Seasonal incidence and biological control potential of Aprostocetus hagenowii (Hymenoptera: Eulophidae) in treehole microhabitats
1998
Suiter, D.R. | Patterson, R.S. | Koehler, P.G.
The development of Aprostocetus hagenowii (Ratzeburg) in irradiated 2-wk-old Periplaneta americana (L.) oothecae yielded a significantly higher percentage of female-biased clutches than freeze-killed oothecae, but per clutch the number of females and males, sex ratio, and developmental time were not significantly different. In parasitoid development studies, ootheca age and the factor clutch significantly affected the number of female and male parasitoids per clutch; younger oothecae yielded more parasitoids than older oothecae. Weekly for 30 wk, parasitoids were released in blattid-infested treeholes. Parasitism of sentinel oothecae at release sites was higher than at control sites each week after the release program was initiated. From April to November, parasitism of sentinel oothecae in control treeholes was 10-40% but peaked at 46% the week of 7 July. Weekly winter (December through March) sentinel ootheca parasitism was <10%. Parasitism of sentinel oothecae in release treeholes remained higher for 10 of the 11 wk after parasitoid releases were terminated, indicating that naturally occurring oothecae, parasitized during the release program, served as inoculum for subsequent generations of parasitoids.
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