CSU Extension Slugs are one of the most destructive and difficult pests to control in Colorado gardens. 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 feeding wounds that allow various rotting fungi and bacteria to enter and spoil the crop. In addition, the slime trails produced by slugs can contaminate garden produce. Injury by slugs is sometimes difficult to diagnose since 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.