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Found a couple things saying the nematodes don't work on Spanish slugs or generally the big ones on the surface.
They seem to work on ours - we have (had) mostly big fat orange ones with the occasional leopard slug. We still have plenty in the wider garden but they don't seem to be at concentrations where they can destroy entire crops as they have in the past.
I don't think they do the toad (or anything else) any harm apart from denying them a food source, but each to their own.
MrSweary-
Cheers. Yeah if I was to use them it would be only on the veg patch, I would hope the slugs munching through the heaps of discarded plant matter would remain. However, they move quick, so surely they just spread out again.
the occasional leopard slug
I believe the leopards eat the other ones, so to be encouraged.
hoefla
We don't like to eat diseased things, I think the toads don't either, or it's not good for them.
Found a couple things saying the nematodes don't work on Spanish slugs or generally the big ones on the surface.
Some interesting thoughts here, including that any trap or pellet that contains an attractor just makes it worse. https://www.slughelp.com/natural-slug-control-effective-organic-non-violent/