University Of Tasmania

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Influence of host behavior and host size on the success of oviposition of Cotesia urabae and Dolichogenidea eucalypti (Hymenoptera: Braconidae)

journal contribution
posted on 2023-05-18, 12:42 authored by Geoff AllenGeoff Allen
Behavioral interactions among Cotesia urabae Austin and Allen, Dolichogenidea eucalypti Austin and Allen (Hymenoptera: Braconidae), and their host Uraba lugens Walker, the gum leaf skeletonizer (Lepidoptera: Noctuidae), were observed at three host sizes over a 20-min period. These sizes were first instar (small, gregarious), fourth-fifth instar (mid, gregarious), sixth-seventh instar (large, solitary) larvae. Unlike C. urabae, D. eucalypti used its legs to hold small larvae before ovipositor insertion. D. eucalyptialso visited patches of small larvae more frequently, proceeded less often through patches of mid larvae, and made significantly fewer ovipositions in mid and large larvae. Small larvae responded to both parasitoids by dispersing outward, while mid larvae responded to parasitoids by moving inward to form a denser group. Larvae reared or thrashed after each parasitoid visit, especially mid larvae, and some continued to do so for up to 2h after parasitoid departure. Mid and large larvae occasionally injured parasitoids by biting their appendages. By rearing or thrashing immediately prior to an encounter with a parasitoid, mid and large larvae decreased the likelihood of being parasitized by up to 50%.


Publication title

Journal of Insect Behavior








Tasmanian Institute of Agriculture (TIA)


Kluwer Academic/Plenum Publ

Place of publication

233 Spring St, New York, USA, Ny, 10013

Rights statement

Copyright 1990 Plenum Publishing Corporation

Repository Status

  • Restricted

Socio-economic Objectives

Control of pests, diseases and exotic species in terrestrial environments