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  • 56

    Applied Crop Protection 2016

    III Control of diseases in different cultivars Lise Nistrup Jrgensen, Hans-Peter Madsen, Helene Saltoft Kristjansen, Sidsel Kirkegaard & Anders Almskou-Dahlgaard

    Control strategies in 6 wheat cultivarsSix different control strategies were compared in 3 different wheat cultivars and 3 mixtures of cultivars (Table 1). One of the treatments included the use of the decision support system Crop Protection Online to evaluate the need for treatments. The trials were sited at two localities one at Aarhus University (AU) Flakkebjerg and one near Horsens with LMO. The treatments according to Crop Protection Online are shown in Table 2.

    The following strategies were tested:1. Untreated2. 0.75 l/ha Ceando/0.75 l/ha Viverda + 0.75 l/ha Ultimate S (GS 37-39 & 55)3. 1.25 l/ha Viverda + 1.0 l/ha Ultimate S (GS 39-45)4. 0.5 l/ha Propulse/0.5 l/ha Proline Xpert (GS 37-39 & 55)5. 1.0 l/ha Folpan 500/0.75 l/ha Viverda + 0.75 l/ha Ultimate S/0.5 l/ha Proline Xpert (GS 31-32 & GS

    37-39 & 55)6. Crop Protection Online (CPO) (Table 2)7. Moist model8. 0.5 l/ha Prosaro/1.0 l/ha Librax/0.5 l/ha Proline Xpert (GS 31 & 33-37 & 55)

    Results from the two trials are listed in Table 3.

    Table 1. Included cultivars and mixtures in the trials and their disease and yield score from 2015.

    Cultivars % Septoria % yellow rust Yield (relative)Mixture 1 Benchmark

    TorpNuffieldKWS Lissy

    11996

    Ave. 8.8

    80.1

    0.080.8

    Ave. 2.2

    108105104106

    Ave. 106Mixture 2 Pistoria

    CreatorAlbertSheriff

    3.82.03.33.5

    Ave. 3.2

    054

    0.4Ave. 2.4

    10291

    10099

    Ave. 98Mixture 3 Ohio

    JensenViborgKWS Nils

    4.37.09.08.0

    Ave. 7.1

    0.011.4

    0.040.01

    Ave. 0.4

    9795

    100100

    Ave. 98Benchmark 11 8 108Substance 8 64 102Torp 9 0.1 108

  • 57

    Use of cultivar mixtures is one way of reducing disease attack and possibly making the se-lection for new aggressive Septoria strains less likely. This applies to both strains which are resistant to fungicides and strains which develop aggressiveness to resistant cultivars. The two trials from 2016 showed that cultivar mixture 2 of cultivars which has good resistance against Septoria could stand alone without a need for treatments and still be high yielding (Figure 1). More exploitation of these options should be looked into in order to sustain future control of Septoria.

    Overall the best net yield results were obtained from 2 treatments using Propulse followed by Proline Xpert. Substance gave the highest net yield responses and in this crop 1 treatment was inferior.

    Table 2. Treatments applied following recommendations from Crop Protection Online. 16350-1 and 16350-2.

    Cultivars 16350-1 Date and GS Products l/ha TFI Costs hkg/haMixture 1 01-06-2016 (GS 55) 0.3 Bell + 0.2 Proline 0.36+0.25 3.0

    Mixture 2 01-06-2016 (GS 55) 0.3 Bell + 0.2 Proline 0.36+0.25 3.0

    Mixture 3 01-06-2016 (GS 55) 0.3 Bell + 0.2 Proline 0.36+0.25 3.0Benchmark 25-5-2016 (GS 39)

    01-06-2016 (GS 55)0.47 Proline Xpert0.3 Bell + 0.2 Proline

    0.530.36+0.25

    5.6

    Substance 04-05-2016 (GS 31)25-5-2016 (GS 51)

