My neighbor wanted to cut down a large red oak in his yard. He enlisted my help and said I could have half the wood. When we got down to the last piece above ground level it had brown soft material in the center 1/3 of it. This was previliant by the ground and become less common towards the end of that 18" piece. What is this called or what causes it. Rest of tree was fine and it was a 80 foot tall oak.
Thanks,
Dave
Thanks,
Dave