BIOLOGY AND BEHAVIOR Earwigs are infrequent invaders of structures in Utah. Earwigs are nocturnal feeders and seek dark tight areas for daytime shelter. As a result, they invade cracks and crevices around buildings, from where they may enter living areas. Earwigs are general feeders. Occasionally, they feed on tender plant parts and they can damage flowers such as dahlias and roses. Earwigs mostly feed on small soft bodied insects such as aphids. Most problems with earwigs in homes occur during middle to late summer.
EARWIG CONTROL METHODS Reducing the amount of sheltering debris around a building’s foundation is important in limiting earwig movements into structures. Residual insecticide sprays applied around the building foundation will reduce indoor earwig populations.
Organic Solutions: Earwigs are nocturnal doing their damage during the middle of the night. They sleep during the day, usually in rotted wood. You can catch their damaging activity if you go out when it is dark. Use equal parts (quarter cup) soy sauce and vegetable oil in a small plastic container. Place in your garden if you see holes appearing in your plant leaves and no evidence of other pests under the leaves (insects, or eggs). They are attracted to the scent of the soy sauce and will slip and slide and drown in the oil. To help speed up the process, use a cool glowing light, such as the small solar lights you can get for a dollar at Walmart and place it near the plastic container.