Plant Problem Diagnostic
Slugs in the Garden
The short answer
Slugs chew ragged holes in leaves and leave telltale silvery slime trails, feeding mostly at night and in damp conditions. No single tactic solves a slug problem, so use an integrated approach: handpick after dark, set simple traps, and reduce the moist hiding places they need.
Handpicking at night can be very effective if done thoroughly and regularly. Boards or other cover laid on the soil become daytime traps you empty each morning, and shallow dishes of beer or yeast solution drown them. Good garden sanitation removes the shelter and moisture slugs depend on.
How to identify it
Slugs are soft, legless mollusks that rasp the surface of leaves when young and chew holes in leaves as adults, leaving shiny dried slime trails on foliage and soil. Damage appears overnight, and slugs hide by day under boards, mulch, pots, and debris.
- Ragged holes in leaves, worse after damp nights
- Silvery dried slime trails
- Feed at night, hide in damp shelter by day
- No hard shell (snails are the shelled relatives)
IPM least-toxic management
- 1Handpick at night — Handpick slugs from plants after dark on a regular schedule; done thoroughly, this is very effective.
- 2Set board traps — Lay boards or similar cover at least six inches square on the soil; each morning collect and destroy the slugs sheltering underneath.
- 3Use beer/yeast traps — Shallow dishes of beer or baker's yeast dissolved in water attract and drown slugs.
- 4Reduce moisture and shelter — Improve sanitation and remove debris and excess moisture, since slugs need damp, sheltered conditions to thrive.
When to escalate
If cultural traps and handpicking do not reduce damage on valuable plantings, baits in least-toxic categories are available. For product options consult your county Extension and always follow the label.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- University of Minnesota Extension — Slugs in home gardens — Slugs chew holes and leave slime trails, feed at night, and are managed by handpicking, board traps, beer/yeast traps, and reducing moisture and shelter.
- University of Maine Cooperative Extension — Slugs and Snails — An integrated slug program uses handpicking, board/beer traps, and sanitation to remove moisture and shelter rather than relying on one method.