They adore pellets which obviously attract them. I hide little piles under a tile to keep them dry and away from birds, and next morning the've all been eaten. Sure, the odd dead slug succombs, but the main army seems to be unaffected. I've wondered whether the best approach is somehow to clean the garden compost of slugs before using it? I understand they do a useful job in helping to break down organic matter. I tend to make my compost one year, turn the heap after six months or so, then spread it the following season. It doesn't get all that hot in the winter since most of what goes on then is brown stuff - wood chips, prunings, etc. I'm loath to put all my garden waste in the wheely bin, then buy it back at considerable expense once it has been processed, but this just might be a way to reduce the infestation.