Role of Diadegma semiclausum (Hymenoptera: Ichneumonidae) in controlling Plutella xylostella (Lepidoptera: Plutellidae): Cage exclusion experiments and direct observation

Wang, X. G., Duff, J., Keller, M. A., Zalucki, M. P., Liu, S. S. and Bailey, P. (2004) Role of Diadegma semiclausum (Hymenoptera: Ichneumonidae) in controlling Plutella xylostella (Lepidoptera: Plutellidae): Cage exclusion experiments and direct observation. Biocontrol Science And Technology, 14 6: 571-586. doi:10.1080/09583150410001682304


Author Wang, X. G.
Duff, J.
Keller, M. A.
Zalucki, M. P.
Liu, S. S.
Bailey, P.
Title Role of Diadegma semiclausum (Hymenoptera: Ichneumonidae) in controlling Plutella xylostella (Lepidoptera: Plutellidae): Cage exclusion experiments and direct observation
Journal name Biocontrol Science And Technology   Check publisher's open access policy
ISSN 0958-3157
Publication date 2004
Sub-type Article (original research)
DOI 10.1080/09583150410001682304
Volume 14
Issue 6
Start page 571
End page 586
Total pages 16
Editor M. Goettel
Place of publication Basingstoke
Publisher Carfax Publishing
Collection year 2004
Language eng
Subject C1
300303 Plant Protection (Pests, Diseases and Weeds)
620299 Horticultural crops not elsewhere classified
Abstract We evaluated the role of the larval parasitoid, Diadegma semiclausum Hellen (Hymenoptera: Ichneumonidae), in controlling Plutella xylostella (L.) (Lepidoptera: Plutellidae) by cage exclusion experiments and direct field observation during the winter season in southern Queensland, Australia. The cage exclusion experiment involved uncaged, open cage and closed cage treatments. A higher percentage (54-83%) of P. xylostella larvae on sentinel plants were lost in the uncaged treatment than the closed (4-9%) or open cage treatments (11-29%). Of the larvae that remained in the uncaged treatment, 72-94% were parasitized by D. semiclausum , much higher than that in the open cage treatment (8-37% in first trial, and 38-63% in second trial). Direct observations showed a significant aggregation response of the field D. semiclausum populations to high host density plants in an experimental plot and to high host density plots that were artificially set-up near to the parasitoid source fields. The degree of aggregation varied in response to habitat quality of the parasitoid source field and scales of the manipulated host patches. As a result, density-dependence in the pattern of parasitism may depend on the relative degree of aggregation of the parasitoid population at a particular scale. A high degree of aggregation seems to be necessary to generate density-dependent parasitism by D. semiclausum . Integration of the cage exclusion experiment and direct observation demonstrated the active and dominant role of this parasitoid in controlling P. xylostella in the winter season. A biologically based IPM strategy, which incorporates the use of D. semiclausum with Bt, is suggested for the management of P. xylostella in seasons or regions with a mild temperature.
Keyword Biotechnology & Applied Microbiology
Entomology
Biological Control
Foraging Behaviour
Parasitoids
Direct Observation
Diamondback Moth
Density Dependence
Bacillus-thuringiensis
Field Populations
Red Scale
Parasitoids
Aggregation
Patterns
Host
Yponomeutidae
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 03:09:18 EST