Kutcher stripe rust_symposium_izmir_28.04.
Transcript of Kutcher stripe rust_symposium_izmir_28.04.
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Fungicide application at flowering provides effective control of stripe rust in wheat in western Canada. 2nd International Wheat Stripe Rust Symposium, Izmir, Turkey, 2014Hadley Kutcher and Jianfeng LiuCrop Development Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
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Stripe rust on winter wheat
Stripe rust pustules on seedling winter wheat leaf, October 2010, Saskatchewan
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Saskatchewan stripe rust survey 2013
Saskatoon
Regina
Prince Albert
Severe (infected leaf area 40 - 90%)
Moderate (10 - 20%)
Light (4 - 9%)
Trace (1-3%)
No stripe rust found
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Stripe rust• In 2011, yield losses in
western Canada on:S varieties: up to 35%, I varieties: up to 20%R varieties: up to 10%
R varieties - Lillian; many durum varieties
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• Not necessary if growing a resistant cultivar
• Goal is to protect the flag and penultimate leaves
• Application timing is unknown• Very high rate of disease increase
under ideal conditions
Foliar fungicide to control stripe rust of wheat
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• Varieties - AC Barrie: (S)- CDC Imagine: Yr18 (MR)- Lillian: Yr18 & Yr36 (R)
• Fungicide - tebuconzole (Folicur®) 1) unsprayed check 2) stem elongation 3) 50% anthesis 4) early milk 5) all three stages
Fungicide and variety experiments
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Fungicide and variety experiments
• Two seeding dates:early (mid-May), andlate (early June)
• Three locations over 3 years
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Saskatoon 2012 early seed date – stripe rust severity
0
10
20
30
40
50
60
70
AC Barrie
CDC Imagine
Lillian
Str
ipe
ru
st s
eve
rity
%
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Saskatoon 2012 late seeding date – stripe rust severity
0
10
20
30
40
50
60
70
80
AC Barrie
CDC Imagine
Lillian
Str
ipe
ru
st s
eve
rity
(%
)
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Unsprayed Stem elongation 50% anthesis Early milk Fungicide at all stages
2000
2500
3000
3500
4000
4500
2012 early seeding – yield of the susceptible cv. AC Barrie
Yie
ld (
kg/h
a)
Yield benefit (%) 10.4 8.3 12.6
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Unsprayed Stem elongation 50% anthesis Early milk Fungicide at all stages
2000
2500
3000
3500
4000
4500
2012 early seeding – yield of MR cv. CDC Imagine (Yr18)
Yie
ld (
kg/h
a)
Yield benefit (%) 4.5 8.4 8.8 6.9
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ns
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Yield benefit (%) 25 38* 12 40*
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Yield benefit (%) 46 36 27 40
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Preliminary conclusions:• Under the conditions of this study,
stripe rust was not observed on a highly resistant variety (Yr18 + Yr36), and yield loss was minimal on an MR variety (Yr18),
• fungicide is effective on susceptible cultivars, but time of application is very important, and this will vary with environment and seeding date,
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Preliminary conclusions:• generally the best control was achieved when
fungicide was applied during flowering,• a single well-timed fungicide application was
equally effective to control stripe rust and improve yield as three applications, and
• yield benefits of fungicide application were as much as 46% on a stripe rust susceptible variety.
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Acknowledgements• Jess Taylor, Tatiana Vera, Tim Dament and Jill
Woytowich for technical support, and • To the funders of this project: