I am pretty sure it is called Septoria Leaf Spot. It is a type of fungus. Some cultivars are more suceptible than others. I would talk to your local nursery about what to do about it
Hello and welcome to Gardening Forums! Agreed that it looks like some type of fungus - probably best to remove any badly affected leaves and make sure you wash your hands to prevent any spores from spreading. You should be able to get a biofungicide from your local garden centre which is suitable for organic gardening.
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