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Presentation on the invasive Japanese knotweed.
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Japanese Knotweed5/16/2012
Managing Aquatic Resources Since 1966
Invasive Species Japanese Knotweed Buckwheat family
(Lythraceae) Scientific Name: Fallopia
japonica Previously: Polygonum
cuspidatum Common Names: Japanese
knotweed, fleece flower, Mexican bamboo, huzhang
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
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
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
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 Crowds/shades other species Prefers open areas such as riparian corridors, roadways,
etc. Does well in wetlands
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 structural damage to buildings, sidewalks, roads
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 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
Japanese Knotweed SherbetThis sour rhubarb relative lends its lemony flavor and thickening qualities to this sweet-tasting sherbet.3 cups Japanese knotweed stalks, peeled if desired, coarsely sliced
1-1/3 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.
Questions?
Managing Aquatic Resources Since 1966