2-4D is actually labeled for this (Yes I read the label). You cut it off and put a 2-4D soaked towel or paper towel on top of the trunk. Don't dilute it, just soak up the towel. It will soak it up for long periods of time and 2-4D is absolutely murder to anything broad leaf.
Be cautious though. Use 2-4D Amine. Don't use Low Vol or ester. If it gets above 80 it will volitalize (turn from liquid to gas) and damage your bushes.
I thought you had to have a private applicators license to buy Roundup Tordon or 2-4D. Maybe you don't anymore. If you get ahold of some without a private applicator license. If you get some, be sure it hasn't been diluted.
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