Abstract
Experiments were conducted in Western Washington on the control of slugs affecting orchard grass-ladino white clover pastures. Slug populations for the most part consisted of Deroceras agreste (Linnaeus) and Arion ater (Linnaeus) although several other species were found. The best method of determining slug populations in pastures involved the use of boxes. It was found that slugs would seek shelter under upturned boxes during the day if the boxes were made light-proof. It was demonstrated that slugs could destroy ladino white clover in a single growing season. Slug populations varied greatly within a season. The slug Population was greatly increase at the surface by over head irrigation. When colloidal suspensions of metaldehyde were pumped into the irrigation system at this time, seasonal control of slugs was obtained.
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