The gene in is an important source of resistance for control of phoma stem canker on oilseed rape caused by the fungus . This study shows the first report of isolates virulent against in the UK. isolates virulent against represented 3% of the pathogen population when cultivars with the gene represented 5% of the UK oilseed rape area in 2012/13. However, the gene has been widely used since then, representing >15% of the UK oilseed rape area in 2015/16. Winter oilseed rape field experiments included cultivars with the gene, with the gene or without genes and took place at five sites in the UK over four cropping seasons. An increase in phoma leaf spotting severity on cultivars in successive seasons was observed. Major resistance genes played a role in preventing severe phoma leaf spotting at the beginning of the cropping season and, in addition, quantitative resistance (QR) in the cultivars examined made an important contribution to control of phoma stem canker development at the end of the cropping season. Deployment of the resistance gene against in cultivars with QR in combination with sustainable disease management practices will prolong the use of this gene for effective control of phoma stem canker epidemics.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6108410 | PMC |
| http://dx.doi.org/10.1111/ppa.12845 | DOI Listing |
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