Interaction between fungicide program and in-crop nitrogen timing for the control of yellow leaf spot (YLS) in mid May sown wheat

2016

Research organisaton
Funding source

Trial details

Researcher(s) Nick Poole and Michael Straight (FAR Australia)
Year(s) 2016
Contributor Riverine Plains
Trial location(s) Coreen, NSW
Interaction between fungicide program and in-crop nitrogen timing for the control of yellow leaf spot (YLS) in mid May sown wheat locations
Aims

To examine the influence of two nitrogen timings: 40kg N/ha applied at tillering (GS22) or first node (GS31) or third node (GS 33) and four fungicide strategies on levels of yellow leaf spot (YLS).

Key messages

The level of yellow leaf spot (YLS — Pyrenophoratritici repentis) control achieved with fungicides applied at either first node (GS31) or third node (GS33) in a susceptible wheat-on-wheat situation (cv EGA Gregory) was between 25–50% in most assessments.
• This relatively poor level of disease control has been consistent across the four years of research.
• There was no significant yield response to fungicide application during 2016, but there was a trend for small yield gains where fungicide was applied at first node (GS31), or third node (GS33) or applied twice at first node (GS31) and third node (GS33).
• These small (0.15–0.25t/ha) yield increases have been common across the four years of trials, either from a single later spray at third node (GS33) or from two sprays where a third node (GS33) application was preceded with a tillering (GS23) or first node (GS31) spray.
• A single YLS fungicide application at tillering (GS23), carried out as part of a weed control spray, did not generally prove to be economical.
• Nitrogen (N) applied at tillering (GS23) or first node (GS31) has not produced statistical yield differences, but delaying the main nitrogen dose until third node (GS33) reduced yield by an average of 0.5t/ha compared with the first node
(GS31) timing during 2016.
• There were no significant differences in YLS severity due to fungicide product — Tilt® (propiconazole) and Prosaro® (prothioconazole and tebuconazole) — or nitrogen timing.

Lead research organisation Riverine Plains
Host research organisation Riverine Plains
Trial funding source GRDC RPI00009
Related program Maintaining profitable farming systems with retained stubble
Acknowledgments

The trial was carried out as part of the Riverine Plains Inc GRDC funded project Maintaining Profitable Farming Systems with Retained Stubble in the Riverine Plains Region (2013–18).


Other trial partners FAR Australia
Download the trial report to view additional trial information

Method

Crop type Wheat
Treatment type(s)
  • Fertiliser: Timing
  • Fungicide: Type
  • Fungicide: Timing
Trial type Experimental
Trial design Blocked

Coreen 2016

Sow date 12 May 2016
Harvest date 9 December 2016
Plot size Not specified
Plot replication Not specified
Herbicide

host farmer paddock management

Insecticide

host farmer paddock management

Other trial notes

GSR (Apr-Oct)

Coreen 2016

Sow date 12 May 2016
Harvest date 9 December 2016
Plot size Not specified
Plot replication Not specified
Herbicide

host farmer paddock management

Insecticide

host farmer paddock management

Other trial notes

GSR (Apr-Oct)

Coreen 2016

Sow date 12 May 2016
Harvest date 9 December 2016
Plot size Not specified
Plot replication Not specified
Herbicide

host farmer paddock management

Insecticide

host farmer paddock management

Other trial notes

GSR (Apr-Oct)

Download the trial report to view additional method/treatment information

Download results

Trial results Effect of fungicide type on grain and growth parameters at Coreen in 2016

@T1: GS33 @T2: GS55 @T3: GS61 @T4: GS65
# Treatment 1
Screenings (%) Test weight (kg/hL) Protein (%) Grain yield (t/ha) F-4 leaf area affected by yellow spot (%) F-2 leaf area affected by yellow spot (%) NDVI (.) F-3 leaf area affected by yellow spot (%) NDVI (.) Flag leaf area affected by yellow spot (%) F-1 leaf area affected by yellow spot (%) Green leaf retention (1-100) Green leaf retention (1-100) Flag leaf area affected by yellow spot (%) F-1 leaf area affected by yellow spot (%) NDVI (.)
1 Prosaro 2.4 82.1 9.1 3.54 52.8 1.9 0.69 11 0.65 1.4 8.6 51.2 54.5 7.5 42.4 0.58
1 Tilt 2.5 82.1 9 3.5 50.1 2 0.68 11.2 0.64 1.5 8.6 48.2 60.9 7.1 39.1 0.57
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Grain yield t/ha


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F-1 leaf area affected by yellow spot %


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F-2 leaf area affected by yellow spot %


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F-3 leaf area affected by yellow spot %


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F-4 leaf area affected by yellow spot %


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Flag leaf area affected by yellow spot %


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Green leaf retention 1-100


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NDVI .


