Effective control of Leptosphaeria maculans increases importance of L. biglobosa as a cause of phoma stem canker epidemics on oilseed rape

A - Papers appearing in refereed journals

Huang, Y-J., Sidique, S. N. M., Dewage, C. S. K., Gajula, L. H., Mitrousia, G. K., Qi, A., West, J. S. and Fitt, B. D. L. 2022. Effective control of Leptosphaeria maculans increases importance of L. biglobosa as a cause of phoma stem canker epidemics on oilseed rape. Pest Management Science. https://doi.org/10.1002/ps.7248

AuthorsHuang, Y-J., Sidique, S. N. M., Dewage, C. S. K., Gajula, L. H., Mitrousia, G. K., Qi, A., West, J. S. and Fitt, B. D. L.
Abstract

BACKGROUND: Phoma stem canker is a damaging disease of oilseed rape caused by two related fungal species, Leptosphaeria maculans and L. biglobosa. However, previous work has mainly focused on L. maculans and there has been little work on L. biglobosa. This work provides evidence of the importance of L. biglobosa to stem canker epidemics in the UK.
RESULTS: Quantification of L. maculans and L. biglobosa DNA using species-specific quantitative PCR showed that L. biglobosa caused both upper stem lesions and stem base cankers on nine oilseed rape cultivars in the UK. Upper stem lesions were mainly caused by L. biglobosa. For stem base cankers, there was more L. maculans DNA than L. biglobosa DNA in the susceptible cultivar Drakkar, while there was more L. biglobosa DNA than L. maculans DNA in cultivars with the resistance gene Rlm7 against L. maculans. The frequency of L. biglobosa detected in stem base cankers increased from 14% in 2000 to 95% in 2013. Ascospores of L. biglobosa and L. maculans were mostly released on the same days and the number of L. biglobosa ascospores in air samples increased from the 2010/2011 to 2012/2013 growing seasons.
CONCLUSION: Effective control of L. maculans increased infection by L. biglobosa, causing severe upper stem lesions and stem base cankers, leading to yield losses. The importance of L. biglobosa to phoma stem canker epidemics needs to target both L. maculans and L. biglobosa.

KeywordsBlackleg; canola; Canola; Coexistent pathogens; Disease control; Phoma stem canker; Yield loss; Oilseed rape
Year of Publication2022
JournalPest Management Science
Digital Object Identifier (DOI)https://doi.org/10.1002/ps.7248
Web address (URL)https://onlinelibrary.wiley.com/doi/full/10.1002/ps.7248
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Innovate UK
Department of Environment, Food and Rural Affairs
Funder project or code'Innovate UK': Advancing Earth Observation Applications in Agriculture:developing wall-to-wall data products to improve environmental compliance
BB/M028348/1
BB/P00489X/1
BB/I02100
BB/I0107585
Publisher's version
Accepted author manuscript
Supplemental file
Output statusPublished
Publication dates
Online26 Oct 2022
Publication process dates
Accepted26 Oct 2022
PublisherWiley
ISSN1526-498X

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