Blackleg (Leptosphaeria maculans) Severity and Yield Loss in Canola in Alberta, Canada

Blackleg, caused by Leptosphaeria maculans, is an important disease of oilseed rape (Brassica napus L.) in Canada and throughout the world. Severe epidemics of blackleg can result in significant yield losses. Understanding disease-yield relationships is a prerequisite for measuring the agronomic eff...

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Main Authors: Sheau-Fang Hwang, Stephen E. Strelkov, Gary Peng, Hafiz Ahmed, Qixing Zhou, George Turnbull
Format: Article
Language:English
Published: MDPI AG 2016-07-01
Series:Plants
Subjects:
Online Access:http://www.mdpi.com/2223-7747/5/3/31
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author Sheau-Fang Hwang
Stephen E. Strelkov
Gary Peng
Hafiz Ahmed
Qixing Zhou
George Turnbull
author_facet Sheau-Fang Hwang
Stephen E. Strelkov
Gary Peng
Hafiz Ahmed
Qixing Zhou
George Turnbull
author_sort Sheau-Fang Hwang
collection DOAJ
description Blackleg, caused by Leptosphaeria maculans, is an important disease of oilseed rape (Brassica napus L.) in Canada and throughout the world. Severe epidemics of blackleg can result in significant yield losses. Understanding disease-yield relationships is a prerequisite for measuring the agronomic efficacy and economic benefits of control methods. Field experiments were conducted in 2013, 2014, and 2015 to determine the relationship between blackleg disease severity and yield in a susceptible cultivar and in moderately resistant to resistant canola hybrids. Disease severity was lower, and seed yield was 120%–128% greater, in the moderately resistant to resistant hybrids compared with the susceptible cultivar. Regression analysis showed that pod number and seed yield declined linearly as blackleg severity increased. Seed yield per plant decreased by 1.8 g for each unit increase in disease severity, corresponding to a decline in yield of 17.2% for each unit increase in disease severity. Pyraclostrobin fungicide reduced disease severity in all site-years and increased yield. These results show that the reduction of blackleg in canola crops substantially improves yields.
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spelling doaj.art-8a6e20438b6f4e809ba8fae168cfd8de2022-12-22T04:06:19ZengMDPI AGPlants2223-77472016-07-01533110.3390/plants5030031plants5030031Blackleg (Leptosphaeria maculans) Severity and Yield Loss in Canola in Alberta, CanadaSheau-Fang Hwang0Stephen E. Strelkov1Gary Peng2Hafiz Ahmed3Qixing Zhou4George Turnbull5Crop Diversification Centre North, Alberta Agriculture and Forestry, Edmonton, AB T5Y 6H3, CanadaDepartment of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB T6G 2P5, CanadaSaskatoon Research and Development Centre, Agriculture and Agri-Food Canada, Saskatoon, SK S7N 0X2, CanadaCrop Diversification Centre North, Alberta Agriculture and Forestry, Edmonton, AB T5Y 6H3, CanadaCrop Diversification Centre North, Alberta Agriculture and Forestry, Edmonton, AB T5Y 6H3, CanadaCrop Diversification Centre North, Alberta Agriculture and Forestry, Edmonton, AB T5Y 6H3, CanadaBlackleg, caused by Leptosphaeria maculans, is an important disease of oilseed rape (Brassica napus L.) in Canada and throughout the world. Severe epidemics of blackleg can result in significant yield losses. Understanding disease-yield relationships is a prerequisite for measuring the agronomic efficacy and economic benefits of control methods. Field experiments were conducted in 2013, 2014, and 2015 to determine the relationship between blackleg disease severity and yield in a susceptible cultivar and in moderately resistant to resistant canola hybrids. Disease severity was lower, and seed yield was 120%–128% greater, in the moderately resistant to resistant hybrids compared with the susceptible cultivar. Regression analysis showed that pod number and seed yield declined linearly as blackleg severity increased. Seed yield per plant decreased by 1.8 g for each unit increase in disease severity, corresponding to a decline in yield of 17.2% for each unit increase in disease severity. Pyraclostrobin fungicide reduced disease severity in all site-years and increased yield. These results show that the reduction of blackleg in canola crops substantially improves yields.http://www.mdpi.com/2223-7747/5/3/31canolaLeptosphaeria maculansblacklegyield loss model
spellingShingle Sheau-Fang Hwang
Stephen E. Strelkov
Gary Peng
Hafiz Ahmed
Qixing Zhou
George Turnbull
Blackleg (Leptosphaeria maculans) Severity and Yield Loss in Canola in Alberta, Canada
Plants
canola
Leptosphaeria maculans
blackleg
yield loss model
title Blackleg (Leptosphaeria maculans) Severity and Yield Loss in Canola in Alberta, Canada
title_full Blackleg (Leptosphaeria maculans) Severity and Yield Loss in Canola in Alberta, Canada
title_fullStr Blackleg (Leptosphaeria maculans) Severity and Yield Loss in Canola in Alberta, Canada
title_full_unstemmed Blackleg (Leptosphaeria maculans) Severity and Yield Loss in Canola in Alberta, Canada
title_short Blackleg (Leptosphaeria maculans) Severity and Yield Loss in Canola in Alberta, Canada
title_sort blackleg leptosphaeria maculans severity and yield loss in canola in alberta canada
topic canola
Leptosphaeria maculans
blackleg
yield loss model
url http://www.mdpi.com/2223-7747/5/3/31
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