Sampling. Population monitoring can be accomplished with baits and traps. Small piles of baits placed among dense vegetation can be used to monitor abundance because they often attract large numbers of earwigs. Wheat bran or oatmeal can serve as a bait. Likewise, traps take advantage of the natural tendency of earwigs to hide in crevices and dark spots, and can be used to detect presence of earwigs, and to estimate abundance.
Cultural control. On residential property or in small gardens, persistent trapping can be used to reduce earwig abundance, though this approach is challenging if the initial earwig density is high. Boards placed on the soil will be attractive to earwigs seeking shelter. Even more earwigs will accumulate if there are narrow grooves or channels in the board. Moistened, rolled-up newspaper placed in the garden in the evening and disposed of in the morning makes a convenient earwig trap for home gardens. A particularly effective technique is to fill a flower pot with wood shavings and invert the pot over a short stake that has been driven into the soil. Traps can also be placed in trees because earwigs favor convenient shelters after foraging for food during the evening.
Biological control. Several natural enemies are known, including some that were imported from Europe in an attempt to limit the destructive habits of this earwig in North America. Some authors have suggested that the most important natural enemy is the European parasitoid Bigonicheta spinipennis (Meigen) (Diptera: Tachinidae), which has been reported to parasitize 10-50% of the earwigs in British Columbia. Others, however, report low incidence of parasitism (Lamb and Wellington 1975). Another fly, Ocytata pallipes (Fallén) (Diptera: Tachinidae) also was successfully established, but causes little mortality. Under the cool, wet conditions of Oregon, Washington, and British Columbia, the fungi Erynia forficulae and Metarhizium anisopliae also infect earwigs (Crumb et al. 1941, Ben-Ze'ev 1986). The nematode Mermis nigrescens appears to be an important mortality factor in Ontario, where 10-63% of earwigs were infected during a 2-year period (Wilson 1971). However, this nematode has not been reported from earwigs elsewhere. Avian predation can be significant (Lamb 1975).
Chemical control. Residual foliar insecticides and baits containing toxicant can be used to suppress earwigs. Of numerous baits evaluated, Crumb et al. (1941) suggested that wheat bran flakes plus toxicant and a small amount of fish oil was an optimal for killing these insects. Fulton (1924) believed fish oil unnecessary but suggested addition of glycerin and molasses. Commercial products are rarely formulated specifically for earwigs because they rarely are a severe problem. Rather, products sold for grasshoppers, cutworms, slugs, and sowbugs are applied for earwig control. Bait is most effective if applied in the evening.