Ecological Entomology (2013) 38, 173-182

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Li-Bin Han, Ling-Qiao Huang and Chen-Zhu Wang (2013)
Host preference and suitability in the endoparasitoid Campoletis chlorideae is associated with its ability to suppress host immune responses
Ecological Entomology 38 (2), 173-182
Abstract: The endoparasitoid wasp Campoletis chlorideae Uchida attacks many noctuid species which vary in their suitability but the host association of this wasp species is poorly understood. In this study, three sympatric noctuid species were chosen, Helicoverpa armigera (Hübner), Mythimna separata (Walker), and Spodoptera exigua (Hübner), to study host preference and suitability of C. chlorideae, examining the immunological compatibility between the parasitoid and the three host species.
Campoletis chlorideae parasitised all three species, but showed a much higher preference for H. armigera and M. separata than for S. exigua. In H. armigera, the young wasps developed perfectly and none was encapsulated. In M. separata, about 50% and 10% of them were encapsulated in single and double parasitisation experiments, respectively, and the cocoons were significantly lighter than those from parasitised H. armigera and S. exigua. In S. exigua, 84.8% of the young wasps were encapsulated.
In double parasitisation experiments, the phenoloxidase activity, the number of total haemocytes, and the number of plasmatocytes and granulocytes significantly decreased in the haemolymph of H. armigera and M. separata, but not in S. exigua.
These results indicate that H. armigera is the most suitable host, M. separata is moderately suitable, whereas S. exigua is an unsuitable host for C. chlorideae. The suitability of the parasitoid to three host species was closely related with the capacity of the wasp to inhibit the host immune system.
This study sustains the optimality theory and also evidences the correlation of host-selection behaviour of the parasitoid wasp and its immunosuppressive ability.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Chen-Zhu Wang

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Helicoverpa armigera
Mythimna separata
Campoletis chlorideae (parasitoid) Helicoverpa armigera
Campoletis chlorideae (parasitoid) Mythimna separata