Hutchinsons FieldWise(MarchExtra2019) - Page 1



Fieldwise
AGRONOMY NEWS FROM
MARCH EXTRA 2019
Early Disease Control
in Winter Cereals
– stem extension fungicides
Dr David Ellerton (Hutchinsons Technical Development Director)
continues to highlight early disease control in winter cereals,
by explaining the benefits of stem extension fungicides.
Early disease infection can
significantly limit growth and yield
potential of both wheat and barley
and priority should be given to
keeping disease in check as soon
as spring growth begins.
Winter Wheat
Foliar diseases
Experience has highlighted the
difficulty of controlling Septoria
infections once they have become
established on the leaves.
Growers must try to ensure that the
disease is prevented from spreading
up the plant by adopting a strong
protectant approach, not just at the T0
(mid to late tillering) stage but also at the
so called T1 timing of GS 32, which is
targeted to protect final leaf 3. To avoid
foliar diseases infecting newly emerged
leaves, it is vital that the gap between
any T0 and T1 sprays should not
exceed 3 to 4 weeks and the inclusion
of a multi-site active ingredient, such as
chlorothalonil or folpet in any T1 spray
David Ellerton
TECHNICAL DEVELOPMENT DIRECTOR
will reduce the risk of relying on later,
restricted levels of curative control
of Septoria tritici, should it become
established within the crop.
The inclusion of other active ingredients
in the T1 spray should be determined by
disease risk, based on weather patterns
and varietal susceptibility.
Utilising the latest Seedstats
information, showing likely area of
varieties sown this season and the
latest AHDB recommended list for
disease susceptibility ratings, Table 1
below gives a clear insight as to the
disease risk of the probable top 10
varieties of winter wheat.
W.Wheat - Provisional % Market Shares
by Variety and Disease, Harvest, 2018 (England & Wales)
Variety
% area
Mildew
Y. Rust
B. Rust
S. nod
S.trit
E’spot
Fus.
Lodging
8
6
5.9
6
7
8
NEW RACES?
Skyfall
10.4
5
5
Graham
9.5
7
8
6
6
6.9
4
6
7
KWS Kerrin
7.4
6
7
6
6
6.4
4
6
7
RGT Gravity
7.1
4
8
6
6
5.0
4
6
7
KWS Siskin
6.8
8
9
5
7
6.7
4
5
6
Costello
5.6
8
9
5
6
6.1
4
7
7
Gleam
5.3
6
7
6
6
6.4
4
6
7
Crusoe
4.6
6
9
3
6
6.5
5
6
7
Elicit
4.6
6
9
7
6
6.0
4
7
7
Shabras
3.6
6
7
5
6
6.2
4
6
6
Table 1: Varietal disease susceptibilities of winter wheat ranked by likely area grown, 2017/2018 season
>

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