Treat adults with pyrethrum. Earwigs seldom cause damage in the house, and rarely warrant chemical treatment. These are beneficial insects. No suppressive chemical treatment warranted. Spot treat areas inside where they gather with resmethrin, azadirachtin, or propoxur.
Spiders are beneficial, and non-chemical recommendations are generally sufficient.
If infestation is severe in the house, spray pyrethrum or resmethrin in moist areas in the basement, kitchen, or bathroom. Based on material revised April 1998. Lawrence K. Forcier, Director, University of Vermont Extension, Burlington, Vermont. University of Vermont Extension and U.S. Department of Agriculture, cooperating, offer education and employment to everyone without regard to race, color, national origin, sex, religion, age, disability, political beliefs, and marital or familial status.