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Diversity and virulence of the fungus Beauveria (Cordycipitaceae) species associated with Gonipterus sp. n. 2 (Coleoptera: Curculionidae) in South Africa
Dissertation (MSc (Entomology))--University of Pretoria, 2024.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2024
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| _version_ | 1867613513748316160 |
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| access_status_str | Open Access |
| author2 | Schröder, Michelle |
| author_browse | Schröder, Michelle |
| author_facet | Schröder, Michelle |
| 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, 2024. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/96494 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:20.986Z |
| 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:2263/96494 Diversity and virulence of the fungus Beauveria (Cordycipitaceae) species associated with Gonipterus sp. n. 2 (Coleoptera: Curculionidae) in South Africa Schröder, Michelle marizanne.jones@up.ac.za Hurley, Brett P. Slippers, Bernard Jones, Marizanne UCTD Beauveria bassiana Cryptic species Biological control Diversity Virulence Gonipterus sp. n. 2 Entomopathogenic fungi Dissertation (MSc (Entomology))--University of Pretoria, 2024. In South African forestry, the Eucalyptus snout beetle, Gonipterus sp. n. 2 (Coleoptera: Curculionidae), has become an economically important invasive pest. The adults and larvae feed on leaves and cause severe damage to Eucalyptus plantations. The egg parasitoid, Anaphes nitens Girault (Hymenoptera: Mymaridae) was introduced to control Gonipterus sp. n. 2 populations, but additional biological control is necessary. Entomopathogenic fungi (EPF) can potentially be used effectively together with A. nitens, as they can target different life stages. Entomopathogenic fungi are able to infect host insects by direct contact to the insect cuticle, killing the host and sporulating on the dead insect to infect unsuspecting healthy hosts. This study focussed on the Beauveria bassiana (Bals.-Criv.) Vuill. (Hypocreales: Cordycipitaceae) species associated with Gonipterus sp. n. 2, as well as their virulence towards adult beetles. The study found that B. bassiana cryptic species diversity was present in South Africa and associated with Gonipterus sp. n. 2. The newly described species, B. namnaoensis, as well as two novel species, Beauveria sp. nov. 1 and Beauveria sp. nov. 2 formed part of the B. bassiana cryptic species complex. Beauveria pseudobassiana species were also obtained from Gonipterus sp. n. 2 cadavers. The virulence of these species was analysed in virulence trials. Inter- and intraspecies variation in virulence were observed during the trials. The most virulent strains with the lowest survival of beetles belonged to B. namnaoensis and Beauveria sp. nov. 1. The least virulent strains with the highest beetle survivals recorded were that of two Beauveria sp. nov. 2 strains and one B. pseudobassiana strain. Moderate virulence and survival were attributed to one B. bassiana, B. pseudobassiana and two remaining Beauveria sp. nov. 2 strains. Thus, the most virulent strains of the newly described species, B. namnaoensis, as well as Beauveria sp. nov. 1 and Beauveria sp. nov. 2 could be considered for Gonipterus sp. n. 2 biological control in South African forestry. CPHB-TPCP NRF Zoology and Entomology MSc (Entomology) Unrestricted Faculty of Natural and Agricultural Sciences SDG-15: Life on land 2024-06-13T13:16:54Z 2024-06-13T13:16:54Z 2024-09 2024-02 Dissertation * S2024 http://hdl.handle.net/2263/96494 DOI: https://doi.org/10.25403/UPresearchdata.26028724.v1 https://doi.org/10.25403/UPresearchdata.26028724.v1 en © 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 Beauveria bassiana Cryptic species Biological control Diversity Virulence Gonipterus sp. n. 2 Entomopathogenic fungi Diversity and virulence of the fungus Beauveria (Cordycipitaceae) species associated with Gonipterus sp. n. 2 (Coleoptera: Curculionidae) in South Africa |
| title | Diversity and virulence of the fungus Beauveria (Cordycipitaceae) species associated with Gonipterus sp. n. 2 (Coleoptera: Curculionidae) in South Africa |
| title_full | Diversity and virulence of the fungus Beauveria (Cordycipitaceae) species associated with Gonipterus sp. n. 2 (Coleoptera: Curculionidae) in South Africa |
| title_fullStr | Diversity and virulence of the fungus Beauveria (Cordycipitaceae) species associated with Gonipterus sp. n. 2 (Coleoptera: Curculionidae) in South Africa |
| title_full_unstemmed | Diversity and virulence of the fungus Beauveria (Cordycipitaceae) species associated with Gonipterus sp. n. 2 (Coleoptera: Curculionidae) in South Africa |
| title_short | Diversity and virulence of the fungus Beauveria (Cordycipitaceae) species associated with Gonipterus sp. n. 2 (Coleoptera: Curculionidae) in South Africa |
| title_sort | diversity and virulence of the fungus beauveria cordycipitaceae species associated with gonipterus sp n 2 coleoptera curculionidae in south africa |
| topic | UCTD Beauveria bassiana Cryptic species Biological control Diversity Virulence Gonipterus sp. n. 2 Entomopathogenic fungi |
| url | http://hdl.handle.net/2263/96494 https://doi.org/10.25403/UPresearchdata.26028724.v1 |