Cut several 1-inch square openings in the sides of a clean covered cottage cheese container or margarine tub. Sink the container into the soil so the openings are just above the soil surface.
Remove the lid and pour in 1/2-inch of beer, or whip up a yeast mixture:
2 tablespoons flour
1/2 teaspoon baker's yeast
1 teaspoon sugar
2 cups warm water
Replace the lid.
Slugs will be attracted to the trap, fall in and drown. Empty the container every few days and refill.