A leaf spot disease on common aspen leaves (Populus tremula).

A leaf spot disease on common aspen leaves (Populus tremula).
A leaf spot disease on common aspen leaves (Populus tremula).
A leaf spot disease on common aspen leaves (Populus tremula).
A leaf spot disease on common aspen leaves (Populus tremula).

A leaf spot disease on common aspen leaves (Populus tremula). -- source link


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