Robert from Mivonia, Mi writes
cherries show signs every year of brown rot. Need to know if this chemical will work and how frequently to apply.
Liquid Copper Fungicide is not labeled to treat brown rot on cherry trees, and we do not see recommendations of using this active ingredient for this disease. We would recommend instead to use Bonide Citrus, Fruit, and Nut Orchard Spray Concentrate.This Extension article has great information about treating and preventing this disease.
Answer last updated on: 04/23/2018