📋 Steps
1
Confirm slugs — not other chewing insects
Slug damage: irregular holes with ragged edges, concentrated on leaf margins and undersides; slime trails visible in the morning (dry in afternoon). Earwig damage: similar holes but no slime, earwigs found under debris at night. Caterpillar damage: cleaner holes, frass pellets present. Finding slime trails is the definitive confirmation.
2
Apply iron phosphate bait (Sluggo) at dusk weekly
Iron phosphate (Sluggo, Sluggo Plus) is OMRI-certified organic, completely safe for pets and wildlife, and highly effective. Scatter granules thinly around plants and garden beds at dusk — slugs are nocturnal. Iron phosphate breaks down into iron and phosphate in the soil, fertilizing plants. Reapply weekly or after rain. This is the recommended standard treatment.
3
Create copper tape barriers around raised beds
Slugs receive a mild electrical charge from copper that deters crossing. Copper tape placed around raised bed frames provides a physical barrier that complements bait programs. Ensure no vegetation bridges over the copper — slugs will use it to bypass the barrier.
4
Reduce surface moisture and hiding places
Slugs require moisture and shelter. Watering in the morning (not evening) allows soil surface to dry before nighttime slug activity. Remove boards, ground covers, and debris near garden beds where slugs shelter during the day. A clean, dry garden surface dramatically reduces slug populations even without bait.
5
Deploy nighttime patrols for persistent infestations
Go out 1-2 hours after dark with a flashlight. Slugs are fully active and easily visible. Collect in a container of salty water. This sounds tedious but can remove 50+ slugs per night during peak pressure, rapidly collapsing dense populations.
💡 Tips
- Never use salt directly on slugs in your garden — salt damages soil structure and kills beneficial organisms including earthworms
- Diatomaceous earth is not effective against slugs — it requires dry conditions to work and slugs produce mucus that renders it ineffective
- Beer traps work but require daily maintenance (emptying and refilling) — iron phosphate bait is more effective and lower maintenance
- Encourage slug predators: ground beetles, hedgehogs, toads, garter snakes, and birds all eat slugs — avoid broad-spectrum soil insecticides that kill these beneficial predators
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