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.
The black rot fungus, Botryosphaeria obtusa, covers a wide geographical range and attacks the fruit, leaves, and bark of apple trees and other pomaceous plants. The fungus is a vigorous saprophyte and can colonize the dead tissue of many other hosts; however, its parasitic activities are confined mainly to pome fruits.