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Megan Rider

Best found control for Japanese Knotweed

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Hello! I am looking into different ways people have treated Japanese Knotweed, more for a large scale area but am curious about smaller areas as well. I am curious if there have been any new findings that I may be missing, other than the DNR page: https://www.michigan.gov/documents/dnr/knotweed_BCP_372280_7.pdf. Thanks in advance for the input! 

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Here are a few resources discussing stem injections for knotweed. The typical recommendation is using an undiluted concentration of glyphosate and injecting each stem with 3-5ml. This does not work on small canes (canes need to be about 1/4 inch diameter or larger) so smaller plants may need to be hand-swiped or foliar sprayed. Hope that helps!

http://www.weedwarriors.us/Knotweed project on May Creek 2010/Knotweed IPM Profile & Information.pdf

https://www.invasive.org/gist/moredocs/polspp01.pdf

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For anyone else interested, there is also a hollow stem injection section on page 9 of the Rodeo label that addresses max application for injection. "Do not apply more than a total of 8 quarts of this product per acre for all treatments combined.  At 5 mL per stem, 8 quarts will treat approximately 1420 stems per acre." Of course, rates will change by the herbicide you choose to use, but I found this helpful.

Rodeo_Label.pdf

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