Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Investigating herbicide resistant ryegrass
Thesis (MScAgric)--Stellenbosch University, 2024.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | en_ZA en_ZA |
| Published: |
Stellenbosch : Stellenbosch University
2024
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613758718738432 |
|---|---|
| access_status_str | Open Access |
| author | Bestbeir, Louise |
| author2 | Viljoen, Charne |
| author_browse | Bestbeir, Louise Viljoen, Charne |
| author_facet | Viljoen, Charne Bestbeir, Louise |
| author_sort | Bestbeir, Louise |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MScAgric)--Stellenbosch University, 2024. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/130530 |
| institution | Stellenbosch University (South Africa) |
| language | en_ZA en_ZA |
| last_indexed | 2026-06-10T12:41:14.564Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2024 |
| publishDateRange | 2024 |
| publishDateSort | 2024 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/130530 Investigating herbicide resistant ryegrass Bestbeir, Louise Viljoen, Charne Pieterse, P. J. Stellenbosch University. Faculty of AgriSciences. Dept. of Agronomy. Herbicide resistance Glyphosate -- Physiological effect Plants -- Herbicide tolerance Ryegrasses -- South Africa Herbicides -- Application -- South Africa UCTD Thesis (MScAgric)--Stellenbosch University, 2024. ENGLISH ABSTRACT: Multiple herbicide resistance is an escalating problem in weeds globally. Ryegrass (Lolium spp.) is a major weed in grain cropping systems with documented cases of multiple herbicide resistance across the globe to various amalgamations of glufosinate‑ammonium, glyphosate, acetyl CoA carboxylase, and paraquat. In South Africa, ryegrass plants that survived herbicide applications were tested for multiple herbicide resistance while concurrently investigating spray deposition and adaptations to ryegrass biology based on cropping systems, i.e., Conservation Agriculture ryegrass from Langgewens Research Farm (LS), and resistance. Herbicide applications on young ryegrass plants show a lower spray deposition in terms of Fluorescent Particle Coverage (%) on the adaxis (0.31% ‑ 1.28%) than abaxis (3.93% ‑ 18.13%). Dose-response models varied due to unexpected dose range extremes and showed no paraquat resistance in the LS ryegrass with a lethal dose (LD50) of 0.482X, where X is the recommended dose. Extreme resistance was seen in ryegrass plants from Welgevallen Experimental Farm with differences between the ryegrass plants from the trial field (WS = 11.787X) and the ryegrass plants along the trial field perimeter (WP = 21.727X). Spearman correlations between ryegrass biology and resistance found a strong negative association (r = ‑0.80) between seed weight, mean germination percentage and resistance. Lastly, Welgevallen plants were confirmed to be the first case of glufosinate‑ammonium, glyphosate and paraquat multiple herbicide resistance in a single ryegrass population. AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar. Masters 2024-03-04T10:36:22Z 2024-04-26T20:57:56Z 2024-03-04T10:36:22Z 2024-04-26T20:57:56Z 2024-03 Thesis https://scholar.sun.ac.za/handle/10019.1/130530 en_ZA en_ZA Stellenbosch University 98 pages : illustrations application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Herbicide resistance Glyphosate -- Physiological effect Plants -- Herbicide tolerance Ryegrasses -- South Africa Herbicides -- Application -- South Africa UCTD Bestbeir, Louise Investigating herbicide resistant ryegrass |
| title | Investigating herbicide resistant ryegrass |
| title_full | Investigating herbicide resistant ryegrass |
| title_fullStr | Investigating herbicide resistant ryegrass |
| title_full_unstemmed | Investigating herbicide resistant ryegrass |
| title_short | Investigating herbicide resistant ryegrass |
| title_sort | investigating herbicide resistant ryegrass |
| topic | Herbicide resistance Glyphosate -- Physiological effect Plants -- Herbicide tolerance Ryegrasses -- South Africa Herbicides -- Application -- South Africa UCTD |
| url | https://scholar.sun.ac.za/handle/10019.1/130530 |
| work_keys_str_mv | AT bestbeirlouise investigatingherbicideresistantryegrass |