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<p>The rate of incidence of YV may vary year-to-year, influenced by environmental
conditions. The rate is not yet known at the time of planting sugar-beet, however.
There is a means to predict the scale of threat. That is through the YV incidence
prediction model developed and run by Rothamsted Research. This provides, a forecast
of the level of YV infection that will be reached in August, in the absence of any
plant protection intervention. Making the prediction on 1 March allows the model to
take account of preceding winter temperatures, which are important in determining
the likely incidence of YV. Forecast for Yellows Virus incidence from Rothamsted Research
for 2023 is 67.5%.</p>
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