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Caterpillars are the most likely as that is the way they feed. Look for any leaves which are folded or bunched together, as caterpillars often do this (with silk) to make themselves a comfy home. You may need to inspect all of the plants and beneath the plastic top of the growbag until you find the culprits. Some types hide behind supports etc too in the daytime (tomato moth caterpillars are very good at that!)
Caterpillars usually stick to just a few types of plants, but may hide on any, so check your marigolds too. The marigolds should keep away white fly though, which is the usual reason for growing them in greenhouses. Another possibility is slugs, but they usually eat any parts of plants, not just around the edges of leaves. Personally, I'd put a sprinke of organic slug pellets in there too..
Lucy-could I suggest you go out after dark tonight with a torch and you might find the culprit having supper-a lot of these pests are nocturnal feeders,
I have holes in my aubergine plants,whats causing that?