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- W2054616289 abstract "We evaluated the role of the larval parasitoid, Diadegma semiclausum Hellén (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." @default.
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- W2054616289 date "2004-09-01" @default.
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- W2054616289 title "Role of<i>Diadegma semiclausum</i>(Hymenoptera: Ichneumonidae) in controlling<i>Plutella xylostella</i>(Lepidoptera: Plutellidae): Cage exclusion experiments and direct observation" @default.
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- W2054616289 doi "https://doi.org/10.1080/09583150410001682304" @default.
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