Slugs are a problem for many gardeners, but here in Hawaii they’re an exceptional problem. Not only do they damage crops, they transmit something called rat lung disease. It’s a rare* disease and one that is still being studied, but the general consensus is that accidental ingestion of tiny slugs (ick!) is bad, as is ingesting raw produce that’s been slimed by slugs. I’ve been working on a “slug protocol” that will rid the garden of these slimy pests without the added risk of poisons.
- While it doesn’t eliminate the slugs, I start by growing my lettuce in containers – often hanging containers – to keep slugs off the salad greens we eat raw.
- I’ve started going on weekly slug hunts. (Psst! Hey, who’s the nut job out there in pajamas wearing a headlamp??) No, it’s not glamorous. In fact, it’s pretty gross. But since I’ve implemented this plan I’ve seen a huge reduction in how many slugs I catch in a night. I go out after dark with the aforementioned headlamp (PJs optional), a container with about an inch of either vinegar or salt in the bottom, and wooden chopsticks. As I spot slugs, I use the chopsticks to pick them up and drop them in the container. When I first started doing this, I’d pull 30-40 slugs out of the yard in half an hour. Now, it’s more like 10-12. Plus? Picking up slimy slugs with chopsticks is great practice for my next Chinese dining experience.
- I’ve noticed that there are certain kinds of plant debris that really attracts slugs. The pink hibiscus blossoms seen above are like a 5-star buffet to my slugs, so I’ve taken to piling them in one place and waiting for the pests to move in. I’ve had success with eggplant, too. I understand a cut potato or citrus will draw them in as well, but you’ll likely need to experiment to see what draws slugs in your garden. Once the slugs have congregated on the materials, I use the chopsticks to remove them, leaving the bait behind. If you’re more squeamish you could pick up the entire slug covered mess and toss it.
- I keep my eyes open for eggs when I’m working in the yard. If I can eliminate the slugs before they hatch, all the better. I usually find them when I’m weeding in an area with lots of debris.
- I use Worry Free Slug and Snail Bait on a limited basis, right around the perimeter of my vegetable garden. This particular bait is made of iron phosphate and is considered safe around pets and children. According to this site, “once a snail or slug eats the bait, the iron phosphate triggers changes in the pests that make them stop feeding.” Within a day or two of sprinkling the bait, I start seeing dry, dead slugs on the ground. The product I’m using comes in a cardboard box, though it looks like the company has switched to plastic. Sluggo is another iron phosphate slug bait that comes with less plastic in the packaging.
What hasn’t worked for me:
- Chickens. My girls won’t touch ’em.
- Beer. Throw a slug party and one or two might show up, but I have much more success with my slug hunting method.
- Physical barriers. I’ve yet to find anything that a slug won’t crawl over to get dinner.
*Rat lung disease is (so far) only found in Southeast Asia and the Pacific.