Donna...
geewhiz i see you have 31 views and no replies. This is very unusual and i'm not sure how this happened. I am sure there must be people out there with snail and slug problems. I am a strictly organic gardener and usually people who are not don't like to hear about my methods. I would find out when they are eating and/or just pick them up as i find them, pop them in a bag and either drown them or put them in the freezer. As your number of slugs reduces, fewer will reproduce. This requires some perseverance. I have found this true with many plant predators. Also i think snails may be attracted to beer...they will drink some and then fall in and drown. So you might try baiting with small open containers of beer. If you are not organic, you can go the traditional poison bait route but this is not good to use if you have pets. So anyway, this might bring your question back to the top where you may receive more responses