. Planning Considerations • Survey the area for weeds, set priorities, and select the best control method(s) for the site. The Environment Agency's Japanese knotweed code of practice was originally published in 2006. Lists general information and resources for Japanese knotweed. Summary Findings from Knotweed Workshop Held March 2015 Native to Japan, China, Korea, and Taiwan, Japanese Knotweed was introduced to North America in the late 19th century as an ornamental plant, for livestock forage, and for erosion control 1, 2.. Japanese Knotweed is an invasive herbaceous perennial that grows in a variety of soil types and is highly adaptable to extreme temperatures, salinity, droughts, and floods 3. The guide to. The guide to Best Management Practices for Japanese knotweed describes the most effective and environmentally safe control practices for this species. Dense thickets can reduce sunlight penetration by more than 90% and its thick mats of dead and decaying vegetation in fall/spring prevent other plant species from growing by shading them out. As with most invasive plants, Japanese knotweed can quickly inhabit disturbed ecosystems. Ontario’s Invading Species Awareness Program is a partnership between the Ontario Ministry of Natural Resources and Forestry (MNRF), and the Ontario Federation of Anglers and Hunters (OFAH). It is found along roadsides, stream and river banks, wetlands, wet depressions and woodland edges, and can tolerate a wide array of soil and moisture conditions. Standards, "best practice" and technical guide for Japanese Knotweed. 99 Christie Lake Road. endobj In Canada, Japanese knotweed is established from Ontario to Newfoundland and is also found in British Columbia. Rhizomes: a large underground root system capable of producing new plants. As with the single mowing approach, allow at least six weeks after the last mowing before you spot treat the knotweed with glyphosate King County, USA, Best Management Practices for Knotweed For any organisation currently concerned about Japanese knotweed, INNSA’s new Code of Practice provides an excellent starting point to understand the issues surrounding the management of Japanese knotweed and the remedial actions required. It has since spread throughout the United States and Canada. %PDF-1.7 Control Methods for Japanese knotweed New Hampshire . Stay on designated trails and keep pets on a leash. Douglas Cygan . Invasive Species in Metro Vancouver: An Online Course . of Practice – Managing Japanese Knotweed on development sites. Japanese Knotweed (Polygonum cuspidatum) Japanese Knotweed, leaves. However, the Property Care Association - the UK's trade association for specialists who deal with … Japanese Knotweed is an invasive species that can produce a new plant in as little as six days. Control Methods for Japanese knotweed New Hampshire . Never buy or plant Japanese knotweed. Never buy or plant Japanese knotweed. The Code provides best practice advice and guidance aimed at contractors carrying out Japanese knotweed remediation works and will be useful for developers, planners and contractors who may encounter Japanese knotweed in … No matter the size of your infestation, completely eradicating this pest can take years [1]; cutting corners at any point in the process could lead to a never-ending battle or, worse still, a hefty fine. Prevent spread of Japanese knotweed. Japanese knotweed can block or interfere with access to water for activities such as canoeing, boating, angling, and swimming (Japanese Knotweed BMP). The BMP documents listed below for individual noxious weed species (or group of species) cover impacts, history, identification, reproduction and spread, local distribution, and control methods including prevention, manual, mechanical, biological and chemical methods, a summary of recommended best management practices for different sites, disposal guidelines and references for further … Japanese Knotweed(Fallopia japonica) Best Management Practices. x��}ێ$;r�� ��(8��&3�E�3=�,`�.�ABKZc1dž��}3nd�IVu�dkf�=�d%o�`����]~������?~�������w������?��_���fY]��%E��덻��>~���_/�YBL����]~����%p���_RJ��?�b��5E�/{n�M�a�/�ښe�p��wnw�D��ӲRi5vIԚ��~s#*��jfD=�D�s*�v���?������墀c8.+�e�/� ���?