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Selective host-feeding on parasitized hosts by the parasitoid Itoplectis naranyae (Hymenoptera: Ichneumonidae) and its implication for biological control

Published online by Cambridge University Press:  10 July 2009

T. Ueno
T. Ueno*
Affiliation:
Paddy Crop Insect-Pest Laboratory, National Agriculture Research Center, Japan
*
*Institute of Biological Control, Faculty of Agriculture, Kyushu University, Fukuoka 812-8581, Japan. Fax: + 8 1-92-642-3040 E-mail: ueno@kintaro.grt.kyushu-u.ac.jp
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Abstract

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.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 88 , Issue 4 , August 1998 , pp. 461 - 466
Copyright
Copyright © Cambridge University Press 1998

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