Blackleg Yield Losses and Interactions with Verticillium Stripe in Canola (<i>Brassica napus</i>) in Canada

Blackleg, caused by <i>Leptosphaeria maculans</i>, is an important disease of canola (<i>Brassica napus</i>). The pathogen can attack stems, leaves and pods, but basal stem cankers are most damaging and can result in significant yield losses. In Canada, Verticillium stripe (&...

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Main Authors: Yixiao Wang, Stephen E. Strelkov, Sheau-Fang Hwang
Format: Article
Language:English
Published: MDPI AG 2023-01-01
Series:Plants
Subjects:
Online Access:https://www.mdpi.com/2223-7747/12/3/434
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author Yixiao Wang
Stephen E. Strelkov
Sheau-Fang Hwang
author_facet Yixiao Wang
Stephen E. Strelkov
Sheau-Fang Hwang
author_sort Yixiao Wang
collection DOAJ
description Blackleg, caused by <i>Leptosphaeria maculans</i>, is an important disease of canola (<i>Brassica napus</i>). The pathogen can attack stems, leaves and pods, but basal stem cankers are most damaging and can result in significant yield losses. In Canada, Verticillium stripe (<i>Verticillium longisporum</i>) has recently emerged as another disease threat to canola. Symptoms of Verticillium stripe can resemble those of blackleg, and the two diseases may occur together. The effect of blackleg on yield was explored in field experiments with two canola hybrids and by evaluating a wider variety of hybrids in commercial crops in central Alberta, Canada. The impact on yield of <i>L. maculans</i>/<i>V. longisporum</i> interactions was also assessed under field and greenhouse conditions. In most hybrids, the relationship between blackleg severity and yield components was best explained by second-degree quadratic equations, although a linear relationship was found for one variety sampled in commercial fields. When <i>L. maculans</i> was co-inoculated with <i>V. longisporum</i>, blackleg severity and yield losses increased. In some cases, Verticillium stripe caused greater yield losses than blackleg. The results suggest that the interaction between <i>L. maculans</i>/<i>V. longisporum</i> may cause more severe losses in canola, highlighting the need for proactive disease management strategies.
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spelling doaj.art-d9e9688e69cd44a6972dad50ef6ab3292023-11-16T17:42:19ZengMDPI AGPlants2223-77472023-01-0112343410.3390/plants12030434Blackleg Yield Losses and Interactions with Verticillium Stripe in Canola (<i>Brassica napus</i>) in CanadaYixiao Wang0Stephen 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, CanadaBlackleg, caused by <i>Leptosphaeria maculans</i>, is an important disease of canola (<i>Brassica napus</i>). The pathogen can attack stems, leaves and pods, but basal stem cankers are most damaging and can result in significant yield losses. In Canada, Verticillium stripe (<i>Verticillium longisporum</i>) has recently emerged as another disease threat to canola. Symptoms of Verticillium stripe can resemble those of blackleg, and the two diseases may occur together. The effect of blackleg on yield was explored in field experiments with two canola hybrids and by evaluating a wider variety of hybrids in commercial crops in central Alberta, Canada. The impact on yield of <i>L. maculans</i>/<i>V. longisporum</i> interactions was also assessed under field and greenhouse conditions. In most hybrids, the relationship between blackleg severity and yield components was best explained by second-degree quadratic equations, although a linear relationship was found for one variety sampled in commercial fields. When <i>L. maculans</i> was co-inoculated with <i>V. longisporum</i>, blackleg severity and yield losses increased. In some cases, Verticillium stripe caused greater yield losses than blackleg. The results suggest that the interaction between <i>L. maculans</i>/<i>V. longisporum</i> may cause more severe losses in canola, highlighting the need for proactive disease management strategies.https://www.mdpi.com/2223-7747/12/3/434blackleg<i>Brassica napus</i>canolainteractionsVerticillium stripeyield losses
spellingShingle Yixiao Wang
Stephen E. Strelkov
Sheau-Fang Hwang
Blackleg Yield Losses and Interactions with Verticillium Stripe in Canola (<i>Brassica napus</i>) in Canada
Plants
blackleg
<i>Brassica napus</i>
canola
interactions
Verticillium stripe
yield losses
title Blackleg Yield Losses and Interactions with Verticillium Stripe in Canola (<i>Brassica napus</i>) in Canada
title_full Blackleg Yield Losses and Interactions with Verticillium Stripe in Canola (<i>Brassica napus</i>) in Canada
title_fullStr Blackleg Yield Losses and Interactions with Verticillium Stripe in Canola (<i>Brassica napus</i>) in Canada
title_full_unstemmed Blackleg Yield Losses and Interactions with Verticillium Stripe in Canola (<i>Brassica napus</i>) in Canada
title_short Blackleg Yield Losses and Interactions with Verticillium Stripe in Canola (<i>Brassica napus</i>) in Canada
title_sort blackleg yield losses and interactions with verticillium stripe in canola i brassica napus i in canada
topic blackleg
<i>Brassica napus</i>
canola
interactions
Verticillium stripe
yield losses
url https://www.mdpi.com/2223-7747/12/3/434
work_keys_str_mv AT yixiaowang blacklegyieldlossesandinteractionswithverticilliumstripeincanolaibrassicanapusiincanada
AT stephenestrelkov blacklegyieldlossesandinteractionswithverticilliumstripeincanolaibrassicanapusiincanada
AT sheaufanghwang blacklegyieldlossesandinteractionswithverticilliumstripeincanolaibrassicanapusiincanada