���K01� .,�&,�-��m��� "T�+JABe�ܒ;Y�m1��p `�a/\��p��{���Oadߤ� �=L���? Japanese knotweed (Fallopia japonica, P. cuspidatum) Giant knotweed (Fallopia sachalinense, P. sachalinense) Himalayan knotweed (Fallopia polystachyum, P. polystachyum) Buckwheat Family INTRODUCTION Identification Tips In the Pacific Northwest, there are four similar species of invasive knotweed that are difficult to tell apart and share © 2020 Ontario's Invading Species Awareness Program, Due to COVID-19, the OFAH has modified operations. Check, Best Management Practices for Japanese knotweed, Japanese Knotweed - Best Management Practices, Invasive Plant Species - Quick Reference Guide, Grow Me Instead (Southern Ontario) – Brochure, Grow Me Instead (Northern Ontario) - Brochure, Ontario Ministry of Natural Resources and Forestry, Ontario Ministry of Agriculture, Food and Rural Affairs – Ontario Weeds, Ontario Invading Species Awareness Program. Understanding & Controlling Invasive Knotweeds in BC by Jeff Hallworth. After several revisions, the publication was withdrawn on 11 July 2016: "This guidance has been withdrawn from use because the Environment Agency no longer provides best practice guidance." In 2006 the Environment Agency (EA) published a best practice document entitled “Managing Japanese knotweed on Development Sites – the knotweed code of practice”. Description. This invader is very persistent and once it becomes established, is incredibly difficult to control. Knotweed Information Sheet – Comox Valley Regional District. If you’ve seen Japanese knotweed or other invasive species in the wild, please contact the toll free Invading Species Hotline at 1-800-563-7711, or visit. BEST PRACTICE MANAGEMENT GUIDE FOR INVASIVE ALIEN SPECIES 2 GOOD PRACTICE MANAGEMENT GUIDE FOR Japanese knotweed (Fallopia japonica) Other names: Also known as Polygonum cuspidatum by Japanese and American authors but, following Meissner's 1856 classification, as Fallopia japonica in Europe endobj This guide also details restoration options and knowledge gaps about Japanese knotweed. How to identify Japanese knotweed.. This BMP was developed by the Green Ribbon Initiative and its partners and uses available research and local experience to recommend environmentally safe control practices. For more information on Japanese Knotweed, download our Best Management Practices and Technical Document, available at … Stay on designated trails and keep pets on a leash. Reduces plant biodiversity by competing with other native vegetation. This one-hour introductory course is intended to improve awareness, detection and control of invasive species in our region. doug.cygan@agr.nh.gov . PHASED APPROACH. �n. Learn how to identify Japanese knotweed and how to avoid accidentally spreading this invasive plant through its root fragments and seeds. These Best Management Practices (BMPs) are designed to provide guidance for managing invasive plants in Ontario. Wick Wipe. The BMPs were developed by the Ontario Invasive Plant Council (OIPC), and its partners to facilitate the invasive plant control … Mechanical control Single young plants can be pulled by hand depending on soil conditions and root development. … Because of knotweed’s incredibly extensive root … A strictly regulatory response to violations is not the most effective way to manage for Japanese knotweed. King County, USA, Best Management Practices for Knotweed. Japanese Knotweed - Best Management Practices (2.31 MB) Purple Loosestrife - Best Management Practices (1.20 MB) Reed Canary Grass - Best Management Practices (2.72 MB) For knotweeds, the control phase takes at least two seasons, and often includes at least two treatments in year one, followed by at least one treatment in year two. doug.cygan@agr.nh.gov . Semi-woody perennial plant capable of reaching 1-3 metres in height. (2012). Origin. Summary Findings from Knotweed Workshop Held March 2015 It can establish along riverbanks, where pieces of roots can break off and float downstream to start new populations. For small initial populations beyond single plants, or in environmentally sensitive areas wher… THIS PAGE IS INTENTIONALLY BLANK. One of the best ways to prevent its colonization is to ensure that disturbed habitats are rehabilitated with native vegetation before knotweed can invade. BC Government Information on Invasive Plants. Understanding & Controlling Invasive Knotweeds in BC by Jeff Hallworth. Pest Management – Invasive Plant Control . Leaves are simple, alternate, up to 6 inches long by 4 inches wide, and broadly ovate with pointed tips and a square base. Department of Agriculture, Markets & Food . Japanese Knotweed Code of Practice When the Environment Agency withdrew its ‘Knotweed Code of Practice’ in 2016 the industry took on the mantle of providing best practice guidance on managing knotweed. Japanese knotweed (Fallopia japonica) is an invasive perennial and noxious weed in PA. Leaves are ovate with a flat base, reaching 3-6 inches long and 2-5 inches wide with pointed tips. and management of Japanese Knotweed. Since we never made such a recommendation and since we think that, in order to successfully control invasions by Japanese