HUTCHINSONS~FieldWise(August2019) - Page 1

BYDV Management
and delayed drilling
David Howard (Regional Technical Manager) explains that with the revocation of neonicotinoid
seed treatments (Deter) this Autumn, this will be the first year where all crops will be unprotected
against Barley Yellow Dwarf Virus (BYDV), which raises the risk of crop infection considerably.
BYDV is a highly damaging virus
capable of causing up to 30% yield
loss in winter wheat and 75% yield
loss in winter barley. It is also a
persistent virus, meaning once
an aphid is infected it carries that
infection for life. It takes only 16-24
hours feeding for an aphid to pick
up the virus from an infected plant
and just 4-8 hours feeding to pass
it on to non-infected plants. That
means virus spread can happen very
quickly, placing great importance
on accurate timing of both drilling
and insecticide applications.
BYDV risk management will take
careful combination of both
cultural and chemical methods to
reduce the likelihood of infection.
Key technique:
delayed drilling
One of the key management
techniques will be delaying the
drilling of cereal crops to reduce
the period of exposure to potential
infection periods. There are 2 key
BYDV Vectors which are Grain aphid
and Bird Cherry aphid. Migration
of these aphids usually begins in
September and October whilst
temperatures remain high, then
slows once temperatures drop
below 11C, which is the minimum
temperature required for
aphid flight.
This means that the later the crop is
drilled the lower the risk of repeated
influx of aphids.
Delaying drilling into late Octoberearly November will help reduce
the risk period significantly.
Fieldwise has been allocated 2 BASIS
Crop Protection points for 2019/20.
To claim your points, please email your name and account number,
the reference code: CP/84148/1920/g to
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