1 Iritis is uncommon, but can be due to trauma, infections, or autoimmune conditions. Symptoms include pain, red eye, and often, decreased vision.  Optic neuritis. The nerve travelling from the back of the eyeball into the brain can become inflamed.
Oak root fungus, or white rot, is a widespread disease that becomes visible just beneath the bark and on roots. What looks like layers of light brown to tan mushrooms form in clusters at the base of the trees.
They go after a large number of trees that include the eucalyptus, maple, poplar, oak, walnut, yew, chestnut, birch, ash, pine, spruce, and cherry. The sulfur mushroom fungus is one of the most serious causes of decay in oaks and one of very few fungi that attacks yew trees. They grow from two to 12 inches wide and are soft and moist.