Yup, a pan of beer is a great slug trap. It's goss to empty in the morning though. You will probably want several pans scattered throughout your garden. Another good thing is to lay a few boards around. The slugs will crawl under them to hide during the day. You can flip the boards over and scrape the slugs off into a bucket of water.
You can also scatter crushed eggshells and coffee grounds around your seedlings after you plant them. The slugs soft bodies can't crawl over the sharp pieces.
You can also scatter crushed eggshells and coffee grounds around your seedlings after you plant them. The slugs soft bodies can't crawl over the sharp pieces.