knotweed s.l. Implementing best management practices for roadside maintenance activities and making minor adjustments to mowing schedules can control the establishment and spread of invasive weeds. These practices will also reduce future costly maintenance activities. ; syn. “The Environment Agency initially authorised the practice as a comprehensive guide to all those dealing with this problematic species. Department of Agriculture, Markets & Food . Japanese Knotweed Best Management Practices. Japanese knotweed can severely degrade the quality of wetland and riparian habitats where it becomes established. If glyphosate is applied correctly, at the appropriate time of year, it is possible to eradicate it, although it can take two to … Leaves can be up to 2.5 feet long, and flowers are greenish-white. It is therefore essential to implement control as soon as it is identified to avoid the risk of prosecution and fines. *C�VC��gKwy��F0�Y���A�eG#�ņ+C}�c��S�눌>���蒀 _”�������D�u�̀�?H�kc?_�N���^��@�����|�8�������h^@�eP�Q�.s�O�;$�2Ĭ4O��0 �t&zg�;\)��+�-��i@��9����0��RY�*�-�"�I�һ���|^"������P����u � �9 xp���'Y|��n-7 �4��O�[�� ���11������J����}�#����a��d���"v��q7Y��n�9�;B��~V_�K�(�4�ͪh�H�[+u�iڗ@]����}���Cv���0�Rj�������=�����";B���OAU#���/[ݗ��lz#��q�z4i�*`�u��\�� Aggressive plant with a strong root system that has been known to break through asphalt and concrete. The Environment Agency's Japanese knotweed code of practice was originally published in 2006. 2 0 obj 0����8������n��\��ߴ��������/����?g����]���y��#s���{�⾄���7s��'��?���~�n������z)y��~gK��� �,��P�Y�Ru��/u+�Hҳ��b����ִP��Ԟ�\���饎f�`E��[V�z�Шs��5͜;G���3��m[V^U��O�|�����%o������z���#��]�K3�=�����ęL��q1�bx��/5_`�k�������� L��@�4{)�Y�"���ln���+��Ƕ"�`�)�� ,nnG�s;bƆ�\tKʄ5s�uD2�.�!$��"�Y�ڭ ��ʯ��/��tH�W@y�_k[՟)3���Uۇ�cï(�7�#�M�7`�����7d3��vÙ��������_÷T ��k���\Ñp��E8�u�.�h��eru"��v����`�����,g/h�"�r�i��f64��ւf��YE�P����gU���=�Q�@&�~�Ѷ]Z�ƭ���s�8$}��E��� �4��_�¯�%�����7dykKW����8��D�O��yV׻YY������ 5�m���3�@�%��6��ݘ���6��d� Columbia: Japanese knotweed (Fallopia japonica), Giant knotweed (Fallopia sachalenensis), Bohemian knotweed (Fallopia x bohemica), and Himalayan knotweed ... Best Management Practices in Ontario. Best management practice A variety of ways to control knotweed (under "knotweed")(USA) Strategies for the eradication of Japanese knotweed This factsheet may be reproduced for non-commercial purposes. Welcome to the Property Care Association (PCA) code of practice for the management of Japanese Knotweed. Douglas Cygan . Thick layers of decomposing stems and leaves on the ground make it difficult for native plant species to establish. BEST MANAGEMENT PRACTICES Invasive Knotweeds Bohemian Knotweed, Japanese Knotweed, Giant Knotweed, Himalayan Knotweed (Polygonum bohemicum, P. cuspidatum, P. sachalinense, P. polystachyum) (Family— Polygonaceae —Buckwheat Family) Legal Status in Jefferson County: Class B noxious weed (non- Japanese Knotweed: Invasive Plant of Southwestern BC. Plants are able to survive severe floods and recolonize areas. This knotweed code of practice has been written for anyone involved in the development and haulage industry who may encounter sites with Japanese knotweed, or soil containing it. Giant knotweed (figure 3) is taller than Japanese knotweed. K7H3C6. endobj Welcome to the Property Care Association (PCA) code of practice for the management of Japanese Knotweed. OFAH/OMNRF Invading Species Awareness Program. This knotweed code of practice has been written for anyone involved in the development and haulage industry who may encounter sites with Japanese knotweed, or soil containing it. This BMP was developed by the Green Ribbon Initiative and its partners and uses available research and local experience to recommend environmentally safe control practices. These are then loaded into a large vehicle and transported to a licensed landfill site and then disposed of safely. How To Get Rid Of Japanese Knotweed. Heres a quick overview of the treatments ISN has found most successful for controlling knotweeds: Milestone (aminopyralid) Faster kill (~3 years), more off-target effects Standard rate (3-7 oz/acre; 0.01%) Using nonionic surfactant (standard rate) Late … Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. By Paolo Martini on 2nd July 2019 (updated: 18th November 2020) in News. Stems are round, reddish-purple, smooth and have a bamboo-like appearance. Japanese knotweed Japanese knotweed (Fallopia japonica), is an invasive herbaceous perennial (a plant that can live more than one year). The Early Detection & Rapid Response (EDRR) Network Ontario project aims to train and equip volunteers with the skills and resources needed to better detect and reduce