How to Make an Earwig Trap for Your Vegetable Garden

Caption

DYI earwig oil trap that works!

Photo Credit
Robin Sweetser
Subhead

Testing out Earwig Trap Ideas

Robin Sweetser

Why are you seeing a container of oil? Unfortunately, while it's been a banner year for my flowers, it has also been a banner year for earwigs in the vegetable garden. Find out what earwig damage looks like and how to make an earwig trap at home. I tested five earwig trap ideas to figure out worked best!

You know those crawly critters with the pinchers on their tail end. If their looks aren't enough to creep you out then the old wives' tale about them crawling into your ear at night and burrowing into your brain should do it. Of course none of that is true! Darn those old wives! Earwigs are a common garden inhabitant and it seems like everything in the garden that I disturb or move, even just a little bit, usually has a few hiding under it.

earwig-560780_1920_full_width.jpg

Photo: This is a male earwing. They have the curved pinchers while the female's are straighter.

Another Garden Mystery Solved

It took me a while to put 2 and 2 together and come up with earwigs as the problem when my rutabagas were under attack.

earwig_trap_005_full_width.jpg

Every day more and more of the leaves were being eaten until they looked like tattered rags. Normally I would blame a caterpillar but since we grow most of the brassicas under a shade cloth tunnel to keep moths from laying eggs on them I had to rule that out.

earwig_trap_007_full_width.jpg

This shade cloth tunnel has successfully thwarted many a cabbage moth from laying eggs on our brassicas.

Plus there weren't any caterpillars to be found or their tell-tale droppings. Slugs were my second guess but it has been a dry year and I haven't seen many slugs. Also there was no trace of the slime trail they leave behind. The damage is limited to just the rutabagas, even though they are planted next to broccoli and cabbage plants, those have not been touched at all. A puzzle. Then when harvesting bok choy from another part of the garden I noticed that those plants had similar damage.

earwig_trap_017_full_width.jpg

The leaves on the last of the bok choy were ravaged by the earwigs and they left behind lots of droppings on the stems. It must have been quite a party!

When I shook them upside down after cutting them, several earwigs fell out. Aha! We have seen them in the past mostly on the dahlias and zinnia flowers but I was under the impression that they were actually beneficial in the garden. They are known to eat aphids and insect larvae but feed mostly on decaying plant matter.

Then I learned that the nymphs are the ones that do the most damage, eating holes in leaves of young plants while the adults are the ones eating the flowers. The teen-age nymphs look very like the adults but their shells are softer and not as dark.

Both the adults and the nymphs feed at night, doing their dining under the cover of darkness and sleeping it off in a moist shady spot during the day. I decided to try and eradicate them from the rutabagas by trapping them. After searching thru several books and websites, I found 5 traps to try:

Testing Five Earwig Traps

earwig_trap_006_full_width.jpg

Notice the holes around the rim of the container. Maybe I should have punched more of them?

  • Trap #1 had me punch holes near the rim of a small plastic container, add some oil and a bit of soy sauce. Then I replaced the lid and buried the container with the holes level with the top of the soil. All it caught were ants—loads of tiny ants. Drawn by the promise of Chinese food I guess.

earwig_trap_012_full_width.jpg

This trap was simple enough to make and did bag one earwig.

  • Trap #2 was a toilet paper tube stuffed with straw placed among the plants under attack. A bit more successful. It caught 1 earwig.  

earwig_trap_014_full_width.jpg

One culprit caught. How many hundreds more to go?

  • Trap #3 was a can with leftover beer in it. (Honestly, who ever has leftover beer?) I thought at least it would catch a slug or two but it caught nothing, as slug do love beer. They probably didn't like the cheap brand I bought.

earwig_trap_019_full_width.jpg

No luck with this trap. Maybe they prefer the sports page.

  • Trap #4 was crumpled damp newspaper stuffed into a flowerpot. I hung the flowerpot upside-down next to the rutabagas and again caught nothing. Maybe they had already read the comics from that day's paper. 

earwig_trap_015_full_width.jpg

Any fishy-smelling oil will do - tuna, sardines, or my favorite - smoked oysters.

  • Trap # 5 was the "oil trap" which simply a small container baited with fishy-smelling oil in it. That was the most successful trap. It caught about a dozen earwigs in one night! 

You could also bait with canola oil. Some folks add bacon grease or hamburger fat as, apparently earwigs love greasy, oily stuff. But I didn't have anything like that in the house. Plus, this could attract larger critters including raccoons and skunks so if your garden is not fenced to keep them out you might not want to risk it.

Another idea to test is to cover the container with a lid, with an entry hole cut in the lid, and then empty and refill every week or so. That way you only catch earwigs (no other insect is interested in the oil trap).

I assume that the heavy amount of mulch we use in the garden is contributing to the rise in the earwig population. Next spring I might wait and use a straw mulch later in the season after the nymphs have matured. The earwigs have stopped feeding and my rutabagas seem to be recovering. Next year I will try to be more observant and take action sooner if the plants are under attack again because I do love my rutabagas!

See the Almanac's article for more information on how to identify, prevent, and get rid of earwigs.

Almanac Garden Planner

The #1 Garden Planner on Earth Just Got Better

Newly designed to be easier and faster! Grow your future with a well-planned garden!
Learn More

Comments

Jerry (not verified)

4 months 2 weeks ago

In my garden the earwigs love to spend their days sleeping in the upper parts of milkweed plants and it's very easy to knock them off into a coffee can of water, the same way I do with Japanese beetles. They like to hide in the newest leaves that are still somewhat vertical and tucked against the stem.

Rose (not verified)

4 months 2 weeks ago

I tried the can with oil method - I used a tuna can and olive oil - and the next morning a whole colony of ants had committed suicide in my oil can bath. But not a single earwig.

Ann (not verified)

4 months 2 weeks ago

Thank you for your article. It helps readers identify ear wig damage in the garden and gives practical advice on how to get rid of them. Terrific!

ROSE FORBY (not verified)

4 months 2 weeks ago

Raccoons will climb a fence. I watched them climbing my 6 ft. fence a few times. Thanks for the tips.

Paul (not verified)

4 months 2 weeks ago

I sat there saying yep, yep, me too. Same oyster tin, too, and also a million ants and no earwigs. I changed tactics. I use the flat plastic hummus containers with success. Fill 1/4” to 3/8” of oil. I used canola because it’s the cheapest I could find. I had saved the oyster oil and put a little in each of 6 containers. I put them in 6 large planters that have peppers. Just on top of or even with the mulch. Caught earwigs. I use pine cones in the planters for mulch. One thing I found was I have to soak them in soap and water as that’s where they like to hang out. I didn’t know that until I picked a bunch of cones and put them in a bag. When I got home the bag was full of earwigs. If I can figure out I’ll send pictures.