Striped Earwig, Labidura riparia , Colonization of Soybean Fields and Response to Insecticides 1

Abstract
Populations of the striped earwig, Labidura riparia (Pallas), were monitored in soybean fields using pitfall traps to evaluate patterns of colonization and response to chemical insecticides. In newly established fields, earwigs were present in lower numbers than in older fields. A combined treatment of methyl-parathion and methomyl reduced numbers of L. riparia when it was applied late in the season when nymphs were present. Numbers of earwigs in fields treated early in the season were higher than those from untreated soybeans. Numbers of earwigs in plots treated with monocrotophos were less abundant than those in plots treated with methyl-parathion and methomyl.