Blueberry problem I.D

Does anyone know what is causing this issue on my blueberry plants? I have 12 plants and 2 of them (same variety Berkeley) exhibit this problem in the beginning of the growing season, it is seems to be getting worse.

Thanks for your help!

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That could be a fungal problem.Maybe Anthracnose,Septoria,Alternaria Leaf Spot or Blueberry Leaf Rust.

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