Holly from Boston, Ma writes
I have an old red-flowering crabapple that gets leaf fungus (black spots, then yellowing or bright orange coloring, then leaves dropping). I also have a juneberry tree that gets cedar rust. What is the best product or products to use, and what's the least toxic (realizing that these may be two different products). Thank you!
Fung-onil Multi Purpose Fungicide Concentrate is a great product for ornamental trees and shrubs for a variety of fungal diseases, including leaf spot and rust. If you plan to eat the fruit from the crabapple tree, then we would recommend Bonide Liquid Copper Fungicide. For more details on an exact recommendation for your trees, we suggest contacting an arborist or Master Gardener in your area.
Answer last updated on: 07/29/2017
