Place these traps around the garden and collect snails and slugs in early morning. Homemade or commercial pit traps that use beer or yeast mixtures to lure snails and slugs to a drowning death may help, but hand-picking will probably still be necessary. Many common ground beetles kill snails and slugs. Avoid killing these allies. Use Iron Phosphate Bait Choose a bait product carefully.
Baits containing methiocarb kill earthworms and beneficial insects.
Nevertheless, always keep this and all other pesticides out of the reach of children and pets. After eating iron phosphate, snails and slugs stop feeding and die within 3 to 6 days. They often crawl into secluded places, so you may not see dead bodies. Reapply iron phosphate baits every 2 weeks. Prevention Snails and slugs find large expanses of ivy, nasturtiums, and other succulent ground covers particularly attractive, and they also hide in clumps of agapanthus, lilies, daffodils, and iris.