High yellows in OSR

Agriculture & Industry News - 12th May 2015

EARLY results from a nationwide survey indicate high incidences of TuYV infection in oilseed rape. Conducted by Dr John Walsh of Warwick University on behalf of breeders Limagrain UK, the survey, which will be completed by the end of May, will provide a comprehensive indication of TuYV infection hot-spots across the country. TuYV is thought to be the most important, yet least understood viral disease in OSR.

“Overall results so far are showing generally high levels of infection across the three regions that have been tested as part of a PhD project led by Dr Walsh; results from the south of England have detected incidences of as high as 80%, in Somerset up to 74% and in Yorkshire up to 72%, whereas in Cardiganshire we found incidences of up to 46%.”

Dr Walsh believes that these high incidences have come about as a result of the high numbers of aphids flying last autumn and to some extent the lack of neonicotinoid seed treatments. “What we do know is that high levels of TuYV infection can lead to substantial yield penalty as we very clearly saw in many areas in continental Europe last year. In locations with high levels of virus, resistant varieties could out yield non-resistant varieties by 10-15%,” says Dr Vasilis Gegas, senior oilseed rape breeder with Limagrain.

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