Things You'll Need
Small flat box
Hole punch or large nail
Earwigs must come in contact with the dust in order for it to kill them. It may take up to a week for them to die. Dust a light coating of boric acid in areas around cracks and baseboards, where earwigs will be forced to travel through the dust.
If you are using boric acid inside, make sure you purchase a formulation meant for indoor use.
Earwigs got their name from the superstition that they crawl into a person's ear and eat their brain. While this is certainly an old wives' tale, large infestations of earwigs can harm plants. They seldom cause enough damage to be worth eradicating in small numbers. Earwigs are insects with large pinchers on their abdomen. They can use them for defense by curling the pinchers over their back. Boric acid can be used to kill them both indoors and outdoors.
Punch several holes in the sides of a small, flat box using a hole punch. You can punch the holes using a large nail if the box material is too thick for a hole punch. These are the holes the earwigs will enter through, so make them close to the bottom edge of the box.
Add about a tablespoon of dry oatmeal to the bottom of the box.
Sprinkle a light dusting of boric acid over the oatmeal.
Put the lid on the box, and place the box on the ground near locations where earwigs have been spotted.
Cover the box with a board to keep it from getting wet.
Mandy Slake has been writing since 2000. She authors technical documentation for the wireless and software industry. Slake studied computer science at Highline Community College in Midway, Wash. She has over nine years of experience in the cellular and computer industries.