Lettuce: Slugs

• Categories: Lettuce Lettuce Insects Vegetables
• Last review date: 2026-07-31 02:08

Biology

Slugs are common garden pests in western Washington. They resemble snails, but lack shells. They may vary from as little as 1⁄4″ up to several inches in length, depending on age and species. Slugs often leave behind a characteristic slime trail, which appears silvery when it dries.

Slugs typically feed at night and do more damage during cool, moist weather. Seedlings and small plants may be completely eaten, while larger plants may show only holes in the leaves.

Management Options

See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.

Non-chemical Management

Select non-chemical management options as your first choice!

• Clean up weeds and debris which may provide shelter. Cut tall weeds and grasses around the garden and clean up rocks, boards, and other shelters.
• Encourage predators such as birds, garter snakes, frogs, ducks, and predaceous ground beetles. Avoid use of broad-spectrum insecticides which kill beneficial insects.
• Hand-pick and kill slugs when noticed.
• Use chemical baits with caution, as pets can be poisoned. Iron phosphate-based baits are safer for pets!

Chemical Management

• Apply bait in evening or at night as these pests feed mainly at night.
• Be careful not to expose baits to pets or other animals.

Approved Pesticides

If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.

• Escar-Go! Slug and Snail Bait
  Active ingredient: iron phosphate
  EPA registration number: 67702-3-56872
• Monterey Sluggo [Organic].
  Active ingredient: iron phosphate
  EPA registration number: 67702-3-54705
• This list may not include all products registered for this use.