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Dry Edible Bean Rust Update (08/06/20)

Dry bean rust is being found in North Dakota.

Dry bean rust is being found in North Dakota.  Conditions have been and remain favorable for the development of rust; moderate/warm temperatures and heavy dews.  Growers are encouraged to scout for dry bean rust, and manage the disease if necessary.  Dry bean rust develops first in hot spots and eventually will spread to upper leaves throughout a field. The disease is identified by cinnamon-brown pustules containing spores (Figure 1).  Growers who have sprayed for white mold will likely have some extra protection against rust, as most fungicides have some efficacy against the disease (the triazoles and strobilurin tend to be most effective, but other products commonly applied for white mold still have some preventative activity). As the crop begins to mature (such as when pintos begin striping) no action is necessary.  For more information on bean rust, please visit my previous article in the July 23rd issue of the Crop and Pest Report.

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Sam Markell

Extension Plant Pathologist, Broad-leaf Crops

 

Brandt Berghuis

Graduate Research Assistant and Ph.D. Student

NDSU Plant Pathology

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