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

Autor: Huang YJ; Centre for Agriculture, Food & Environmental Management, School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire, UK., Sidique SNM; Centre for Agriculture, Food & Environmental Management, School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire, UK., Karandeni Dewage CS; Centre for Agriculture, Food & Environmental Management, School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire, UK., Gajula LH; Centre for Agriculture, Food & Environmental Management, School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire, UK., Mitrousia GK; Centre for Agriculture, Food & Environmental Management, School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire, UK.; Protecting Crops and Environment Department, Rothamsted Research, Harpenden, Hertfordshire, UK., Qi A; Centre for Agriculture, Food & Environmental Management, School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire, UK., West JS; Protecting Crops and Environment Department, Rothamsted Research, Harpenden, Hertfordshire, UK., Fitt BD; Centre for Agriculture, Food & Environmental Management, School of Life and Medical Sciences, University of Hertfordshire, Hertfordshire, UK.
Jazyk: angličtina
Zdroj: Pest management science [Pest Manag Sci] 2024 May; Vol. 80 (5), pp. 2405-2415. Date of Electronic Publication: 2022 Nov 10.
DOI: 10.1002/ps.7248
Abstrakt: 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 can no longer be ignored. Effective control of phoma stem canker epidemics needs to target both L. maculans and L. biglobosa. © 2022 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
(© 2022 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.)
Databáze: MEDLINE
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