 Chemical control such as fungicides is common, but coverage of all canopy parts is required.Fungicides that can be used include copper hydroxide, copper sulfate, copper salts of fatty and / or rosin acids, mancozeb and thiophanate-methyl.It is also recommended that the trees be sprayed with chlorothalonil at 2 1/2 pounds per 100 gallons of water in hydraulic spray equipment or 5 1/2 pounds per 100 gallons in high-pressure mist blower.