Crown rust infects oats, and its alternate host, buckthorn (Rhamnus spp.), was found with heavy crown rust spores throughout South Dakota. If you are growing oats this year for grain, be sure to scout and plan a fungicide application to protect the oats from crown rust.
Crown rust of oats is caused by the fungus Puccinia
Crown rust symptoms include small oval-to-oblong shaped, bright orange-yellow pustules which are often observed on the leaves but may also be seen on the leaf sheaths, panicles and stems.
To prevent crown rust from developing on oats, a fungicide application is required. The ideal time for fungicide application is from early flag leaf emergence to flag leaf fully emerged. Because of the heavy inoculum of crown rust on buckthorn, scouting and planning a fungicide application is recommended. If crown rust pustules can be seen on lower leaves at flag leaf emergence, a fungicide treatment is recommended. Several fungicides on
Crown rust can be managed through:
Source: Connie Strunk, South Dakota State University
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