Rhyncosporium attacks Regina in south-west


By Farmers Weekly staff


NEW races of rhynchosporium could be overcoming Regina winter barleys formerly good resistance, warns NIAB.


Unexpectedly high levels of the disease in the south-west are showing up in DuPont/NIAB monitoring.


“This may be due to new races,” says NIABs plant pathologist John Clarkson.


With 10% of the varietys leaf area affected at one site in Cornwall, its resistance rating could be reduced from its current 8, he believes.


Intro, which has a rating of 6, has only 7% infection at the same site.


“Its a bit speculative at the moment, but Id feel a lot happier with Regina on 7,” says Mr Clarkson.


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