Posted: 11/05/2012 at 20:48
Copper does work and making a fence out of it sounds a good idea - make it high and deep enough for them not to climb over (they can climb up to a overhanging leaf!) or burrow underneath.
I have frogs in my garden and also many slugs - they rarely go for slugs as they prefer juicy worms. Perhaps Toads eat slugs more often and people get confused?
Slug pellets are the best thing I have used to get rid of them, at least for a few weeks. I only find really small ones now.
A not very nice way of ctching lots of slugs is to stab a large one with a brach or stick. It leaks its stomach and that attracts loads of nearby slugs by dusk (slugs will eat other slugs and snails).