Parsely plants affected by disease?

Sydney, Australia

Hello. Hope someone can help me identify what the below might be on the 3 parsley plants we have. What causes it and how to avoid it would be great also! We cut all the affected leaves off before, but the (blight?) problem came back. Any help appreciated. See pics below. The 3 pics are each of a different plant. Is it all the same problem? Thanks.

Thumbnail by retrogav Thumbnail by retrogav Thumbnail by retrogav

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