Crimson Maple Tree Problem

Question

Have a crimson maple tree with leaves covered in a white residue top and bottom. Is it possible that this is white powdery mildew? If so, how do you treat an entire tree? If not, what else could it be? The tree is approximately 50 years old and is in full sun.

Answer 1

Yes, this sounds like powdery mildew. Neem oil is oftentimes effective. Here is more information: https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm