title: Contact Toxicity and Residual Efficacy of Indoxacarb against the European Earwig (Dermaptera: Forficulidae).
abstract: Indoxacarb (Arilon 20WG) was evaluated against a nuisance pest, the European earwig (Forficula auricularia), and was found to be an effective contact toxicant with residual activity on substrates commonly encountered in urban environments. Within 16 h of being directly sprayed with indoxacarb, ≥90% of earwigs from two populations were either ataxic, moribund, or dead, and 100% displayed these symptoms of severe intoxication at 1 d. Brief exposure (5 min or 1 h) to dried residues on either a porous (pine wood) or non-porous (ceramic tile) substrate also was sufficient to cause severe intoxication of earwigs within 1 d. In all bioassays, indoxacarb-treated earwigs showed no signs of recovery during the 21-d observation period. In outdoor urban habitats, intoxicated earwigs would be more vulnerable to desiccation, predation, or pathogens leading to higher mortality than in a laboratory setting.
authors.affiliation: Department of Entomology, Ohio State University, 2501 Carmack Rd., Columbus, OH 43210-1065, USA. Jones.1800@osu.edu.
authors.forename: Susan C
authors.initials: SC
authors.lastname: Jones
authors.affiliation: Department of Entomology, Ohio State University, 2501 Carmack Rd., Columbus, OH 43210-1065, USA. bryant.1310@osu.edu.
authors.forename: Joshua L
authors.initials: JL
authors.lastname: Bryant
keywords: Forficula auricularia; oxadiazine; pesticide; residual insecticide; urban environments