Danger overhead: When an old oak shows signs of rot.
The most common cause of failure of trunks, large branches and roots of trees is decay from wood rot. More than a thousand different species of fungi can cause wood deterioration and decay that destroy the plant’s internal structural components – cellulose and lignin – potentially rendering them unable to support their own weight when stressed by heavy winds or rains.
http://www.sacbee.com/entertainment/living/home-garden/garden-detective/article191668834.html
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