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Constitutive chemical defense of Eucalyptus against herbivory by Gonipterus sp. n. 2
Thesis (PhD (Zoology))--University of Pretoria, 2019.
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University of Pretoria
2024
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| _version_ | 1867613460053884928 |
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| access_status_str | Open Access |
| author2 | Hammerbacher, Almuth |
| author_browse | Hammerbacher, Almuth |
| author_facet | Hammerbacher, Almuth |
| collection | Thesis |
| dc_rights_str_mv | © 2021 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 (Zoology))--University of Pretoria, 2019. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/98033 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:36:29.578Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| 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:2263/98033 Constitutive chemical defense of Eucalyptus against herbivory by Gonipterus sp. n. 2 Hammerbacher, Almuth u14029406@tuks.co.za Hurley, Brett P. Schröder, Michelle Joubert, Johannes Christoff UCTD Gonipterus scutellatus species Eucalyptus Gonipterus Thesis (PhD (Zoology))--University of Pretoria, 2019. The Gonipterus scutellatus species complex Gyllenhaal, 1833 (Curculionidae, Coleoptera) is comprised of 8 cryptic species native to East Australia and Tasmania. Of these 8 species only G. platensis, G. pulverulentus and Gonipterus sp. n. 2 are invasive pests. Gonipterus sp. n. 2 was first discovered outside of its native range in 1916 in South Africa, and caused widespread defoliation of Eucalyptus trees, preferentially feeding on young leaves and new shoots. In 1926 Anaphes nitens Girault, 1928 (Hymenoptera: Mymaridae), an egg parasitoid, was discovered and released in South Africa. Anaphes nitens was historically very effective until the early 2000’s when large outbreaks of the beetle were occurring with increasing frequency. Therefore, investigations for alternative management options were initiated. Both biopesticides and pesticides were tested. However, biopesticides showed little reduction in beetle populations and pesticides are expensive and under legislative control, thus lowering accessibility and hampering large scale use, which results in inefficient control of the beetle. However, Gonipterus sp. n. 2 shows a very distinct host selection behavior, preferentially feeding on certain Eucalyptus species and not at all on others. Several studies have indicated Eucalyptus defense compounds, (such as 1,8-cineole) which may be able to repel Gonipterus sp. n. 2 and could partially explain this selective feeding behavior. Therefore, understanding these compounds which potentially mediate the feeding behavior of Gonipterus sp. n. 2 can offer an alternative control strategy for these beetles. However, this feeding preference has not been studied in depth and more research is needed to understand how these compounds can be developed into a control measure for commercial Eucalyptus plantations. Therefore, the inherent resistance mechanisms of the plant against feeding by Gonipterus sp. n. 2 should further investigated. Zoology and Entomology PhD (Zoology) Unrestricted Faculty of Natural and Agricultural Sciences 2024-09-05T07:44:06Z 2024-09-05T07:44:06Z 2020-04 2019 Thesis * A2020 http://hdl.handle.net/2263/98033 en © 2021 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 Gonipterus scutellatus species Eucalyptus Gonipterus Constitutive chemical defense of Eucalyptus against herbivory by Gonipterus sp. n. 2 |
| title | Constitutive chemical defense of Eucalyptus against herbivory by Gonipterus sp. n. 2 |
| title_full | Constitutive chemical defense of Eucalyptus against herbivory by Gonipterus sp. n. 2 |
| title_fullStr | Constitutive chemical defense of Eucalyptus against herbivory by Gonipterus sp. n. 2 |
| title_full_unstemmed | Constitutive chemical defense of Eucalyptus against herbivory by Gonipterus sp. n. 2 |
| title_short | Constitutive chemical defense of Eucalyptus against herbivory by Gonipterus sp. n. 2 |
| title_sort | constitutive chemical defense of eucalyptus against herbivory by gonipterus sp n 2 |
| topic | UCTD Gonipterus scutellatus species Eucalyptus Gonipterus |
| url | http://hdl.handle.net/2263/98033 |