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.
Silver leaf is a fungus disease that causes the purple leaf plum tree's leaves to turn silver with brown at the edges. Other symptoms include branch and stem dieback and the appearance of a purple, white or brown fungus on the bark. Plum trees can develop brown rot, which is a fungus that turns the fruit brown and may herald the appearance of white fungal spores on the fruit. Plums will either shrivel on the limbs or fall of the tree.