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

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Presentation transcript:

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

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

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

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

Yield (bu/a) CountyUntreatedTreatedRatioYield difference (bu/a) Pondera Pondera Pondera Pondera0.0 Liberty Liberty Choteau Choteau Choteauunknown 1.0 Choteauunknown 0.0 Toole Toole Toole Fungicide trial, Winter Wheat Stratego 5 oz/a with herbicide

Fungicide trial: Spring Wheat Stratego 5 oz/a w/ herbicide Yield (bu/a) CountyUntreatedTreatedRatioYield Difference (bu/a) Daniels Daniels Daniels Sheridan Sheridan Roosevelt Roosevelt Richland

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