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Japanese Knotweed
Chanty Mapfumo, Brian Sibrian Hernandez, Seth Pickett
How did it get here?
• The Japanese Knotweed arrived in the late 1800‘s.
• It was used mostly for decoration.
• It spread all over the U.S. and Canada.
How bad is the current situation?
In areas like Texas and California people are still finding ways to get rid of it. It’s a problem in people’s gardens because it’s not only on one place it spreads all over. It’s in many others.
Affect on the ecosystem including Natives?
• Damage to flood defense structures.
• Reduction in land values.
• Expensive to treat.
• Aesthetically displeasing
• Damages to paving and tarmac areas.
Future Complications?
• Kills native plants• Spreads too rapidly• Take over swamp and
river areas.
Previous control and/or eradication efforts.
• Scientists advise that you dig up everything including the roots.
• Dispose of them properly.
• Bag fruit and roots in a tight back and throw away.
Map of invasion.
• The red is where the Japanese knotweed is invasive in Oregon.
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