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Protein %


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Screenings %


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Test weight kg/hL


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Trial results Effect of fungicide application timing on grain parameters at Coreen in 2016

@T1: @T2: @T3: @T4:
# Screenings (%) Test weight (kg/hL) Protein (%) Grain yield (t/ha) F-4 leaf area affected by yellow spot (%) F-2 leaf area affected by yellow spot (%) NDVI (.) F-3 leaf area affected by yellow spot (%) NDVI (.) Flag leaf area affected by yellow spot (%) F-1 leaf area affected by yellow spot (%) Green leaf retention (1-100) Green leaf retention (1-100) Flag leaf area affected by yellow spot (%) F-1 leaf area affected by yellow spot (%) NDVI (.)
1 No fungicide 2.4 81.6 9.2 3.42 60.6 2 0.69 12.2 0.65 1.9 11.8 36.4 37.4 9.9 62.6 0.59
1 Fungicide GS31 2.6 82.4 9 3.52 46.9 2 0.66 11.9 0.62 1.4 9.1 43.8 58.1 7.1 42 0.56
1 Fungicide GS33 2.4 82.2 9 3.55 0.68 0.65 1.2 7.1 57.4 64.2 5.9 29.7 0.57
1 Fungicide GS31 + GS33 2.4 82.2 8.9 3.59 0.7 0.66 1.2 6.4 61.2 71.3 6.2 28.7 0.59
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Grain yield t/ha


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F-1 leaf area affected by yellow spot %


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F-2 leaf area affected by yellow spot %


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F-3 leaf area affected by yellow spot %


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F-4 leaf area affected by yellow spot %


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Flag leaf area affected by yellow spot %


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Green leaf retention 1-100


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NDVI .


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Protein %


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Screenings %


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Test weight kg/hL


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Trial results Effect of nitrogen application timing on grain parameters at Coreen in 2016

@T1: @T2: @T3: @T4:
# Screenings (%) Test weight (kg/hL) Protein (%) Grain yield (t/ha) F-4 leaf area affected by yellow spot (%) F-2 leaf area affected by yellow spot (%) NDVI (.) F-3 leaf area affected by yellow spot (%) NDVI (.) Flag leaf area affected by yellow spot (%) F-1 leaf area affected by yellow spot (%) Green leaf retention (1-100) Green leaf retention (1-100) Flag leaf area affected by yellow spot (%) F-1 leaf area affected by yellow spot (%) NDVI (.)
1 Nitrogen GS 31 2.5 82.3 8.8 3.78 48.9 1.8 0.69 10.2 0.65 1.7 9.6 49 59.8 7.2 40.2 0.57
1 Nitrogen GS 33 2.4 81.9 9.3 3.26 53.9 2 0.68 12 0.64 1.2 7.6 50.4 55.6 7.4 41.3 0.57
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Grain yield t/ha


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F-1 leaf area affected by yellow spot %


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F-2 leaf area affected by yellow spot %


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F-3 leaf area affected by yellow spot %


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F-4 leaf area affected by yellow spot %


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Flag leaf area affected by yellow spot %


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Green leaf retention 1-100


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NDVI .


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Protein %


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Screenings %


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Test weight kg/hL


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Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Coreen, NSW Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Coreen, NSW Sodosol
National soil grid Source
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties

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Climate

Coreen NSW 2016


Observed climate information

Rainfall trial gsr (mm) 567mm

Coreen NSW 2016


Observed climate information

Rainfall trial gsr (mm) 567mm

Coreen NSW 2016


Observed climate information

Rainfall trial gsr (mm) 567mm

Derived climate information

Coreen NSW

NOTE: Exact trial site locality unknown - Climate data may not be accurate
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Some data on this site is sourced from the Bureau of Meteorology

SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.



Trial last modified: 28-11-2019 11:17am AEST