Japanese Knotweed              5/16/2012   Managing Aquatic Resources Since 1966
Invasive Species Japanese Knotweed Buckwheat family  (Lythraceae) Scientific Name: Fallopia  japonica Previously: Poly...
Distribution Native to Asia Colonized the United States in Late 1800’s Introduced as an ornamental and for erosion cont...
Description/Identification Herbaceous shrub 3-12 ft. tall Reddish, hollow, and jointed stems Alternate leaves are 4-6 i...
Flowers Flowers May to September Flowers terminal and auxiliary Branched sprays (racemes) 3-6 inches long Covered with...
Fruit August – November Dangling Winged 1 triangular shiny nutlet
Life Cycle Stems and leaves survive one season Rhizomes survive many years Grows fast in spring from rhizomes and seeds...
Dispersal Mechanisms Ornamental trade Fragmentation Disturbance colonization    Riparian flooding    Roadway mowing
Impacts Alters natural ecosystem Crowds out native vegetation Dense stands provide limited wildlife habitat Causes str...
Control Options Education/Prevention Physical Biological    Aphalara itadori Chemical
Chemical Control Options Renovate 3 as 2% solution Glyphosate   Foliar application with 2% solution   Cut-stem applica...
Japanese Knotweed SherbetThis sour rhubarb relative lends its lemony flavor and thickeningqualities to this sweet-tasting ...
Questions?Managing Aquatic Resources Since 1966
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Japanese Knotweed

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Presentation on the invasive Japanese knotweed.

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  • I have recently attended a seminar on Japanese Knotweed, which identified the control solution Stem Cell Injection, which targets individual plants, using the plants natural biological system to transmit and spread the chemical agent throughout its roots.

    This seems to be far better at eradicating the invasive plant without requiring hugely disruptive land excavation, time consuming soil sifting, or the environmentally damaging chemical treatment process.
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Japanese Knotweed

  1. 1. Japanese Knotweed 5/16/2012 Managing Aquatic Resources Since 1966
  2. 2. Invasive Species Japanese Knotweed Buckwheat family (Lythraceae) Scientific Name: Fallopia japonica Previously: Polygonum cuspidatum Common Names: Japanese knotweed, fleece flower, Mexican bamboo, huzhang
  3. 3. Distribution Native to Asia Colonized the United States in Late 1800’s Introduced as an ornamental and for erosion control Presently found in a significant portion of North America
  4. 4. Description/Identification Herbaceous shrub 3-12 ft. tall Reddish, hollow, and jointed stems Alternate leaves are 4-6 inches, ovate with pointed tips and flat bases
  5. 5. Flowers Flowers May to September Flowers terminal and auxiliary Branched sprays (racemes) 3-6 inches long Covered with tiny 5-petaled (sepaled) white to greenish flowers 3 styles and 8-10 stamens
  6. 6. Fruit August – November Dangling Winged 1 triangular shiny nutlet
  7. 7. Life Cycle Stems and leaves survive one season Rhizomes survive many years Grows fast in spring from rhizomes and seeds Crowds/shades other species Prefers open areas such as riparian corridors, roadways, etc. Does well in wetlands
  8. 8. Dispersal Mechanisms Ornamental trade Fragmentation Disturbance colonization  Riparian flooding  Roadway mowing
  9. 9. Impacts Alters natural ecosystem Crowds out native vegetation Dense stands provide limited wildlife habitat Causes structural damage to buildings, sidewalks, roads
  10. 10. Control Options Education/Prevention Physical Biological  Aphalara itadori Chemical
  11. 11. Chemical Control Options Renovate 3 as 2% solution Glyphosate  Foliar application with 2% solution  Cut-stem application (label details) Combination of Glyphosate (2%) and Renovate (1%) Habitat as 1% solution Early treatments prevent seed production Late season treatments are more effective on rhizomes
  12. 12. Japanese Knotweed SherbetThis sour rhubarb relative lends its lemony flavor and thickeningqualities to this sweet-tasting sherbet.3 cups Japanese knotweed stalks,peeled if desired, coarsely sliced1-1/3 cups orange juice (freshly squeezed is best)1-1/2 cups apple juice or other fruit juice1/2 cup lemon juice1/4 cup canola oil1/4 cup vegetable glycerin, honey, barley malt, or rice syrup1 tbs. freshly grated (or 1 tsp. dried) orange rind2 tsp. vanilla extract1 tsp. lemon extract1 tsp. liquid stevia (optional)1/4 tsp. salt1.1. Simmer the Japanese knotweed shoots in the orange juice, apple juice,and lemon juice 10 minutes or until soft.2. Puree in a blender with the remaining ingredients.3. Chill.4. Pour into an ice cream machine and run it until done.
  13. 13. Questions?Managing Aquatic Resources Since 1966

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