invasive species in Ontario, one community at a time. Japanese Knotweed: Invasive Plant of Southwestern BC. This is especially important if you are planning to do work in an area which contains Japanese knotweed. … Ontario composting facilities monitor the compost process and meet provincially regulated temperature requirements. Fruit is small and white with wings that help to disperse seeds to new sites. … Forest and Range Practices Act- requires forest and range managers to specify and implement measures that prevent the introduction or spread of invasive plants, including knotweed species, within their forest stewardship plans, woodlot license plans, range use plans, and range stewardship plans. Effective management involves including best management practices as part of your overall plan – including ensuring that clean fill is used, vehicles are cleaned, and properties are inspected periodically throughout the process. It is an offence to plant or to cause Japanese Knotweed to grow on your farm. Knotweed Information Sheet – Comox Valley Regional District. Japanese knotweed (figures 1 and 2) can grow to 10 feet tall and has oval-shaped, sharply tipped leaves and white flowers. This Best Management Practice (BMP) document provides guidance for managing Japanese Knotweed in the Oak Openings Region of Northwest Ohio and Southeast Michigan. BEST MANAGEMENT PRACTICES Invasive Knotweeds Bohemian Knotweed, Japanese Knotweed, Giant Knotweed, Himalayan Knotweed (Polygonum bohemicum, P. cuspidatum, P. sachalinense, P. polystachyum) (Family— Polygonaceae —Buckwheat Family) Legal Status in Jefferson County: Class B noxious weed (non- This Best Management Practice (BMP) document provides guidance for managing Japanese Knotweed in the Oak Openings Region of Northwest Ohio and Southeast Michigan. Japanese knotweed is an aggressive semi-woody perennial plant that is native to eastern Asia. Learn how to effectively manage Japanese knotweed on your property. It is against the law to buy, sell, trade, propagate or purposely grow Japanese knotweed. To prevent the further spread and introduction of this unwanted invader in the province, Ontario has regulated Japanese knotweed as restricted under the Invasive Species Act. This document sets the principles, standards and guidelines to which qualified PCA members work. The code of practice below aims to provide a thorough and technical guide to the management of Japanese Knotweed. This article will assist with identification and provides recommendations for control, including a management calendar and treatment and timing table. Leaving trails or entering areas containing Japanese knotweed can encourage the spread of this plant. 15 i 1.0 ERAL PRACTICES FOR INVASIVE PLANT REMOVAL GEN 2.0 ERAL PRACTICES FOR RESTORATION PLANTING GEN 3.0ARGET PLANT PROFILES AND SPECIES SPECIFIC BEST MANAGEMENT PRACTICES 2T Invasive Plants of Southwestern BC: Japanese Knotweed. Who We Are. of the community and landowners. King County Noxious Weed Control Program KNOTWEED BMP 206-477-9333 Website: www.kingcounty.gov/weeds JULY 2015, Page 10. Japanese knotweed is semi-shade tolerant but grows best in full sun. MISC (Default) IPS Suite Original . After several revisions, the publication was withdrawn on 11 July 2016: "This guidance has been withdrawn from use because the Environment Agency no longer provides best practice guidance." Do not compost Japanese knotweed in your backyard composter. section i – general best management practices 6 soil disturbance and stabilization 7 movement and maintenance of equipment 8 mowing 9 disposal of plants 10 excavated material 12 section ii – nhdot priority invasive plant species 13 knotweed 14 purple loosestrife 17 phragmites 20 oriental bittersweet 23 spotted knapweed 25 Daniel Jones is Managing Director of Advanced Invasives that delivers a range of consultancy services, including how best to manage Japanese knotweed. Funding and leadership for the production of this document was provided by the Ontario Ministry of Natural Resources (OMNR). You will need to cut the knotweed earlier and more often to prevent it from canopying over your tree plantings. … Foreword. Japanese Knotweed: This management guide provides information on the identification, dispersal, introduction history, management techniques of Japanese knotweed. Understanding & Controlling Invasive Knotweeds in BC by Jeff Hallworth. Both seeds and rhizomes (horizontal plant stems growing underground) could survive and grow in compost, unless high enough temperatures are reached to kill the reproducing structures. Japanese knotweed is especially persistent due to its vigorous root system, which can spread nearly 10 metres from the parent stem and grow through concrete and asphalt. These Best Management Practices (BMPs) are designed to provide guidance for managing invasive plants in Ontario. JAPANESE KNOTWEED SITE SUPERVISION In some situations, where the client has machinery and labour on-site, we can provide site supervision (Watching Brief) to ensure removal in accordance to the Property Care Association (PCA) Code Of Practice. ��N"�y!