Looks more like a disease than an insect infestation problem. Any ideas?
Looks like a fungal infection due to the damp and wet. Presumably you want it to eat/,add to Pimms,/ provide nectar for bees, /(delete as applicable)so I would just pick off infected leaves.
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Looks like a fungal infection due to the damp and wet. Presumably you want it to eat/,add to Pimms,/ provide nectar for bees, /(delete as applicable)so I would just pick off infected leaves.