I use a small sponge brush to apply Tordon on something woody I can't dig out. Don't spray Tordon and after reading your info. won't. In a rare case I use Kilz All (round up wanta-be) to kill anything green, as like you said doesn't leave residue. Another neighbor has bee hives and we have had bees in our sycamore tree for 30 yrs. so we are careful what we do. Thanks,Dick
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