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Determining appropriate parameters for optimization of biocontrol success
Thesis (PhD)--University of Pretoria, 2013.
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| Format: | Thesis |
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University of Pretoria
2013
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| _version_ | 1867613465578831872 |
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| access_status_str | Open Access |
| author2 | Korsten, Lise |
| author_browse | Korsten, Lise |
| author_facet | Korsten, Lise |
| collection | Thesis |
| dc_rights_str_mv | © 2013 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, 2013. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/30784 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:36:34.949Z |
| 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:2263/30784 Determining appropriate parameters for optimization of biocontrol success Korsten, Lise Van Eeden, Madel UCTD Thesis (PhD)--University of Pretoria, 2013. Increased economic and environmental pressures have led to the requirement for a more accurate and safe crop protection method. Although Avogreen® (Bacillus subtilis) offers an environmental friendly alternative to the use of pesticides; few growers have opted for this approach mainly due to uncertainty regarding the success of the biocontrol program. Biocontrol success may be influenced by biological, ecological, scientific, economic, political, social, legal and marketing factors. Investigations showed that delivery of the antagonist to the plant surface was equally effective employing a mistblower application method and a handgun application method. On the leaf, the leaf carrying capacity influenced survival of the antagonist and the optimal application concentration of Avogreen®. Increased application frequency and a pre- harvest spray showed potential to increase biological control efficiency. Foliar fertilizers and oils enhanced antagonist counts, while spreaders, stickers and copper containing fungicides inhibited antagonist growth. Social factors that influenced farmer acceptability towards biological control programs included educational level, land owner status, generation of farming, land claim status and food safety system certification. Marketing hurdles facing the South African avocado industry included frustrations with the registration procedure of new products in South Africa and a lack of biocontrol knowledge demonstrated by sales staff. Two disease assessment methods were also evaluated. The conventional assessment method involving a rating scale was compared to a disease incidence and severity assessment method. The disease incidence and severity assessment method allowed a more detailed assessment of disease control effectiveness. To evaluate the overall success of the biocontrol program a Biocontrol Assessment Scheme (BAS) was also developed. BAS identified orchard management, antagonist application practices and technical knowledge and assistance during marketing as potential restrictions for successful biocontrol. Microbiology and Plant Pathology Unrestricted 2013-09-09T07:31:33Z 2013-05-20 2013-09-09T07:31:33Z 2013-04-12 2013-05-20 2013-05-01 Thesis Van Eeden, M 2013, Determining appropriate parameters for optimization of biocontrol success, PhD thesis, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-05012013-085929/ > D13/4/495/ag http://hdl.handle.net/2263/30784 http://upetd.up.ac.za/thesis/available/etd-05012013-085929/ © 2013 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 University of Pretoria |
| spellingShingle | UCTD Determining appropriate parameters for optimization of biocontrol success |
| title | Determining appropriate parameters for optimization of biocontrol success |
| title_full | Determining appropriate parameters for optimization of biocontrol success |
| title_fullStr | Determining appropriate parameters for optimization of biocontrol success |
| title_full_unstemmed | Determining appropriate parameters for optimization of biocontrol success |
| title_short | Determining appropriate parameters for optimization of biocontrol success |
| title_sort | determining appropriate parameters for optimization of biocontrol success |
| topic | UCTD |
| url | http://hdl.handle.net/2263/30784 http://upetd.up.ac.za/thesis/available/etd-05012013-085929/ |