Sugar Maple Core Rot?

[bigschuss]

I wonder if is heart rot fungus. I have seen more than one tree break off 20’ or so above the ground, and find that it is hollow.

One tree guy here blames it on acid rain weakening the trees and allowing the fungus to take hold.

Interesting. I live in a fairly cold and snowy spruce and fir swamp. I see a ton of evergreens come down that are alive and healthy looking, but that have a hollow core.