2020 Colorado Wheat Disease Summary

Tessa Albrecht: tessa.albrecht@colostate.edu
Punya Nachappa: punya.nachappa@colostate.edu

Tan spot. Early in the season we had high incidence of tan spot in the lower canopy, but it
did not persist into the upper canopy and severity was relatively low. Tan spot is favored by cool wet conditions, so it typically does not persist in our region unless we have unusually high moisture or wheat is under irrigation. Fungal spores that cause tan spot survive in wheat stubble, so non-host rotation and control of wheat residue are important
management strategies. Tan spot can be controlled during the growing season with foliar
fungicide application.

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