tree leaf diseases
Diseases occur on. maples in the landscape as well as those. growing in natural woodlots and forests. Anthracnose, fungal leaf spots (including tar. spot), powdery mildew, and Verticillium. wilt are diseases that are usually. encountered every year whereas leaf scorch. is an occasional problem. The species of. maple that we most frequently encounter in.
Phytophthora root rot. Identification tip: The pale green to yellowish leaves on the left tree can have several causes, including root nematodes and diseases such as Armillaria root rot and Tristeza. Shown here is Phytophthora root rot on avocado.