Answer: Cherry trees can develop fungal diseases when the spring weather is wet so some years your tree may have fungal problems and other years it may not. To protect the tree against fungal diseases you can spray the tree three times during the bloom period: suggested intervals are 'early, when you see red or pink showing on the buds'; one more spray when the tree is in full bloom, and a final spray after the petals have dropped.
Chemicals registered for home use include Daconil, Captan, and Spectracide Immunox. Check the label carefully for all instructions and be sure that cherries are listed on the label. Since the tree has edible fruit, it's necessary to find a product listing 'fruiting cherry' on the label. Best wishes with your tree!
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