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Michigan's Invasive Species Community

Multiple Year Knotweed Injections

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I had a few sites this year that the landowner preferred injection, but the stems were too small to inject. Most of these landowners understood and were so happy treatment had seemed to be working, that they were okay with a foliar treatment this year. However, another option would be a cut and fill the stem cavity (recommend using a pipette).

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Many of our injection sites even the following year were too small for the needle to be of much use. We were able to switch to foliar, and the landowners generally are happy enough that we were coming back to continue treating they didn't seem to mind the change in application. We did do a pretty thorough explanation of why we had to switch, though. Hope you find a similar scenario!

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