A model for fungicide applications in winter wheat

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A model for fungicide applications in winter wheat

• Plantekongressen 10-11. januar 2006
• Session 98.3
• Jens Erik Ørum
• Institute of Food and Resource Economics
• Lise Nistrup Jørgensen og Hans Pinnschmidt,
• Danmarks JordbrugsForskning

FØDEVAREØKONOMISK INSTITUT DEN KGL. VETERINÆR- OG
LANBOHØJSKOLE
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The model

• Dose-response functions for fungicides
  controlling rust, mildew and Septoria diseases
• Varieties resistance classes
• Fungicide strategies with respect to timing,
  active ingredients, and doses
• Estimated on 625 field trials selected in the
  Landsforsøgene 1998-2003

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Timing and strategies

• A Gs. 25 -31 Early mildew
• B Gs. 32-36 Early app. in susceptible v.
• C Gs. 37-50 Early app. in more resist. v.
• D Gs. 51-64 Ear protection
• E Gs. 65-70 Supplemental ear protection
• A strategy with (two) applications in gs. 37-39
  and gs. 51-54 is called a CD strategy

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Response functions

• Relative response
• Yield gain
• R0 for the most susceptible varieties
• R1 for fully resistant varieties

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Potential yield gain (hkg per ha)
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Potential yield gain (hkg per ha)
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Average net yield gain in susceptible var. on
Zealand
Average (hkg per ha)
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Variation in net yield gain in susceptible var.
on Zealand
Standard dev. (hkg perha)
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Online support tool Planteinfo
http//pvo.planteinfo.dk/cp/applications/reg
ionalyield.aspx
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Bornholm (C eller D)
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Zealand (C or D)
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Conclusion

• The new model will be a useful tool for farmers
  looking for economically efficient fungicide
  strategies and doses
• Before this the model has to be ..
• Updated with the development in eg. strubilorin
  resistant Septoria and new active ingredients
• Reestimated with the newest field trial results

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A model for fungicide applications in winter wheat

• END!
• Jens Erik Ørum
• Lise Nistrup Jørgensen
• and Hans Pinnschmidt

FØDEVAREØKONOMISK INSTITUT DEN KGL. VETERINÆR- OG
LANBOHØJSKOLE