Quantifying Yield Losses in Canola (<i>Brassica napus</i>) Caused by <i>Verticillium longisporum</i>
Verticillium stripe, a soilborne disease of canola (<i>Brassica napus</i>) caused by <i>Verticillium longisporum</i>, was first identified on the Canadian Prairies in 2014. Despite its increasing incidence, the impact of this disease on canola yields has not been quantified....
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MDPI AG
2025-04-01
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| Series: | Horticulturae |
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| Online Access: | https://www.mdpi.com/2311-7524/11/5/494 |
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| author | Ji Cui Stephen E. Strelkov Sheau-Fang Hwang |
| author_facet | Ji Cui Stephen E. Strelkov Sheau-Fang Hwang |
| author_sort | Ji Cui |
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| description | Verticillium stripe, a soilborne disease of canola (<i>Brassica napus</i>) caused by <i>Verticillium longisporum</i>, was first identified on the Canadian Prairies in 2014. Despite its increasing incidence, the impact of this disease on canola yields has not been quantified. To address this gap, the relationship between Verticillium stripe severity and yield was investigated in two canola hybrids, ‘45H31’ and ‘CS2000’, at two infested field sites near St. Albert, Alberta, in 2020 and 2021. In 2020, a year with above-average rainfall, both hybrids developed moderate levels of the disease, whereas in 2021, a drought year, symptoms and signs of infection were milder. Regression analysis indicated that seed yield per plant declined with increasing Verticillium stripe severity in both years of the study. In both hybrids, the relationship between disease severity and yield was best explained by second-degree quadratic equations. Although single-plant seed yield declined by up to 80% with increasing Verticillium stripe severity, these reductions did not translate into significant yield losses at the plot level, suggesting that losses experienced by individual plants were offset by reduced competition among the surviving plants. These results underscore the complexity of assessing disease impacts solely based on symptom severity. |
| format | Article |
| id | doaj-art-af7b22f5d05b4969a639ffcde5cd0d12 |
| institution | Kabale University |
| issn | 2311-7524 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | MDPI AG |
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| series | Horticulturae |
| spelling | doaj-art-af7b22f5d05b4969a639ffcde5cd0d122025-08-20T03:47:59ZengMDPI AGHorticulturae2311-75242025-04-0111549410.3390/horticulturae11050494Quantifying Yield Losses in Canola (<i>Brassica napus</i>) Caused by <i>Verticillium longisporum</i>Ji Cui0Stephen E. Strelkov1Sheau-Fang Hwang2Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, CanadaDepartment of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, CanadaDepartment of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, CanadaVerticillium stripe, a soilborne disease of canola (<i>Brassica napus</i>) caused by <i>Verticillium longisporum</i>, was first identified on the Canadian Prairies in 2014. Despite its increasing incidence, the impact of this disease on canola yields has not been quantified. To address this gap, the relationship between Verticillium stripe severity and yield was investigated in two canola hybrids, ‘45H31’ and ‘CS2000’, at two infested field sites near St. Albert, Alberta, in 2020 and 2021. In 2020, a year with above-average rainfall, both hybrids developed moderate levels of the disease, whereas in 2021, a drought year, symptoms and signs of infection were milder. Regression analysis indicated that seed yield per plant declined with increasing Verticillium stripe severity in both years of the study. In both hybrids, the relationship between disease severity and yield was best explained by second-degree quadratic equations. Although single-plant seed yield declined by up to 80% with increasing Verticillium stripe severity, these reductions did not translate into significant yield losses at the plot level, suggesting that losses experienced by individual plants were offset by reduced competition among the surviving plants. These results underscore the complexity of assessing disease impacts solely based on symptom severity.https://www.mdpi.com/2311-7524/11/5/494<i>Brassica napus</i>canola<i>Verticillium longisporum</i>Verticillium stripeyield |
| spellingShingle | Ji Cui Stephen E. Strelkov Sheau-Fang Hwang Quantifying Yield Losses in Canola (<i>Brassica napus</i>) Caused by <i>Verticillium longisporum</i> Horticulturae <i>Brassica napus</i> canola <i>Verticillium longisporum</i> Verticillium stripe yield |
| title | Quantifying Yield Losses in Canola (<i>Brassica napus</i>) Caused by <i>Verticillium longisporum</i> |
| title_full | Quantifying Yield Losses in Canola (<i>Brassica napus</i>) Caused by <i>Verticillium longisporum</i> |
| title_fullStr | Quantifying Yield Losses in Canola (<i>Brassica napus</i>) Caused by <i>Verticillium longisporum</i> |
| title_full_unstemmed | Quantifying Yield Losses in Canola (<i>Brassica napus</i>) Caused by <i>Verticillium longisporum</i> |
| title_short | Quantifying Yield Losses in Canola (<i>Brassica napus</i>) Caused by <i>Verticillium longisporum</i> |
| title_sort | quantifying yield losses in canola i brassica napus i caused by i verticillium longisporum i |
| topic | <i>Brassica napus</i> canola <i>Verticillium longisporum</i> Verticillium stripe yield |
| url | https://www.mdpi.com/2311-7524/11/5/494 |
| work_keys_str_mv | AT jicui quantifyingyieldlossesincanolaibrassicanapusicausedbyiverticilliumlongisporumi AT stephenestrelkov quantifyingyieldlossesincanolaibrassicanapusicausedbyiverticilliumlongisporumi AT sheaufanghwang quantifyingyieldlossesincanolaibrassicanapusicausedbyiverticilliumlongisporumi |