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Wheat Disease Update (07/12/18)

Common Foliar Diseases, Rust Diseases, Fusarium Head Blight (Scab) Risk

Wheat Disease Update


Common Foliar Diseases

Bacterial leaf streak and tan spot are the two most common diseases being detected in wheat fields. Last week the NDSU IPM scouts identified bacterial leaf streak in 28% of the wheat fields and tan spot in 21% of the fields. Bacterial leaf streak was commonly found on flag leaves (Figure 1), whereas tan spot was primarily in the mid to lower canopy. I have visited a few fields where bacterial leaf streak will likely cause some yield loss.

 

Rust Diseases

Barley leaf rust was found by Brittney Aasand (IPM Scout) on July 2 in Foster County. Wheat leaf rust (Figure 2) was found on July 10 in Morton County and Adams County while visiting hard red spring wheat breeding plots. This is the latest report of a cereal rust in the state in the past six years. At this point in the growing season, it is unlikely that cereal rusts will lead to any yield loss.

 

Fusarium Head Blight (Scab) Risk

Scab risk for susceptible late planted spring wheat and durum is moderate to high for several areas across the state (Figure 3). A moderate to high scab risk will likely remain for these areas in the upcoming days due to high humidity and recent thunderstorms. Also, now is a good time to start scouting fields that have entered early dough stages of development for “scabby” heads and be on the lookout for partially bleached (partially green/partially white) wheat spikes.

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Andrew Friskop

Extension Plant Pathology, Cereal Crops

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