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<p>It is well established that over-winter temperatures are a key determinant of aphid
populations in the following year. Low temperatures, and in particular sharp frosts,
will reduce aphid numbers and so the recent cold weather is likely to ease aphid pressures
in 2021.</p><p> </p><p>Temperature effects are built into the long-established Rothamsted
model used to forecast virus pressures. That forecast will be made on 1 March and
will be used to determine whether the threshold for using the neonicotinoid seed treatment
Cruiser SB has been met. Once the virus forecast has been made, the British Beet Research
Organisation will publish an advisory bulletin setting this out.</p>
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