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.
Q: I have a maple tree on which the trunk is turning black. Should I be worried? A: Art Morris, Master Arborist for Bartlett Tree Experts says he sees this quite a bit. Dark staining of maple tree trunks is most commonly an indication that the trees are infested with gloomy scale. The maple trunk gradually turns black as sooty mold accumulates on the honeydew that the scales produce. Gloomy scales often go undetected for years due to their size. Theyâre about the size of a pin head (1/16 to 1/8 of an inch) and look like very small bumps on the bark of the tree. Although they blend into the bark very well, theyâre easy to identify by gently scratching the bark with a fingernail, causing them to flake off.