You can use egg shells, diatomaceous earth, wood ashes, drown them
in beer, or make the midnight rounds with a flash light (torch in
your part of the world). Your best bet is to get a bait with iron
phosphate in it (iron is a necessary element for human health and
phosphate is important to the garden), or nematodes
(Google: "garden, snails, nematodes") or check a nursery near you.
I bought a small spool of thin copper wire. I wrap this three times
around certain flower pots that have plants that attract snails. I also
wrapped it around the trunk of a tangelo (citrus that is a cross between
pomelo and tangerine) in a way that allows the trunk to grow and expand
without the wire cutting into the bark. (The snails in California find
citrus bark to be a special treat. They can kill a mature tree by
eating all around the trunk and girdling the tree.)
For my garden in general, I use carnivorous decollate snails. I don't
know if decollates will prey on the snails in your area. Also,
decollates are not allowed in some areas because they might prey on
native endangered snails. See
<http://www.ipm.ucdavis.edu/PMG/r107500111.html for details about
decollates and also about ways to control the snails that destroy our
David E. Ross
Climate: California Mediterranean
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