Problems with Amelanchier

Islip, NY

My amelanchier has problems every year. I'm not sure what variety it is. It has been in our garden close to 40 years and is a good size for this tree. But every summer the leaves turn yellow early in the season and begin dropping. The leaves do not look like cedar apple rust or black spot to me. This year it has already started the last week of June. I have a professional arborist do preventive spraying regularly. But we have not gotten this issue under control. Does anyone have any suggestions?

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