Variations in Insecticide Susceptibility of the Predatory Mite, Amblyseius womersleyi SCHICHA (Acarina: Phytoseiidae), in the Tea Fields of Japan

Open Access
Publisher Website
Google Scholar
Abstract
Insecticide susceptibility of the predatory mite Amblyseius womersleyi SHICHA in tea fields was studied using three types of pesticides: organophosphate, carbamate and some synthetic pyrethroids. Of the 20 populations tested, the Hiranuma-1 and the Ide-1 populations collected from eastern Shizuoka Prefecture were resistant to methidathion, methomyl and permethrin (W.P. formulation). The Hiranuma-1 population also showed survival of cypermethrin, and fluvalinate. Mortality of this population differed between two types of permethrin formulation. Emulsifiable concentrations of permethrin were more toxic than wettable powder formulation.