Syngenta Summer Autumn Guide 2020 - Page 57



To help plan drill date deficit over BYDV risk, the charts
on the left help illustrate this. Hybrid Barley drilled into
November will need increased seed rates as it is not as
resilient as our Wheat varieties. Prioritise Hybrid Barley for
early drill timings.
YIELD WHEN DRILLED IN OCT
% Yield decrease when drilled early or late
5
Yield when drilled in October
0
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-5
A higher seed rate may help to mitigate establishment
losses where drilling has been delayed. Some guidance
on our varieties is listed below. Choosing the right seed
treatment is also an important decision and can improve
speed of crop establishment, number of plants established
and rooting which is especially important in delayed drill
situations to maximise crop resilience.
-10
-15
-20
GLEAM
Grafton
CLICK TO SEE our Rooting & Establishment
section for more information
KWS Santiago
Drilling: September November
Source: Syngenta drill date trials 16-18
VARIETY
EARLIEST
DRILLING DATE
SEPT
WK1
SEPT
WK2
SEPT
WK3
SEPT
WK4
OCT
WK1
OCT
WK2
OCT
WK3
OCT
WK4
NOV
WK1
NOV
WK2
NOV
WK3
NOV
WK4
LATEST SAFE
SOWING DATE
Graham
1st week Sept
275
275
275
300
300
325
325
350
350
375
375
400
End Jan
Gleam
1 week Sept
275
275
275
325
325
350
350
350
375
375
375
400
End Feb
Gallant
Mid Sept
275
275
300
300
325
325
350
350
375
375
400
End Jan
SY Insitor
Mid Sept
275
325
325
350
350
375
375
375
400
400
End Jan
Shabras
Mid Sept
275
325
325
350
350
375
375
375
400
400
End Jan
Craft
1st week Sept
275
275
300
300
300
325
325
350
350
375
375
400
End Dec
Electrum
1 week Sept
275
275
300
300
300
325
325
350
350
375
375
400
End Dec
Flagon
Mid September
275
300
300
300
300
300
325
325
350
375
400
End Dec
Hyvido
Mid September
200
200
200
220
220
220
250
250
End Oct
Hyvido Mid September
black-grass
250
250
250
275
275
275
300
300
End Oct
st
st
APHID RESISTANCE
There are three main aphids that spread BYDV: Bird
cherry-oat aphid, grain aphid, rose grain aphid.
Bird cherry-oat aphids have no known resistance to
pyrethroids. Therefore, good control will be achieved if
an appropriate product is applied accurately at the right
timing.
Grain aphids can carry KDR resistance to pyrethroids.
However, partial to good control with full rates of
aphicides can still be achieved in field scenarios.
Rose grain aphids have started to show some level
of resistance although the mechanism is not fully
understood, again full rate applications of aphicides and
correct application timings are needed in order to achieve
control.
57

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