I've always painted stumps with concentrated glyphosate (or Roundup). Just need to go around the outer ~ 1/2 inch or so to get the cambiem. This has worked on bigger stumps. Recently, on some Trees of Heaven, I drilled 1/2 inch holes about 3/4 to 1 inch deep around them and squirted maybe 5 cc of concentrated glyphosate into the holes.
Did this with paiinting of stumps of Autumn Olive winter before last, but it did not stop most of them. Lots have several little sprouts growing up 8 to 10 inches out of the stump on. Also have several that have come up from seed elsewhere, plus some oriental bittersweet that did the same.
Had one landscaper outfit come in and got an estimate: about $3,200 and 64 gallons of herbicide estimated. Waiting for a 2nd one to give their estimate. This first outfit has little environmental responsibility.
Thinking now of using the double glove technique: put nitrile gloves on over both hands and then put a cotton glove over a nitrile on one hand. Saturate glove with glyphosate and smear upright plant (all small) through the glove. Hoping my legs will improve via acupuncture now to allow me to do this. The wife does not want to mess with the stuff, but I may get her to carry the bucket of mix (won't need full strength on foliage but higher strength than normal).
