You can buy nematodes that kill slugs, I've never tried this.
All the groundbeetles here eat slugs too, perhaps stimulating ground beetles also helps with control?
We had a nematode subscription for a few years. Hard to tell if it made any difference due to not having a control garden to compare to. We still had a lot of slugs, that I do know.
@JWestland started
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You can buy nematodes that kill slugs, I've never tried this.
All the groundbeetles here eat slugs too, perhaps stimulating ground beetles also helps with control?