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Stripe Rust Found in North Dakota (05/26/16)

On May 23rd, stripe rust was confirmed in winter wheat research plots in Cass County (found by Matt Breiland, Research Specialist) and Adams County (found by John Rickertson, Research Agronomist, Hettinger REC).

 

Stripe Rust Found in North Dakota

On May 23rd, stripe rust was confirmed in winter wheat research plots in Cass County (found by Matt Breiland, Research Specialist) and Adams County (found by John Rickertson, Research Agronomist, Hettinger REC). Although incidence was low at both locations, it provides a good reminder to start scouting wheat fields for stripe rust (Figure 1 and 2). Several Great Plain states have reported an early occurrence of stripe rust this year and the same can be said for North Dakota. Last year, stripe rust was reported on June 1 and resulted in significant yield losses (10 to 12 bushels) in susceptible spring wheat varieties. Although stripe rust is considered a cool season disease, a new population of the pathogen has adapted to warmer climates when sufficient moisture is available.

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Last year’s stripe rust epidemic provided important management information for NDSU researchers. Here are a few things we found out last year.

  • Variety Susceptibility – Most of the hard red spring wheat varieties grown in ND are either susceptible or moderately susceptible to stripe rust. Susceptibility ratings were performed at several locations and the information was used when compiling a stripe rust rating column for spring and winter wheat varieties in the NDSU selection guides:
    • Fungicides –In 2014, stripe rust was recorded in low levels on June 1 at the Fargo research plots and fungicide efficacy and timing trials were conducted. Results showed that fungicide timing was more important than the fungicide selected. Products containing triazoles (FRAC 3), strobilurins (FRAC 11) or mixed modes of action (combinations of FRAC 3, 7 and 11) are efficacious on stripe rust. Fungicides applied at the 4-6 leaf stage did not give adequate suppression of stripe rust resulting in little to no yield protection. Fungicides applied at flag leaf provided excellent management of stripe rust and yield values were approximately 10-12 bushels higher when compared to the non-treated check.

 

Andrew Friskop

Extension Plant Pathology, Cereal Crops

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