Act now to combat light leaf spot
Light leaf spot infections have been identified in oilseed rape crops across the UK – indicating that growers should remain vigilant for disease on- set this winter and consider a fungi- cide spray before Christmas. An increasing number of leaf sam-
AHDB Potatoes strategy director
Rob Clayton said the latest campaign was being launched in response to mar- ket conditions caused by the coronavi- rus pandemic. More details will be re- leased soon.
Harvest
conditions have been easier on some farms
than others [photo credit: Tim Scrivener]
ples have tested positive for light leaf spot since Bayer’s SpotCheck service re-opened for submissions from farm- ers and agronomists in October. By 9 November, 50 out of 102 sam- ples had revealed 10% incidence of light leaf spot or more, after three days of incubation. Of these, 19 sam- ples showed 50% disease incidence or more.
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Wide area Positive samples were received from a wide geographic area. They included samples from Lincolnshire, Norfolk, Suffolk, Cambridgeshire and Kent –
as well as further West from Somer- set and Wiltshire, Scotland and the north of England. Bayer commercial technical man- ager Ella Crawford said: “Light leaf spot infections in early November in crops in East Anglia, the south coast and the west of England are further evidence of the southerly march of this disease.” Winter funcigide applications can protect lower crop canopies, and pre- vent disease spreading to the pods in the spring during stem extension. Fun- gicides only offer protectant activity, so timing sprays depends on catching the disease early.
“Where fungicides applications are being planned this side of Christmas, growers should consider using a prod- uct such as Proline which offers activ- ity against light leaf spot as well as Phoma,” said Ms Crawford.
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