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December 2017 Update

• 38 Oilseed rape leaf samples received in December 2017
• 12 samples have tested positive for signs of light leaf spot as early sporulation
• We have started to see some obvious lesions now in a few of the Scottish samples [image above]

The map below shows where LLS has been picked up.

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Summary from October to December 2017

218 Oilseed rape leaf samples assessed up to the end of December 2017
44 samples have tested positive for signs of light leaf spot as early sporulation
135 samples have tested positive for phoma

First signs of light leaf spot (after incubation) seen regionally:

East of England on 11th to 19th October
Scottish Borders on 19th October
West of England 10th to 15th November
The Midlands 17th to 28th November
North of England (South Yorkshire) on 23rd November

Oilseed Rape in East of England typically drilled 1 week earlier (16th August to 4th September) than in West and North of England (24th August to 7th September).

First signs of light leaf spot seen in non-incubated samples on:
15th November in Ceredigion and on 5th December in Herefordshire

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Oilseed rape agronomy advice

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