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Factors influencing the control of the Sirex woodwasp in South Africa
Thesis (PhD)--University of Pretoria, 2010.
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University of Pretoria
2013
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| _version_ | 1867613442029912064 |
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| access_status_str | Open Access |
| author2 | Slippers, Bernard |
| author_browse | Slippers, Bernard |
| author_facet | Slippers, Bernard |
| collection | Thesis |
| dc_rights_str_mv | © 2010 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Thesis (PhD)--University of Pretoria, 2010. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/28962 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:12.613Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/28962 Factors influencing the control of the Sirex woodwasp in South Africa Slippers, Bernard bret.hurley@fabi.up.ac.za Wingfield, Michael J. Hurley, Brett Phillip Biological control Pinus plantations Woodwasp (Sirex noctilio) UCTD Thesis (PhD)--University of Pretoria, 2010. The woodwasp Sirex noctilio is one of the most serious invasive pests of Pinus plantations in the southern hemisphere. Extensive control programs have been developed to manage this pest, of which biological control has been a major component. This thesis examined the factors that could influence the control of S. noctilio in South Africa. A critical comparison of S. noctilio infestations and control efforts throughout the southern hemisphere revealed that control has not been uniformly effective, and local adaptation of control strategies is likely required as S. noctilio moves to new areas. The parasitic nematode Deladenus siricidicola is considered the primary biological control agent of S. noctilio. This nematode also feeds on the fungal symbiont of S. noctilio, Amylostereum areolatum. Possible factors influencing the success of this nematode in the summer rainfall areas of South Africa were examined. Data from a field trial revealed that moisture content of the wood influences inoculation success and this is influenced by the time of inoculation and the section of the tree inoculated. Laboratory-based assays revealed that incompatibility between the strain of A. areolatum and D. siricidicola was unlikely to be the cause of low inoculation success with the nematode, but that artificial inoculations could be affected by competition of A. areolatum with sapstain fungi. The parasitic wasp Ibalia leucospoides is another biological agent for S. noctilio. Mitochondrial and nuclear DNA sequence data reflected the extensive introduction of I. leucospoides into the southern hemisphere, followed by genetic bottlenecks that fixed only a few haplotypes in the introduced populations. Promoting awareness of S. noctilio in the forestry community has also been an important component of the control strategy. Data from a survey questionnaire showed that the awareness campaign had been generally successful, but the lack of basic knowledge to identify S. noctilio and its symptoms and the poor reach of the awareness media to some sectors of the forestry community, was of concern. This thesis has contributed towards understanding the factors that influence the control of S. noctilio in South Africa, with relevance to other regions where S. noctilio has been introduced. Zoology and Entomology Unrestricted 2013-09-07T14:33:41Z 2010-10-24 2013-09-07T14:33:41Z 2010-09-02 2010-10-24 2010-10-23 Thesis Hurley, BP 2010, Factors influencing the control of the Sirex woodwasp in South Africa , PhD thesis, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/28962 > D10/714/ag http://hdl.handle.net/2263/28962 http://upetd.up.ac.za/thesis/available/etd-10232010-133746/ © 2010 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | Biological control Pinus plantations Woodwasp (Sirex noctilio) UCTD Factors influencing the control of the Sirex woodwasp in South Africa |
| title | Factors influencing the control of the Sirex woodwasp in South Africa |
| title_full | Factors influencing the control of the Sirex woodwasp in South Africa |
| title_fullStr | Factors influencing the control of the Sirex woodwasp in South Africa |
| title_full_unstemmed | Factors influencing the control of the Sirex woodwasp in South Africa |
| title_short | Factors influencing the control of the Sirex woodwasp in South Africa |
| title_sort | factors influencing the control of the sirex woodwasp in south africa |
| topic | Biological control Pinus plantations Woodwasp (Sirex noctilio) UCTD |
| url | http://hdl.handle.net/2263/28962 http://upetd.up.ac.za/thesis/available/etd-10232010-133746/ |