Impact of Fungicide Application and Host Genotype on Susceptibility of <i>Brassica napus</i> to Sclerotinia Stem Rot across the South-Western Australian Grain Belt: A Genotype × Environment × Management Study
Sclerotinia stem rot (SSR), caused by the necrotroph <i>Sclerotinia sclerotiorum</i> Lib. (de Bary), is a major disease of canola in Australia, greatly reducing yields in high infection years. This study investigated genotype by environment by management interactions at 25 sites across t...
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doaj-c659539757864857ae0a5c8272105c7e2021-06-30T23:39:14ZengMDPI AGAgronomy2073-43952021-06-01111170117010.3390/agronomy11061170Impact of Fungicide Application and Host Genotype on Susceptibility of <i>Brassica napus</i> to Sclerotinia Stem Rot across the South-Western Australian Grain Belt: A Genotype × Environment × Management StudySarita Jane Bennett0Ashmita Rijal Lamichhane1Linda L. Thomson2King Yin Lui3Pippa J. Michael4Centre for Crop and Disease Management, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaCentre for Crop and Disease Management, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaCentre for Crop and Disease Management, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaCentre for Crop and Disease Management, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaCentre for Crop and Disease Management, Curtin University, GPO Box U1987, Perth, WA 6845, AustraliaSclerotinia stem rot (SSR), caused by the necrotroph <i>Sclerotinia sclerotiorum</i> Lib. (de Bary), is a major disease of canola in Australia, greatly reducing yields in high infection years. This study investigated genotype by environment by management interactions at 25 sites across the south-west Australian grainbelt from 2017 to 2020. Up to 10 canola varieties were grown each year with +/− fungicide application at 30% flowering. Disease incidence was low, with less than 20% infection recorded across most sites. Most variation in yield occurred between sites, rather than by management or variety, due to the environmental differences between the sites. Petal assays were found to be a poor indicator of later disease severity, suggesting the winter growing season in south-west Australia does not have reliable conducive conditions for disease development following petal drop in canola. The Additive Main Effects and Multiplicative Interaction model (AMMI) indicated that the open-pollinated varieties were broadly adapted and stable when fungicide was applied but became unstable with no fungicide, indicating SSR has a significant impact on yield when disease incidence is higher. This study highlights that further research is necessary to determine disease thresholds that lead to significant yield loss.https://www.mdpi.com/2073-4395/11/6/1170<i>Sclerotinia sclerotiorum</i>canolacrop yieldintegrated pest managementsclerotia |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Sarita Jane Bennett Ashmita Rijal Lamichhane Linda L. Thomson King Yin Lui Pippa J. Michael |
spellingShingle |
Sarita Jane Bennett Ashmita Rijal Lamichhane Linda L. Thomson King Yin Lui Pippa J. Michael Impact of Fungicide Application and Host Genotype on Susceptibility of <i>Brassica napus</i> to Sclerotinia Stem Rot across the South-Western Australian Grain Belt: A Genotype × Environment × Management Study Agronomy <i>Sclerotinia sclerotiorum</i> canola crop yield integrated pest management sclerotia |
author_facet |
Sarita Jane Bennett Ashmita Rijal Lamichhane Linda L. Thomson King Yin Lui Pippa J. Michael |
author_sort |
Sarita Jane Bennett |
title |
Impact of Fungicide Application and Host Genotype on Susceptibility of <i>Brassica napus</i> to Sclerotinia Stem Rot across the South-Western Australian Grain Belt: A Genotype × Environment × Management Study |
title_short |
Impact of Fungicide Application and Host Genotype on Susceptibility of <i>Brassica napus</i> to Sclerotinia Stem Rot across the South-Western Australian Grain Belt: A Genotype × Environment × Management Study |
title_full |
Impact of Fungicide Application and Host Genotype on Susceptibility of <i>Brassica napus</i> to Sclerotinia Stem Rot across the South-Western Australian Grain Belt: A Genotype × Environment × Management Study |
title_fullStr |
Impact of Fungicide Application and Host Genotype on Susceptibility of <i>Brassica napus</i> to Sclerotinia Stem Rot across the South-Western Australian Grain Belt: A Genotype × Environment × Management Study |
title_full_unstemmed |
Impact of Fungicide Application and Host Genotype on Susceptibility of <i>Brassica napus</i> to Sclerotinia Stem Rot across the South-Western Australian Grain Belt: A Genotype × Environment × Management Study |
title_sort |
impact of fungicide application and host genotype on susceptibility of <i>brassica napus</i> to sclerotinia stem rot across the south-western australian grain belt: a genotype × environment × management study |
publisher |
MDPI AG |
series |
Agronomy |
issn |
2073-4395 |
publishDate |
2021-06-01 |
description |
Sclerotinia stem rot (SSR), caused by the necrotroph <i>Sclerotinia sclerotiorum</i> Lib. (de Bary), is a major disease of canola in Australia, greatly reducing yields in high infection years. This study investigated genotype by environment by management interactions at 25 sites across the south-west Australian grainbelt from 2017 to 2020. Up to 10 canola varieties were grown each year with +/− fungicide application at 30% flowering. Disease incidence was low, with less than 20% infection recorded across most sites. Most variation in yield occurred between sites, rather than by management or variety, due to the environmental differences between the sites. Petal assays were found to be a poor indicator of later disease severity, suggesting the winter growing season in south-west Australia does not have reliable conducive conditions for disease development following petal drop in canola. The Additive Main Effects and Multiplicative Interaction model (AMMI) indicated that the open-pollinated varieties were broadly adapted and stable when fungicide was applied but became unstable with no fungicide, indicating SSR has a significant impact on yield when disease incidence is higher. This study highlights that further research is necessary to determine disease thresholds that lead to significant yield loss. |
topic |
<i>Sclerotinia sclerotiorum</i> canola crop yield integrated pest management sclerotia |
url |
https://www.mdpi.com/2073-4395/11/6/1170 |
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