Quote:
Originally Posted by Pondboy
Just thinking….what you could also do ; if the shrub does not have too many branches (the more branches, the more tedious of a task) coming from the root ball. Cut those branches a few inches above the ground, then take a paintbrush and dip it into straight Round Up and “paint” the stubs of the shrub. This will help prevent any overspray (getting onto the oak) and ensure a good, quick kill.
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This won't work, and Roundup getting on the roots or trunk of an oak will not hurt it at all. You need to spray foliage for Roundup to work at all.