1. Septoria leaf and glume blotch Pycnidia on winter wheat (infected last fall) Conidiospores (from pycnidia)

2. Tan spot Pyrenophora tritici-repentis Small, tan, lens- shaped spots

3. Disease cycle Survives on residue Requires 6h – 2d of moisture Yield loss can occur when the pathogen infects the flag leaf during heading Potential yield should be 45 bu/a dryland and 75 bu/a irrigated for fungicide application (Tilt 2+2, many others) Testing ½ rate Stratego with herbicide appl. Residue reduction? Septoria Tan spot

4. Control Fungicide (2 oz Tilt) Rotation with non-hosts Residue reduction

5. Yield (bu/a) CountyUntreatedTreatedRatioYield difference (bu/a) Pondera44.545.51.0 Pondera63.0 1.00.0 Pondera37.0 1.00.0 Pondera0.0 Liberty30.0 1.00.0 Liberty115.0 1.00.0 Choteau84.088.01.04.0 Choteau39.040.01.0 Choteauunknown 1.0 Choteauunknown 0.0 Toole31.331.61.00.3 Toole14.012.00.9-2.0 Toole41.039.01.0-2.0 Fungicide trial, Winter Wheat Stratego 5 oz/a with herbicide

6. Fungicide trial: Spring Wheat Stratego 5 oz/a w/ herbicide Yield (bu/a) CountyUntreatedTreatedRatioYield Difference (bu/a) Daniels9.015.51.76.5 Daniels31.423.80.8-7.6 Daniels28.219.20.7-9.0 Sheridan34.0 1.00.0 Sheridan40.045.01.15.0 Roosevelt85.0 1.00.0 Roosevelt22.620.60.9-2.0 Richland27.029.51.12.5

7. Winter wheat: 50% ↑ yield Spring wheat: 36% ↑ yield Overall: 44% of fields ↑ yield (at least 0.3 bu/a; avg. increase = 2 bu/a)