I have seen sprout growth off of some larger trees but the bugs get those as well. I have one customer ,my buddies dad who is always right in everything, who wanted me to cut out the deadwood out of his heavily infested ash that had sprouted out and well on its way to be a bush. We had the polar vortex deep freeze, that’s -50*f air temp for you warm weather folks, that stalled EAB for a year and half and by year two it’s a bush of dead wood frozen in time. He probably hasn’t called me because he would have to admit he was wrong.