If the top is turning yellow and thinning, how much time do you have before it turns into a punky dangerous mess? I have one at least 90 feet tall, maybe 20-30 ft to the first branch with a very wide crown and large branches in all directions. It would make a mess of the undergrowth if I cable and pull it. Last summer I was going down the Highway 40 mile from me and there were a lot of farmsteads with dead ash. So I know it’s coming sooner or later. My grove is 70 years old. Had 2 rows of elm on the west and north side. Lost those in the 70’s and now it’s Dukes Mixture of ash, walnut, mulberry, hackberry, silver maple. Most of the inner two rows of mixed pine have died out and were replanted with arbor vitae and a sort of eastern cedar. Getting too old to handle some of this tree maintenance. At any rate, thanks for the replies gentlemen. Onward through the fog.