It is reported the occurrence of the parasitoid Aprostocetus hagenowii (Ratzeburg, 1952) (Hymenoptera: Eulophidae) in oothecae of Periplaneta americana Linnaeus, 1758 (Blattodea: Blattidae) at the extreme southern Brazil. The oothecae were collected in December of 2007 at the campus of the Universidade Federal de Pelotas (31°48'34"S, 52°25'42"W), city of Capão do Leão, Rio Grande do Sul. After the collection the oothecae were placed individually in glass vials maintained in acclimatized chamber at 25°C, with relative air humidity =70% until the eclosion of the nymphs or the emergence of the parasitoids. The infested ootheca presented 89 parasitoids (79 females and 10 males). The referred occurrence represents the first report to southern Brazil. Knowing the regions of occurrence of the natural enemies of P. americana is of great importance when developing a control strategy to the populations of the blatod.
Periplaneta americana; oothecae parasitoid; biological control