Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
An investigation on factors influencing the rearing and success of biological control agents of Gonipterus sp. n. 2 (Coleoptera: Curculionidae)
Dissertation (MSc (Entomology))--University of Pretoria, 2023.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Published: |
University of Pretoria
2023
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613629216456704 |
|---|---|
| access_status_str | Open Access |
| author2 | Hurley, Brett P. |
| author_browse | Hurley, Brett P. |
| author_facet | Hurley, Brett P. |
| collection | Thesis |
| dc_rights_str_mv | © 2023 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 | Dissertation (MSc (Entomology))--University of Pretoria, 2023. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/91623 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:11.002Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| 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:2263/91623 An investigation on factors influencing the rearing and success of biological control agents of Gonipterus sp. n. 2 (Coleoptera: Curculionidae) Hurley, Brett P. albertina.makowe@up.ac.za Schröder, Michelle Makowe, Idea Albertina UCTD Biological control Gonipterus sp. n. 2 Centrodora damoni Natural enemies Parasitoids Dissertation (MSc (Entomology))--University of Pretoria, 2023. Gonipterus scutellatus species complex is a cryptic species that feeds on Eucalyptus leaves. Both the adult and larval stages cause high levels of defoliation. Gonipterus sp. n. 2 is the species present in South Africa and Anaphes nitens was released as a biological control agent. However, Gonipterus spp. populations have continued to cause economic damage and various countries continue to seek additional biological control agents. This dissertation focused on understanding how natural enemies interact if multiple species are released in a biological control programme. The biology of one potential parasitoid of Gonipterus sp. n. 2, Centrodora damoni was investigated. It was shown that the parasitoid’s longevity, host age preference and developmental time are ideal for it to be a successful biological control agent. The success of the biological control of Gonipterus sp. n. 2 was also investigated by studying the reproductive development of the beetle and linking it to its seasonal egg production in the laboratory. The preoviposition period for Gonipterus sp. n. 2 was 30 days and oviposition occurred when the beetles were four weeks of age. Various factors that influence the rearing techniques were considered in this study including how the techniques affect preparation for releases. Four parasitoids that were reared in the laboratory, namely Anaphes inexpectatus, Centrodora damoni, Cleruchoides noackae and Selitrichodes neseri were measured to investigate the effect of rearing on parasitoid fitness using body size as a proxy across nine generations, six generations, nine generations and five generations respectively. Rearing reduced body size significantly over two generations for C. noackae and C. damoni. S. neseri had significant differences in body size between some generations but the first and last generations studied had no differences. A. inexpectatus did not exhibit any loss in body size across generations. TPCP Zoology and Entomology MSc (Entomology) Unrestricted 2023-07-25T13:13:13Z 2023-07-25T13:13:13Z 2023-09 2023 Dissertation * S2023 http://hdl.handle.net/2263/91623 10.25403/UPresearchdata.23735304 © 2023 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 Biological control Gonipterus sp. n. 2 Centrodora damoni Natural enemies Parasitoids An investigation on factors influencing the rearing and success of biological control agents of Gonipterus sp. n. 2 (Coleoptera: Curculionidae) |
| title | An investigation on factors influencing the rearing and success of biological control agents of Gonipterus sp. n. 2 (Coleoptera: Curculionidae) |
| title_full | An investigation on factors influencing the rearing and success of biological control agents of Gonipterus sp. n. 2 (Coleoptera: Curculionidae) |
| title_fullStr | An investigation on factors influencing the rearing and success of biological control agents of Gonipterus sp. n. 2 (Coleoptera: Curculionidae) |
| title_full_unstemmed | An investigation on factors influencing the rearing and success of biological control agents of Gonipterus sp. n. 2 (Coleoptera: Curculionidae) |
| title_short | An investigation on factors influencing the rearing and success of biological control agents of Gonipterus sp. n. 2 (Coleoptera: Curculionidae) |
| title_sort | investigation on factors influencing the rearing and success of biological control agents of gonipterus sp n 2 coleoptera curculionidae |
| topic | UCTD Biological control Gonipterus sp. n. 2 Centrodora damoni Natural enemies Parasitoids |
| url | http://hdl.handle.net/2263/91623 |