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I could be mistaken here, but doesn't Roundup work by preventing photosynthesis? Meaning it has to be applied to green plant tissue? I was under the impression that you 'could' apply Roundup to a tree trunk all day long with little or no effect on the tree, but as soon as applied to leaves it will start to be effective.
I would go with Brushmaster for applying to the root system. Just need to be very cautious with any desirable trees that are to remain.
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