1. 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

2. 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

3. Timing and strategies AGs. 25 -31Early mildew BGs. 32-36Early app. in susceptible v. CGs. 37-50Early app. in more resist. v. DGs. 51-64Ear protection EGs. 65-70Supplemental ear protection A strategy with (two) applications in gs. 37-39 and gs. 51-54 is called a CD strategy

4. Response functions Relative response: Yield gain: R=0 for the most susceptible varieties R=1 for fully resistant varieties

5. Potential yield gain (hkg per ha)

7. Average net yield gain in susceptible var. on Zealand Average (hkg per ha)

8. Variation in net yield gain in susceptible var. on Zealand Standard dev. (hkg perha)

9. Online support tool Planteinfo http://pvo.planteinfo.dk/cp/applications/regionalyield.aspx

10. Bornholm (C eller D)

11. Zealand (C or D)

12. 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

13. 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