Interactions between adults of some species of Netelia Gray (Hymenoptera: Ichneumonidae: Tryphoninae) and their caterpillar hosts (Lepidoptera) - NMS Research Repository
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Journal article

Interactions between adults of some species of Netelia Gray (Hymenoptera: Ichneumonidae: Tryphoninae) and their caterpillar hosts (Lepidoptera)

2001

Abstract

Five species from three subgenera of Netelia were observed ovipositing on their hosts under laboratory conditions. Two species of the subgenus Bessobates oviposited without a separate insertion of the ovipositor beforehand. One species of the subgenus Netelia and two of the sub- genus Paropheltes employed a venom causing weak (often incomplete) temporary paralysis, ad- ministered as a separate action prior to oviposition. The venoms had no long-term adverse effect on hosts and it appears that these taxa, and perhaps all other groups of ectoparasitic koinobiont Ichneumonidae, lack the host-regulating venom systems that have been regarded as instrumental in the evolution of endoparasitism in some koinobiont cyclostome Braconidae. In all species sub- stantial parasitoid development was delayed until the final instar host had constructed its pu- pation site, wherein it was overwhelmed as a prepupa. Species of all three subgenera dumped eggs in the absence of hosts, and (if kept humid) such eggs subsequently split to reveal a living first instar larva (but not investigated in the subgenus Paropheltes). Species of all three subgenera indulged in non-destructive concurrent host-feeding, despite being supplied with honey solution ad libitum, making the necessary wounds on the host's body with their mandibles. Occasionally non-destructive host-feeding occurred on hosts that were not also being parasitised.

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