Comparison of Semiochemically Mediated Interactions Involving Specialist and Generalist Brassica-feeding Aphids and the Braconid Parasitoid Diaeretiella rapae

Diaeretiella rapae, a parasitoid that predominately specializes in the parasitism of Brassica-feeding aphids, attacks Lipaphis erysimi, a specialist feeding aphid of the Brassicaceae and other families in the Capparales, at a greater rate than the generalist-feeding aphid, Myzus persicae. In this st...

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Bibliographic Details
Published in:Journal of chemical ecology 2007-04, Vol.33 (4), p.767-779
Main Authors: Blande, J. D, Pickett, J. A, Poppy, G. M
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Animals
Aphids - metabolism
Aphids - physiology
Autoecology
Biological and medical sciences
Biological control
Brassica - parasitology
Brassica rapa
Brassica rapa subsp. rapa
Brassicaceae
Capparales
Comparative studies
Control
Diaeretiella rapae
Feeding Behavior
Flowers & plants
Fundamental and applied biological sciences. Psychology
glucosinolates
herbivore-induced plant volatiles
host cues
host location
host seeking
host specificity
Host-Parasite Interactions
isothiocyanates
Lipaphis erysimi
Myzus persicae
orientation behavior
Parasites
parasitoids
Phytopathology. Animal pests. Plant and forest protection
Protozoa. Invertebrata
Protozoa. Invertebrates
semiochemicals
Species Specificity
tritrophic interactions
turnips
volatile compounds
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Summary:Diaeretiella rapae, a parasitoid that predominately specializes in the parasitism of Brassica-feeding aphids, attacks Lipaphis erysimi, a specialist feeding aphid of the Brassicaceae and other families in the Capparales, at a greater rate than the generalist-feeding aphid, Myzus persicae. In this study, we investigated the orientation behavior of D. rapae to the volatile chemicals produced when these two aphid species feed on turnip (Brassica rapa var rapifera). We showed no significant preference orientation behavior to either aphid/turnip complex over the other. Isothiocyanates are among the compounds emitted by plants of the Brassicaceae in response to insect feeding damage, including by aphids. We assessed parasitoid orientation behavior in response to laboratory-formulated isothiocyanates. We tested two formulations and discovered significant orientation toward 3-butenyl isothiocyanate. We also assessed plant and aphid glucosinolate content, and showed large levels of glucosinolate concentration in L. erysimi, whereas there was little change in plant content in response to aphid feeding. Our results suggest that during the process of host location, similar cues may be utilized for locating L. erysimi and M. persicae, whereas the acceptance of hosts and their suitability may involve aspects of nonvolatile aphid chemistry.
ISSN:0098-0331
1573-1561
DOI:10.1007/s10886-007-9264-7