Here goes. I have two stands one tulip poplar, the other oak. Both planted about 25 years ago. I need to thin these. I've had the property about 5 years and been running a bush hog between the rows. Two questions: (1) Can I gird or hack and squirt the oaks I want to remove with a herbicide without affecting the adjacent ones? They're a pain to cut because they hang up in the canopy. The poplars don't. (2) For both poplars and oaks, where the bush hog can't get I have the nasties (sweet gum, privit, etc.) coming up. These are right at the base of the trees. I don't want to hack and squirt or stump treat in this case. I have been using a brush cutter on them. Can I safely hit the re-sprouts with glyphosate with effect?