Their mouths hold a horn-like rasping organ, used to scrape plant tissues off into their digestive tract. Year-round diligence is necessary to minimize the number of slugs in your yard. A balanced control program includes not only eliminating the slugs themselves, but also their food and hiding places. Place scrap boards on the soil under plants and between garden rows. Slugs seeking shelter under the boards can be collected each morning in a bucket containing soapy water.
Slugs love yeasty odors.
Take a coffee can or plastic yogurt container with a plastic snap-on lid. Cut a hole in it about a half to a third of the way up. Bury the can to the level of the hole. Pour about two inches of beer or yeasty water in the can or container. Cover to reduce evaporation and to keep out pets.