    0.29 Prosaro0.47 Proline Xpert

    0.360.32

    4.3

    Torp 01-06-2016 (GS 55) 0.3 Bell + 0.2 Proline 0.36+0.25 3.0

    Cultivars 16350-2 Date and GS Products l/ha TFI Costs hkg/haMixture 1 25-05-2016 (GS 37) 0.47 Proline Xpert 0.53 2.6Mixture 2 25-05-2016 (GS 37) 0.47 Proline Xpert 0.53 2.6Mixture 3 25-05-2016 (GS 37) 0.47 Proline Xpert 0.53 2.6Benchmark 25-05-2016 (GS 37) 0.47 Proline Xpert 0.53 2.6Substance 25-05-2016 (GS 37) 0.47 Proline Xpert 0.53 4.2

    07-06-2016 (GS 55) 0.12 Rubric + 0.12 Comet Pro 0.22Torp 25-05-2016 (GS 37) 0.47 Proline Xpert 0.53 2.6

  • 58

    Figure 1.Datafrom2fieldtrialswithdifferentcultivarsandmixtures.Responsetodifferentcontrolstrategiesusing1,2or3applicationsandfinaleconomicresponse.

  • 59

    Culti

    vars

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    epto

    ria, le

    af 1,

    GS

    73-7

    7%

    Sep

    toria

    , leaf

    2, G

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    -77

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    Mixtu

    re 1

    16.9

    7.54.4

    4.95.7

    9.443

    .723

    .512

    .013

    .014

    .522

    .5Mi

    xture

    210

    .32.5

    1.71.9

    4.73.5

    18.7

    8.85.5

    7.212

    .514

    .5Mi

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    321

    .25.7

    5.24.9

    8.211

    .242

    .519

    .216

    .017

    .521

    .025

    .4Be

    nchm

    ark

    19.5

    7.86.0

    5.55.1

    11.4

    58.3

    24.4

    20.0

    20.4

    15.5

    28.4

    Subs

    tance

    21.7

    16.7

    6.78.4

    9.29.2

    50.0

    38.4

    21.7

    25.0

    24.2

    27.5

    Torp

    28.9

    8.97.8

    7.76.8

    12.7

    55.0

    27.5

    22.2

    18.7

    17.8

    30.9

    Aver

    age

    19.7

    8.25.3

    5.56.6

    9.544

    .723

    .616

    .217

    .017

    .624

    .8No

    . of tr

    ials

    22

    Culti

    vars

    % co

    ntro

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    toria

    , leaf

    1, G

    S 73

    -77

    % co

    ntro

    l, Sep

    toria

    , leaf

    2, G

    S 73

    -77

    Untr.

    0.75 C

    eand

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    0.75 V

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    1.25 V

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    0.5 P

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    Pro

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    Pro

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    Mixtu

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    16.9

    55.6

    74.3

    71.3

    66.6

    44.7

    43.7

    46.2

    72.5

    70.3

    66.8

    48.5

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    re 2

    10.3

    75.7

    83.5

    82.0

    54.4

    66.0

    18.7

    52.9

    70.6

    61.5

    33.2

    22.5

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    21.2

    73.3

    75.7

    77.1

    61.6

    47.4

    42.5

    54.9

    62.4

    58.8

    50.6

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    .560

    .069

    .271

    .874

    .141

    .858

    .358

    .265

    .765

    .173

    .451

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    .723

    .369

    .461

    .557

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    .356

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    22

    Tab

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  • 60

    Culti

    vars

    % g

    reen

    area

    , leaf

    2, G

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    TGW

    (g)

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    0.75 C

    eand

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    0.75 V

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    0.5 P

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    1.0 F

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    ltim

    ate S

    / 0.5

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    line X

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    Untr.

    0.75 C

    eand

    o /

    0.75 V

    iverd

    a +

    0.75 U

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    ate S

    1.25 V

    iverd

    a +

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    ltim

    ate S

    0.5 P

    ropu

    lse /

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    e Xp

    ert

    1.0 F

    olpa

    n /

    0.75 V

    iverd

    a +

    0.75 U

    ltim

    ate S

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