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.
A white and brown shelf mushroom known as artistâs conk, infects citrus trees as well as pine, fir, maple, elm, and poplar. A bright-red conk known as varnish fungus can kill landscape and fruit trees within three to five years. Susceptible trees include pine, fir, poplar, and willow, apple, cherry, peach, and citrus. The rate of decay is rapid on oak and maple trees. The conks grow up to 14 inches wide and have a varnish-like coating on the top.