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1 December 2011 Evaluation of Aprostocetus hagenowii (Hymenoptera: Eulophidae) for the Control of American Cockroaches (Dictyoptera: Blattidae) in Sewers and Crevices Around Buildings
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Abstract

The objective of this study was to evaluate the potential of Aprostocetus hagenowii (Ratzeburg) (Hymenoptera: Eulophidae) to control American cockroaches, Periplaneta americana (L.) (Dictyoptera: Rlattidae), in sewer manholes and in crevices around buildings. Parasitoids were released weekly for 12 wk from laboratory parasitized heat-killed oothecae, and parasitism monitored using sentinel oothecae of American cockroaches. In addition, preference of A. hagenowii for 1– to 4-wk-old oothecae was evaluated in the laboratory. A. hagenowii females showed no preference for any ootheca age. Twenty of the 30 tested females parasitized one ootheca, whereas the other 10 parasitized two oothecae. The total progeny (males, females, and total) that emerged from a single ootheca parasitized by a female was not significantly different to the total progeny that emerged from two oothecae parasitized by a female. The number of males, females, and total progeny that emerged from the second parasitized ootheca was significantly less than the number that emerged from the first parasitized ootheca. The weekly mean sentinel oothecal parasitism rate in wall crevices was 18.1 ± 3.2% and in sewer manholes was 13.3 ± 2.0%. The mean number of released A. hagenowii females per number of parasitized sentinel oothecae recorded in crevices was 189 ± 18, whereas it was 428 ± 50 in sewers. A. hagenowii females were more effective at parasitizing sentinel oothecae placed at high and middle levels in manholes than at a low level when releases were made at the midpoint of the manhole shaft.

© 2011 Entomological Society of America
Hui-Siang Tee, Ahmad Ramli Saad, and Chow-Yang Lee "Evaluation of Aprostocetus hagenowii (Hymenoptera: Eulophidae) for the Control of American Cockroaches (Dictyoptera: Blattidae) in Sewers and Crevices Around Buildings," Journal of Economic Entomology 104(6), 2031-2038, (1 December 2011). https://doi.org/10.1603/EC11221
Received: 7 July 2011; Accepted: 1 October 2011; Published: 1 December 2011
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