Some Effects of Aldrin, Chlordane, Dieldrin, and Heptachlor on the European Earwig, Forficula auricularia1

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Abstract
A study was made on the control of the European earwig, Forficula auricularia. L., using aldrin, chlordane, heptachlor, and dieldrin, under both field and greenhouse conditions. Dieldrin showed the longest residual effects. Through contact action only, a 50% kill was achieved after 524hours from a concentration of 1 pound per 100 gallons. Aldrin at a 2-pound rate and chlordane at a 4-pound rate gave a fair kill after 207hours. Heptachlor had little residual value but gave the quickest kill, showing a high rate with I-second exposure to the insecticide, and a substantial reduction in field populations within 12 hours of the applications. Dieldrin was second in the rate with which field populations were reduced. After 25 days, field populations of earwigs were reduced by 95% or more through the application, as granules, of 4 pounds of the active ingredient per acre of each of these four insecticides.

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