The most effective way to reduce slug problems is to reduce humidity in a Garden. Metaldehyde baits can help control slugs if they are applied correctly and at the proper time. Slugs can be attracted to fermenting materials, such as beer, and trapped. Slugs are one of the most destructive and difficult pests to control. Seedlings of many vegetables and flowers are favored foods, and high populations of slugs can cause difficulties in establishing a crop.
Slugs also feed on many fruits and vegetables prior to harvest.
This preharvest feeding results in wounds that allow various fungi and bacteria to enter and spoil the crop. In addition, the slime trails produced by slugs can contaminate Garden produce. Slug injury is sometimes difficult to diagnose because slugs hide during the day. Smaller leaves may be eaten entirely, while only the edges of larger leaves may be consumed. Thick leaves often are rasped from the leaf underside.