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Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa
Thesis (PhD)--University of Pretoria, 2014.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2021
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| _version_ | 1867613575668826112 |
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| access_status_str | Open Access |
| author2 | Rohwer, Egmont Richard |
| author_browse | Rohwer, Egmont Richard |
| author_facet | Rohwer, Egmont Richard |
| collection | Thesis |
| dc_rights_str_mv | © 2019 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, 2014. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/78160 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:38:19.968Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2021 |
| publishDateRange | 2021 |
| publishDateSort | 2021 |
| 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:2263/78160 Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa Rohwer, Egmont Richard Wingfield, Michael J. Slippers, Bernard marc.c.bouwer@gmail.com Bouwer, Marc Clement UCTD Thesis (PhD)--University of Pretoria, 2014. The chemical ecology for key insect pests in South Africa's commercial Pinus and Eucalyptus plantations are explored in this thesis. The main aim was to discover and characterize semiochemical compounds that explain certain behaviours of the insects involved, and that could potentially be exploited in future for the manipulation of the insects' behaviour. Such formulations are sought after because they can be applied in environmentally friendly pest management techniques. Semiochemical interactions were studied in four di erent biological systems. These included the sex pheromone communication system for the Cossid moth, Coryphodema tristis; allelochemical interactions between the Eucalyptus weevil Gonipterus spp. and their Eucalyptus host; allelochemical interactions between Sirex noctilio's, symbiotic fungus, Amylostereum areolatum and its biological control agent Ibalia leucospoides; and allelochemical interactions between the egg clutches of Thaumastocoris peregrinus and its biological control agent Cleurocoides noackae. Semiochemical compounds were found and identi ed through analysis techniques that included gas chromatography coupled to electroantennography (GCEAD) and gas chromatography coupled to mass spectrometry (GC-MS). Some of these semiochemical interactions were complex involving combinations of di erent chemical cues, such as the host recognition cues identi ed for Gonipterus species and potential cues between T. peregrinus females and their egg clutches. Other speci c interactions were found to be simpler and relied on a few speci c chemicals. These included the sex pheromone communication between C. tristis adults and the interaction occurring between female I. leucospoides wasps and the mutualistic fungus of their prey, namely A. areolatum. Biological activity was investigated only for compounds with con rmed identity and included the sex pheromones of C. tristis and some of the chemicals identi ed from the egg clusters of T. peregrinus. These tests were conducted in laboratory and eld conditions. Biological activity was proven for the identi ed sex pheromone of C. tristis during eld trials conducted in 2011 and 2013. One of the chapters was published and another submitted for publication in a peer reviewed journal. Two provisional patents were also registered from this work. Chemistry PhD Unrestricted 2021-01-28T11:42:43Z 2021-01-28T11:42:43Z 2015 2014 Thesis Bouwer, MC 2014, Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa, PhD Thesis, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/78160> A2015 http://hdl.handle.net/2263/78160 en © 2019 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 Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa |
| title | Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa |
| title_full | Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa |
| title_fullStr | Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa |
| title_full_unstemmed | Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa |
| title_short | Identication of semiochemicals from four major insect pests of Eucalyptus and Pinus species in South Africa |
| title_sort | identication of semiochemicals from four major insect pests of eucalyptus and pinus species in south africa |
| topic | UCTD |
| url | http://hdl.handle.net/2263/78160 |