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.
Tree fungus grows directly on tree limbs, producing mushrooms, conks and other fungal-fruiting structures. Pruning infected limbs with a disinfected pruning saw and disposing of them away from the tree keeps the fungus from spreading. Spraying tree limbs and leaves with a combination of Bordeaux mixture and water until saturated kills the fungus. One tablespoon of Bordeaux can be mixed with 1 gallon of water. It is recommended to spray the tree again at bud swell and bloom time, especially during damp conditions.