Berries leaves can be part of the life-cycle for some rust fungi! For example, hemlock-blueberry rust results in a powdery, orange rust on the undersides of blueberry & hemlock leaves. Don't worry if your patch is infected—the berries will be safe to eat.
https://www.fs.usda.gov/detailfull/r10/forest-grasslandhealth/?cid=FSEPRD684233&width=full
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