Decay in Beech tree stump

[larryno1]

Hi just wanted to see if anyone had an idea of this decay is in this beech stump, we took the tree down today the affected area seemed to be from ground level to 3ft above the base .

[detritus21]

I imagine the initial cause will have been mechanical damage from a mower or strimmer leading to exposure of the cambium layer and subsequent decay. The spalting is an attempt at CODIT

[treeseer]

I imagine the initial cause will have been mechanical damage from a mower or strimmer leading to exposure of the cambium layer and subsequent decay. The spalting is an attempt at CODIT

 

The infection seems to have begun in a sinus (concave area), where mechanical damage would be unlikely.

 

Perhaps self-damage from included bark is a factor.