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


Allen, GR, Influence of host behavior and host size on the success of oviposition of Cotesia urabae and Dolichogenidea eucalypti (Hymenoptera: Braconidae), Journal of Insect Behavior, 3, (6) pp. 733-749. ISSN 0892-7553 (1990) [Refereed Article]

Copyright Statement

Copyright 1990 Plenum Publishing Corporation

DOI: doi:10.1007/BF01065962


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%.

Item Details

Item Type:Refereed Article
Keywords:Cotesia urabae, Dolichogenidea eucalypti, Uraba lugens, Braconidae, Noctuidae, parasitoid, gregariousness, host acceptance, host defence
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Forest health and pathology
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Control of pests, diseases and exotic species in terrestrial environments
UTAS Author:Allen, GR (Associate Professor Geoff Allen)
ID Code:102688
Year Published:1990
Web of Science® Times Cited:27
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-09-03
Last Modified:2015-10-06

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