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Fact Sheets - Earwigs

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Pest Management Fact Sheet #5017

Earwigs

James F. Dill, Pest Management Specialist
Clay A. Kirby, Insect Diagnostician

For information about UMaine Extension programs and resources, visit extension.umaine.edu.
Find more of our publications and books at extensionpubs.umext.maine.edu.

Description & Biology

Earwigs are spread primarily by transportation of products. Thus, items purchased at yard sales should be checked, as should cardboard boxes in damp outside areas. It is possible that most areas around homes are likely to be infested with earwigs. While it is unlikely that they can ever be completely eliminated, you can keep populations at acceptable levels.

Earwigs are reddish brown and up to 3/4 inch long when fully grown. Earwigs have a pair of forcep-like pincers extending from the back end. The pincers are used for defense and also to catch the insects on which earwigs sometimes feed.

Young earwigs resemble adults but are smaller. The female mothers her eggs and young until they are big enough to wander away from the nest and obtain their own food. Usually, earwigs are first noticed in the spring around the outside of the home near the foundation. A certain percentage of adults and eggs last through the winter.

Earwigs are noted for the damage they do to flowers, other ornamentals and vegetables. Their feeding gives leaves a ragged appearance. Corn silk is a favorite food which is often consumed as it grows. This prevents pollination and causes poorly developed ears with many kernels missing on the cobs. As populations increase and spread, the areas in which they hide become more unusual. For example, they may be found on a roof under shingles, under siding, or under items hanging on walls as well as the usual hiding places mentioned above. Because earwigs also feed on decomposing organic matter, compost and mulch may provide food and shelter.

Earwigs are nocturnal, actively feeding during the night and hiding during the day. As morning approaches, they search for a place to hide, preferably a dark, damp area underneath rubbish, boards, wood piles, near plants, rock borders or even in a home. Generally, they do not actively infest homes, but as they go up the foundations, any open area around the sill, door or window that will allow them to enter becomes an invitation to move in. They are not known to cause any damage to homes or their contents, but they are a nuisance, especially when they turn up in unusual places.

Management

A. Sanitation is most important. Avoid providing earwigs with ideal nesting and hiding places, that is any place an earwig could hide in, under or between.

Removing these hiding places is a continuous job, but the most important time to discourage is spring when plants are not yet sprouted and most outdoor items can be moved. Any items left outdoors overnight; for example: laundry, lawn furniture, flowers, or vegetables– should be checked for earwigs before they are brought into the home.

B. Traps made from two pieces of grooved wood placed together and leaned against a tree or the foundation, or 18 inch lengths of old garden hose cut at a slant to allow greater exposure of the opening and laid in the area where earwigs are present, trap many earwigs at night. Placing boards or other items on the ground, giving the insects a hiding place, also makes an effective trap. A rolled up, moistened newspaper also functions as a good trap. Shaking the earwigs out of the traps or hose into a pail with a small amount of hot soapy water ends the pests’ travels.

C. Bifenthrin, permethrin, propoxur and resmethrin can be used to control earwigs outside by spreading (according to label directions the insecticide in a 10-foot band around the home. Include the foundation, especially by basement doors and windows, where the sill of the house rests on the foundation, and where the siding starts. Sprinkle enough water on the sprayed ground to wash the insecticide off the plants and onto the soil (but not into the soil), where the earwigs will have the greatest exposure to the insecticide. Insecticide labels will tell you on what garden plants they can be used and how to mix them.

Boric acid, bifenthrin, permethrin, propxur (Baygon), resmethrin, or tetramethrin may be used to control earwigs inside the home. Use only household formulations of insecticides and only for cracks and crevices.

There is no need to do more. In fact, if earwigs are controlled outside, it is quite unlikely that inside control will be necessary, other than using a fly swatter, rolled newspaper, or vacuum cleaner to kill or clean up strays.


When Using Pesticides

ALWAYS FOLLOW LABEL DIRECTIONS!

Pest Management Office
491 College Avenue, Orono, ME 04473-1295
1-800-287-0279 (in Maine)


Information in this publication is provided purely for educational purposes. No responsibility is assumed for any problems associated with the use of products or services mentioned. No endorsement of products or companies is intended, nor is criticism of unnamed products or companies implied.

© 2009
Published and distributed in furtherance of Acts of Congress of May 8 and June 30, 1914, by the University of Maine Cooperative Extension, the Land Grant University of the state of Maine and the U.S. Department of Agriculture cooperating. Cooperative Extension and other agencies of the U.S.D.A. provide equal opportunities in programs and employment.

Call 800-287-0274 or TDD 800-287-8957 (in Maine), or 207-581-3188, for information on publications and program offerings from University of Maine Cooperative Extension, or visit extension.umaine.edu.


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