Foliar, seed and in furrow fungicides for management of wheat powdery mildew

2016
CC BY 4.0

Research organisatons
Funding source

Trial details

Researcher(s) Geoff Thomas (DAFWA)
Year(s) 2016
Contributor West Midlands Group
Trial location(s) Moora, WA
Foliar, seed and in furrow fungicides for management of wheat powdery mildew locations
Aims

To investigate the efficacy of seed dressing and fertiliser applied fungicides on the time of onset, rate of development and yield impact of wheat powdery mildew.

Key messages

At the time of first visit (30th May), plants were at ~3 leaf stage and no foliar disease was evident.  Seedling establishment showed no spatial differences, with average emergence of >100 plants / m2 in all treatments except those with triadimenol seed treatment where >20% reduction in emergence was noted.

Minimal foliar disease was evident at 7th July (~Z31) assessment, minor levels of Stagonospora nodorum (septoria nodorum blotch) (SNB) were evident in the lower canopy but severity was too low for fungicide differences to be assessed.  

Trace levels of powdery mildew (PM) were evident on stems and lowest canopy leaves of untreated plots at booting (27th July) when the second foliar spray was applied. Development of PM was slow and on 15th September (~Z69) average severity in untreated controls was <1% leaf area affected on top 3 leaves, with infection primarily restricted to Flag-2 (Table 1).

PM was also present on heads and stems at low severity at this time, however the distribution of disease, particularly on heads, was patchy across the trial making differentiating between treatments difficult. At this time only the booting foliar spray provided consistent significant reduction in incidence of powdery mildew on stems and leaves.

SNB was present at low levels throughout the season, assessments at head emergence (23rd August) showed a small but significant effect of foliar treatments (Z31 and Z45) and flutriafol and Uniform in-furrow on necrotic leaf area. Assessments 3 weeks later at Z69 indicated that flutriafol in-furrow, triadimenol seed dressing and both foliar spray timings were providing a small reduction (~8-15% leaf area) in necrosis associated with SNB infection (Table 1).

With late and patchy onset of PM, yield responses to fungicides were 0-320kg/ha, with only the flutriafol in-furrow treatment having significantly greater yield than the untreated control, this response is likely due to the reduction of SNB rather than any effect on powdery mildew. Neither foliar spray timing gave significant yield response. Reduced emergence in triadimenol treated plots resulted in a 15% yield reduction (Table 2).

At two other sites (Geraldton, Dalwallinu), where powdery mildew infection commenced during stem elongation, all tested seed dressing and in-furrow fungicides had significant impact on disease severity and incidence. At the one site (Geraldton) where powdery mildew was yield limiting, in-furrow and foliar fungicide treatments gave a significant yield response.

Lead research organisation Department of Agriculture and Food WA
Host research organisation West Midlands Group
Trial funding source GRDC DAW00229
Related program N/A
Acknowledgments

DAFWA research support unit Geraldton (S.Cosh, T.Bell) for trial management.

Michael Brennan and West Midlands Group (Moora) for site

DAFWA and GRDC (DAW00229) for funding.

Companies (BASF, Bayer, Four farmers, Syngenta) for product treatments.


Other trial partners Not specified
Download the trial report to view additional trial information

Method

Crop type Cereal (Grain): Wheat
Treatment type(s)
  • Fungicide: Type
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Moora 2016

Sow date 4 May 2016
Harvest date Not specified
Plot size 20m x 7m
Plot replication 3
Fungicide

Factor 1. Early season treatments

1.    Untreated

2.    Untreated

3.    Prosaro® 150ml/ha at Z31 (7th July)

4.    Flutriafol in-furrow (Flutriafol 250® 400mL/ha)

5.    Fluquinconazole on seed (Jockey Stayer® 450mL/100kg seed)

6.    Fluxapyroxad on seed (Systiva® 150mL/100kg seed)

7.    Triadimenol (Baytan T® 150mL/100kg seed)

8.    Triadimefon in-furrow (Triadimefon 500 Dry® 200g/ha)

9.    Azoxystrobin & Metalaxyl-M in-furrow (Uniform® 400mL/ha)

 &

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Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Moora, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Moora, WA Tenosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Moora WA
2016 102.8mm
2015 105.1mm
2014 88.5mm
2013 118.8mm
2012 138.2mm
2011 107.4mm
2010 102.0mm
2009 113.9mm
2008 120.4mm
2007 84.7mm
2006 113.8mm
2005 97.1mm
2004 75.7mm
2003 96.1mm
2002 77.2mm
2001 56.4mm
2000 110.9mm
National soil grid Source: CSIRO/TERN
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

Moora WA 2016


Observed climate information

Rainfall trial gsr (mm) 269mm

Derived climate information

Moora WA

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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 report and links

2016 trial report



Trial last modified: 23-07-2019 14:41pm AEST