� �ۍv2�7��eh+ �0��������q�;�N��2�G��1�Y���Ao� ��&�ɚ3q��hͩ�hZz}~S�͇ ON"�D�W��lo-k�R8aŦE�22,G�rS��u���v�Nh����|QH2! Greatly reduces drift. Japanese knotweed, also known commonly as ‘bamboo’, is a native of Japan that was brought to the Fallopia spp. Japanese Knotweed. Standards, "best practice" and technical guide for Japanese Knotweed . If all of the root system isn’t removed, re-sprouting can occur. Japanese knotweed showing oblate leaves and flowers. The plant develops small winged fruits Seeds: triangular, shiny, very small, about 1/10 inch (2.5 mm) long. Riparian management: Best Practice ... Japanese Knotweed is regarded as Britain's most invasive plant. Japanese knotweed is best controlled by the application of a suitable herbicide. 4 0 obj King County, USA, Best Management Practices for Knotweed. If you have any information about the illegal importing, distribution or sale of Japanese knotweed, report it immediately to the MNRF TIPS line at 1-877-TIPS-MNR (847-7667) toll-free anytime. <>/Metadata 506 0 R/ViewerPreferences 507 0 R/PageLabels 508 0 R>> Improvements on recommendations are based on experiential data of PCA members with long-standing proven records in Japanese Knotweed control. Tom Heutte, USDA Forest Service, Bugwood.org Japanese knotweed Fallopia japonica (Polygonum cuspidatum) Japanese Knotweed Best Management Practices. It is very difficult to manually control the spread of this species, and can have potentially devastating impacts on riparian areas or infrastructure. Management will require dedication for a number of years and should allow flexibility in methods. Plant populations are extremely persistent. It is against the law to buy, sell, trade, propagate or purposely grow Japanese knotweed. The Code of Practice laid out land managers’ and contractors’ responsibilities, as well as best practice for dealing with Japanese knotweed surface growth, rhizome and soils containing Japanese knotweed, and introduced many to the concepts of cross-contamination, clean sites, knotweed management plans and methods for remediation. Identify Japanese knotweed. Glyphosate-based herbicides are commonly used to treat Japanese knotweed. When leaving an area containing Japanese knotweed, inspect, clean and remove mud, seeds and plant parts from clothing, pets (and horses), vehicles (including bicycles and ATVs), and equipment such as mowers and tools. 3 0 obj Invasive Plant Council of BC – Knotweed. stream Since it was introduced as an ornamental plant in the 19th Century from Japan, it has spread across the island of Ireland, particularly along watercourses, transport The first record of Japanese Knotweed in Ontario is from 1901, in Niagara Falls and is now reported in many locations throughout southern Ontario, and as far north as Thunder Bay. The Early Detection & Rapid Response (EDRR) Network Ontario project aims to train and equip volunteers with the skills and resources needed to better detect and reduce invasive species in Ontario, one community at a time. Leaves: alternate and are oval to triangular in shape. Who We Are. There are two affective methods for controlling Japanese knotweed (Polygonum cuspidatum), henceforth referred to as knotweed… Y�'�'r�Ƅ��IF"�?]Y�P=? For more information on the Invasive Species Act and Regulations visit www.ontario.ca/invasionON. Japanese knotweed hybridizes with giant knotweed to form the Bohemian knotweed species. taxa (Reynoutria spp. You must prevent Japanese knotweed on your … Want more in-depth information? For more information on best manage-ment practices, see page 6. There is no quick fix to killing Japanese knotweed infestations. Bohemian knotweed (figures 4 and 5) is a hybrid of Japanese knotweed and giant knotweed and has Want more in-depth information? There are two affective methods for controlling Japanese knotweed (Polygonum cuspidatum), henceforth referred to as knotweed… Knotweed management is more complex if it's growing among planted trees (CP 3A and CP 22 practices). Disclosure statement. Japanese Knotweed flowers blooming in sprays. Claimed to be the most downloaded document in the history of the Environment Agency, the Code of Practice represented the highest shared standards of best practice within the knotweed removal industry.