Abstract
Studies were carried out on the identification of insects acting as natural enemies of Pseudaulacaspis pentagona TARGIONI and on their seasonal prevalence in the Tohoku district. The natural enemies identified were as follows: Aspidiotiphagus citrinus CRAW, Anabrolepis lindingaspidis TACHIKAWA, and Anicetus sp. of Hymenoptera, Chalcidoiea. These had never been recognized as parasitic natural enemies of P. pentagona. On the other hand Rodolia limbata MOTSCHULSKY, Stethorus sp. Sukunahikona japonica H. KAMIYA, Scymnus hilaris MOTSCHULSKY, Nephus phosphorus LEWIS, Serangium japonicum CHAPIN, Cybocephalus nipponicus ENDRODY-YOUNGA of Coleoptera were acting as predators. In addition two kinds of predacious natural enemies Dentifibula sp. and Lestodiplosis sp. of Diptera, Cecidomyiidae were recorded for the first time in Japan. The seasonal prevalence and abundance of parasitic wasps and predacious natural enemies in a mulberry plantation were also investigated.
