Multiple Year Knotweed Injections

[Nor Serocki]

I've recently had a homeowner coming up with the issue that in his third year of Knotweed treatment, more than 50% of the stems are too small to inject. Has anyone else run into this issue? What have you done once most of the stems can't be treated through injection? Thanks!

[Fallon Januska]

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).

[Elise Desjarlais]

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!

[John D]

I've run into this problem, and as others have said, a foliar treatment has been the solution. Once density allows for it, cut-and-paint is similarly effective and as precise as stem injection.