Menu

Utilize a Fungicide For Crown Rust Prevention in Oats

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.

Causes
Crown rust of oats is caused by the fungus Puccinia coronata var. avenae. Unlike stripe, stem, and leaf rust which must blow up from the southern states (because they are unable to overwinter here), crown rust overwinters in South Dakota on buckthorn. Crown rust typically appears on buckthorn three to four weeks before infection is observed on oats. The fungus which causes crown rust in oats is specific to cultivated oats, wild oats, and a few other grasses. Crown rust does not infect wheat, barley, or rye. Wet, warm, and cloudy weather and long dew periods promote crown rust infection. Hot and dry weather halts crown rust development.

Symptoms
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.

Prevention
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 market are effective against crown rust.

Management
Crown rust can be managed through:

  • Growing resistant cultivars. Some cultivars have good resistance or have tolerance to crown rust.
  • Planting oats early in spring, this may help plants escape infection, which typically happens to late plant spring oats.
  • If possible and practical, uproot/destroy any buckthorns in the nearby area. Eradicating local source of inoculum may help delay infection keeping in mind that crown rust spores may travel (be blown) from long distances.

Source: Connie Strunk, South Dakota State University 

Recent News

Stretch Limited Hay Supplies
12/12/2019

Although growing conditions for hay production were favorable throughout much of North Dakota this year, challenges associated with harvest and transport have left many livestock producers facing a shortage of hay. North Dakota State University Extension agents from across the state have reported that 10% to 30% of this year’s forage crop is unavailable (that […]

USMCA on Course for Ratification in 2020
12/11/2019

Natalie Andrews, William Mauldin and Anthony Harrup reported yesterday at The Wall Street Journal Online that, “A new U.S. trade deal with Mexico and Canada gained backing from House Democrats, setting the agreement on course for likely ratification by Congress in 2020 and marking a victory for President Trump after months of negotiations to modify it. “Mr. Trump ran for office in 2016 […]

Soybean Price Prospects Moving into 2020
12/10/2019

The two major drivers of uncertainty impacting soybean prices in 2019 appear set to carry over into 2020.  The status of trade negotiations with China continues to move soybean markets despite numerous fits and starts in the process. Another USDA estimate of the 2019 soybean crop comes out in January.  Without supportive information on either […]

Your browser is out-of-date!

Update your browser to view this website correctly. Update my browser now