According to a study published in 2003 from University of Newcastle-Upon-Tyne, slugs and snails die after eating garlic-based products. Researchers see potential for the use of garlic as a slug-killing agent.
Concentrated Garlic Product
The commercial slug-control product ECOguard uses garlic as the active ingredient. You can make your own non-toxic homemade garlic slug-control spray. Combine crushed garlic cloves, garlic powder and water in a spray bottle and mist the plants you need protected with it. Slugs will consume the garlic and die shortly afterward.
Slugs that consume or crawl through garlic slug products die quickly, although scientists such as the lead researcher on alternative pesticides at Newcastle University, Dr Gordon Port, aren't sure why. These compounds also kill slug eggs that are often hidden in the leaf litter and compost of your garden. Garlic slug-killing products are sprays applied onto and around your prized plants.
Compare Slug Baits
Garlic-based slug baits won't harm your plants or animals in your yard and have no lasting effect on the environment. Other commonly used main ingredients in slug killers include iron phosphate and the highly toxic metaldehyde.