Written by Charlotte Cunningham
Turnip Yellows Virus (TuYV) is becoming an increasing threat to UK oilseed rape crops, so vigilance and swift action over coming weeks will be essential to minimise its impact, according to the latest advice from Bayer. Charlotte Cunningham reports. The disease, which can reduce yields by 15-30%, is spread by the peach-potato aphid (Myzus persicae) and it’s thought that milder autumn weather, widespread pyrethroid resistance and the loss of neonicotinoid seed treatments are contributing to the growing threat. “We’ve seen quite high infection rates in recent seasons, particularly in eastern areas, but also elsewhere in the country,” says Suffolk-based Bayer commercial technical manager ,Ella Crawford. “With many growers in the south-east sowing earlier due to flea beetle, crops are potentially exposed to aphids for longer; the earlier infection occurs, the greater the potential yield loss. “The fact TuYV-resistant varieties are increasingly performing well, further indicates the disease is becoming more prevalent.” Rothamsted’s Dr Steve Foster agrees and warns that a high proportion of aphids carry the disease. Monitoring of M. persicae populations at one site in York two years ago found more than 80% of aphids carried TuYV, while at other Scottish sites the disease was present in at…
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