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.
Control Fungus Gnats. Fungus gnats look like little mosquitoes, only they don't bite. In fact, they're so small, you may not even notice you have any unless they swarm. Fungus gnats hang out in damp soil and live off decaying organic matter.