Posted: 10/05/2013 at 13:16
If anyone could answer that one positively they could spend the rest of their life sitting on a money mountain - the long and the short of it is that you can't, you can reduce them and learn to use things they don't like, and then learn to live with the remainder.
I have found that grit, egg shells etc. do not help at all here, nor do most of the barrier methods, and believe me I have tried them all. I gow around 65 hostas in pots, so you can imagine the battles we have. The only 2 things I have found useful are copper collars on the pots, they will not cross those, and the iron based slug pellets which do no harm to other wild life - I would not use the other ones. I hear that beer traps work well, btu cold notbring mysef to empty them!!
Nematodes do work very well indeed, but are expensive, very hard work to apply, last a short time only and once your slugs have gone, as nature abhores a vaccuum all the neighbours slugs move in later on!! Encourage lots of things that eat slugs, especially the huge horrible ones, as they do your plants no harm at all, although they look revolting, but they live on the small slugs which do damage your plants to death. Lots of birds of course, and if you are lucky, a hedgehog or two.