Slice them in half, pierce them, sprinkle them with salt, or scrape them into a bucket of soapy water. Barriers and traps Copper strips. When a slug touches copper, it is charged with current, an unpleasant experience that makes it reverse course. Or form copper wire into a tight, conical spiral around each plant, with the small end at the bottom, and push the wire into the soil. Make sure slugs are not trapped inside barriers.
Slugs seek shelter during daylight.
Place small, flat boards under plants and between garden rows. Remove slugs each morning and scrape them into a bucket of soapy water. Slugs are attracted to yeasty odors. Bury the container so the hole is just above ground. Remove dead slugs daily.