Symptom	Plausible Causes	Suggested Treatment
Abnormal color of bark	Environment or Disease Crown and collar rot, fireblight; sunscald
Chewed bark	Pests Gophers, rabbits, squirrels, voles
Damaged tree base	Human Causes Mechanical injury (lawn mower, weed trimmer)
Holes in bark, an or sawdust around the holes or at base of tree	Environment or Disease Dutch elm disease (Holes are caused by the beetle that carries the disease) Pests Borers
Mushrooms on tree crown	Environment or Disease Oak root fungus
Small brown or gray bumps
Splitting bark	Environment or Disease Cold lightning or sunscald
White growth on tree base	Environment or Disease Oak root fungus