caa a22 4500 388035552 CHVBK 20180307125003.0 cr unu---uuuuu 161130e199808 xx s 000 0 eng 10.1017/S0007485300042206 doi S0007485300042206 pii (NATIONALLICENCE)cambridge-10.1017/S0007485300042206 Ueno T. Paddy Crop Insect-Pest Laboratory, National Agriculture Research Center, Japan Selective host-feeding on parasitized hosts by the parasitoid Itoplectis naranyae (Hymenoptera: Ichneumonidae) and its implication for biological control [Elektronische Daten] [T. Ueno] Host-feeding by parasitoid wasps has been viewed as a positive attribute for biological control, because hosts are killed as a result of host-feeding in addition to parasitism. Host acceptance and host-feeding responses o unparasitized vs. conspecifically parasitized hosts by the parasitoid wasp Itoplectis naranyae Ashmead were studied in the laboratory. Female I. naranyae selected to oviposit in unparasitized hosts and those that had been parasitized I h previously, in equal proportions, even when allowed access to both types of host. Females also fed upon both types of host equally. Females, however, avoided ovipositing in hosts parasitized 40 h and 70 h previously, and preferentially fed upon them when allowed access both to parasitized and to unparasitized hosts. Parasitoid progeny in hosts which had been used for host-feeding suffered a high degree of mortality. Females used host internal changes as cues for deciding whether to feed on hosts. It is suggested that immature parasitoid mortality can be increased due to female preference for using parasitized hosts for host-feeding. Hence, host-feeding by I. naranyae may not be an advantageous biological control characteristic. The adaptive significance of selective host-feeding is also discussed. Copyright © Cambridge University Press 1998 Bulletin of Entomological Research Cambridge University Press 88/4(1998-08), 461-466 0007-4853 88:4<461 1998 88 BER https://doi.org/10.1017/S0007485300042206 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0007485300042206 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Ueno T. Paddy Crop Insect-Pest Laboratory, National Agriculture Research Center, Japan NATIONALLICENCE 773 0- Bulletin of Entomological Research Cambridge University Press 88/4(1998-08), 461-466 0007-4853 88:4<461 1998 88 BER CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge