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Japanese Knotweed

日本の雑草. Japanese Knotweed. “The invasion of exotic weeds such as Japanese Knotweed and its impact on native plants through inter specific competition.”. 日本の雑草. An Introduction. Originated in Asia Used as an ornamental plant Can grow up to 3m tall Extremely resistant. Young shoots emerging.

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Japanese Knotweed

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  1. 日本の雑草 Japanese Knotweed “The invasion of exotic weeds such as Japanese Knotweed and its impact on native plants through inter specific competition.”

  2. 日本の雑草 An Introduction • Originated in Asia • Used as an ornamental plant • Can grow up to 3m tall • Extremely resistant Young shoots emerging

  3. 日本の雑草 Latin Names and Classification Details • Japanese knotweed belongs to the plant family Polygonaceae • Three scientific names: Reynoutria japonica, Polygonum cuspidatum, Fallopia japonica. • The scientific name of Japanese knotweed in current use is Fallopia japonica.

  4. 日本の雑草 The Problem • The main problem; This plant is INVASIVE!!! • Reproduces asexually so is a single clone • Is thought to occupy thousands of acres of Britain. • Total mass has been estimated at 62,000 tonnes. Typical JK urban invasion

  5. 日本の雑草 Stats

  6. 日本の雑草 Economic Impact • Government estimates control costs to be in the region of £1.56 billion. • Indicates the extent of the problem. • Swansea will experience most cost problems as it is the worst affected area. • Swansea would cost around £9.5 million. • If this increasing epidemic is not controlled this weed will spread at 2ha/yr.

  7. 日本の雑草 The Solution • The aim of any control programme should be to target the rhizomes. • Chemical treatment is proven to be most effective. • Requires a number of herbicide treatments over several years before it is completely eradicated.

  8. 日本の雑草 References • http://www.cabi-bioscience.org/html/japanese_knotweed_alliance.htm By Anu, Becki and Foz

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