|For some time now, I have noticed a white powdery substance on the leaves of my Royal red maple. The leaves are starting to drop off and I am wondering if I should disregard this problem hoping that next year this problem will disappear. Louisa|
|A powdery white substance on foliage almost always means a fungal disease called powdery mildew. Be sure to rake up all the fallen leaves; next spring, just before the leaves unfurl, spray your tree with a preventative bordeaux (lime-sulfur). This is the same product used to protect apple trees from fungal diseases. Spray as the leaf buds begin to swell and it should protect your tree from further attacks.|
Best wishes with your landscape!