T'Mater
It's really hard to tell much from the pictures because the details are quite blurry. Though I have a few questions.
1. Are the symptoms only on a few leaves, or quite a lot of them?
2. Is there anything powdery or unusual on the leaves, especially underneath.
3. Are you sure you don't have any pests like leaf-miners, thrips, spider mites, aphids etc.?
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