Written by Charlotte Cunningham
AHDB’s light leaf spot (LLS) preliminary forecast shows that the disease risk to winter oilseed rape (OSR) is relatively high across central Britain. Charlotte Cunningham reports. The regional disease forecast highlights the proportion of OSR crops with a disease resistance rating of 5 predicted to have more than 25% of plants affected by the spring. For southern England, risk is slightly higher than forecast during 2018/19 but remains relatively low, according to AHDB. Historically, risk is more serious toward the north of Britain. However, the 2019/20 forecast shows that the risk is moderate for much of Scotland. Jon West, who manages the forecast at Rothamsted Research, said: “A relatively warm summer and low disease levels at the end of last season have driven down the light leaf spot risk across Scotland. In fact, you have to go back to the 2013/14 season to find a lower-risk year. “Most of the Midlands, Wales and the north of England is forecast to be at a relatively high risk of this disease. However, this risk level could not be described as unusually high for these areas.” Management decisions The forecast can guide crop management decisions and for a more accurate picture of local…
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