Our Yoshino cherry tree defoliated very early both this year and last year....
Our Yoshino cherry tree defoliated very early both this year and last year. There were small round holes on almost every leaf, and the leaves turned yellow, then brown, and then dropped off. This started in late July and the leaves were completely gone by mid September.
The wet spring and summer has resulted in cherry leaf spot disease causing a premature leaf drop. It will not kill the tree but can weaken it if this occurs for several seasons. The disease is preventable using fungicide cover sprays in early spring but should be repeated with frequent spring rains, this can be costly.generally the trees recoups the next season.