MONITORING REGIONAL DISEASE RISK
Data from the Defra-funded Winter Wheat Survey of England and Wales for the years 1998 to 2007
have been used to generate maps illustrating overall incidence and severity of individual
diseases of winter wheat over this period. Data for brown rust, Septoria tritici,
powdery mildew and yellow rust and fusarium ear blight are presented.
The survey data have been interpolated by kriging to produce a continuous surface of disease incidence.
In order to restrict the maps only to those locations where wheat is grown, the data have been
plotted onto a grid mask of the wheat cropping area.
Brown rust levels were low over the 10-year period covered by the survey. The spatially
interpolated view shows that the most severe cases of the disease were found south of the Wash, in
the South-East and in north Lincolnshire.
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The distribution of powdery mildew is interesting in that it forms a diagonal running in a
north easterly direction from the South-West to North East. It is most intense around
the Pennines.
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Yellow rust is practically absent in many years, but occasionally causes severe but localised
epidemics. Areas around the Wash, Oxfordshire and Staffordshire were the worst affected.
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