Some common signs of tree diseases or insect infestations include:   – Wilting, discolored, or sparse foliage – Abnormal growth patterns or stunted growth – Peeling or cracked bark – Mushroom growth on the trunk or branches – Sawdust or frass (insect excrement) around the base of the tree – Holes or tunnels in the bark or branches   If you notice any of these signs, it’s crucial to have a professional arborist inspect the tree and recommend appropriate treatment options.