First report of glyphosate-resistant downy brome (Bromus tectorum L.) in Canada
Abstract Glyphosate is the most used herbicide worldwide, and is an important source of economical weed control in glyphosate-resistant crops, and conservation tillage systems, among other uses. Downy brome (Bromus tectorum L.), otherwise known as cheatgrass, is a highly invasive winter-annual grass...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-11-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-21942-6 |
| _version_ | 1817970336348504064 |
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| author | Charles M. Geddes Mattea M. Pittman |
| author_facet | Charles M. Geddes Mattea M. Pittman |
| author_sort | Charles M. Geddes |
| collection | DOAJ |
| description | Abstract Glyphosate is the most used herbicide worldwide, and is an important source of economical weed control in glyphosate-resistant crops, and conservation tillage systems, among other uses. Downy brome (Bromus tectorum L.), otherwise known as cheatgrass, is a highly invasive winter-annual grass weed in cropping systems, pastureland, and naturalized or ruderal areas in western North America. In 2021, a downy brome population remained uncontrolled following four applications of glyphosate in a glyphosate-resistant canola (Brassica napus L.) field located in Taber County, Alberta, Canada. All individuals from the subsequent generation of the population survived glyphosate treatment at the typical field rate (900 g ae ha−1). In dose-response bioassays, the putative glyphosate-resistant population exhibited 10.6- to 11.9-fold, 7.7- to 8.7-fold, 7.8- to 8.8-fold, and 8.3- to 9.5-fold resistance to glyphosate based on plant survival, visible control, and biomass fresh weight and dry weight, respectively, compared with two susceptible populations 21 days after treatment. Estimated glyphosate rates for 80% control of this population ranged from 2795 to 4511 g ae ha−1; well above common usage rates. This downy brome population represents the first glyphosate-resistant grass weed confirmed in Canada, and the second weed species exhibiting glyphosate resistance in the Canadian prairie region. |
| first_indexed | 2024-04-13T20:32:51Z |
| format | Article |
| id | doaj.art-f3ca312844a14491968cc524eb792dce |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-13T20:32:51Z |
| publishDate | 2022-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-f3ca312844a14491968cc524eb792dce2022-12-22T02:31:08ZengNature PortfolioScientific Reports2045-23222022-11-011211910.1038/s41598-022-21942-6First report of glyphosate-resistant downy brome (Bromus tectorum L.) in CanadaCharles M. Geddes0Mattea M. Pittman1Agriculture and Agri-Food Canada, Lethbridge Research and Development CentreAgriculture and Agri-Food Canada, Lethbridge Research and Development CentreAbstract Glyphosate is the most used herbicide worldwide, and is an important source of economical weed control in glyphosate-resistant crops, and conservation tillage systems, among other uses. Downy brome (Bromus tectorum L.), otherwise known as cheatgrass, is a highly invasive winter-annual grass weed in cropping systems, pastureland, and naturalized or ruderal areas in western North America. In 2021, a downy brome population remained uncontrolled following four applications of glyphosate in a glyphosate-resistant canola (Brassica napus L.) field located in Taber County, Alberta, Canada. All individuals from the subsequent generation of the population survived glyphosate treatment at the typical field rate (900 g ae ha−1). In dose-response bioassays, the putative glyphosate-resistant population exhibited 10.6- to 11.9-fold, 7.7- to 8.7-fold, 7.8- to 8.8-fold, and 8.3- to 9.5-fold resistance to glyphosate based on plant survival, visible control, and biomass fresh weight and dry weight, respectively, compared with two susceptible populations 21 days after treatment. Estimated glyphosate rates for 80% control of this population ranged from 2795 to 4511 g ae ha−1; well above common usage rates. This downy brome population represents the first glyphosate-resistant grass weed confirmed in Canada, and the second weed species exhibiting glyphosate resistance in the Canadian prairie region.https://doi.org/10.1038/s41598-022-21942-6 |
| spellingShingle | Charles M. Geddes Mattea M. Pittman First report of glyphosate-resistant downy brome (Bromus tectorum L.) in Canada Scientific Reports |
| title | First report of glyphosate-resistant downy brome (Bromus tectorum L.) in Canada |
| title_full | First report of glyphosate-resistant downy brome (Bromus tectorum L.) in Canada |
| title_fullStr | First report of glyphosate-resistant downy brome (Bromus tectorum L.) in Canada |
| title_full_unstemmed | First report of glyphosate-resistant downy brome (Bromus tectorum L.) in Canada |
| title_short | First report of glyphosate-resistant downy brome (Bromus tectorum L.) in Canada |
| title_sort | first report of glyphosate resistant downy brome bromus tectorum l in canada |
| url | https://doi.org/10.1038/s41598-022-21942-6 |
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