Seminole Crop E News

Agricultural News for Farmers and Agribusiness in SW Georgia

Corn – Southern Rust in the Area 2015

Posted by romeethredge on June 8, 2015

There has been some southern rust found in Mitchell county Georgia by County Agent Andy Shirley. It’s now also been found inTerrell County, by Agent Nick McGhee.

Here’s a photo from last year when we had a bad problem with it in our corn fields.


Here are comments from Dr. Bob Kemerait, UGA Plant Pathologist.  “Corn growers in south Georgia should be very much aware NOW that rust is here. 

Current weather patterns increase the risk. 

I believe that any irrigated field corn with good yield expectations and that is at tassel or beyond is a good candidate for treating with a fungicide.

 Corn approaching tassel is also certainly at risk.”

Here are some comments from Dr. Dewey Lee, UGA Grains Scientist.

“Even though this southern rust infection is earlier than usual, most of our corn crop is a little head of schedule.  While this might not be much comfort, it does mean we might have saved at least one spraying.  Last year, it was extremely difficult to stay a head of southern rust because the infectious time was longer than normal due to favorable conditions for infection.  Some corn in the southern areas of the state is as far along as the R3/R4 stage.  This makes it easier to control rust and reduce the impact since it is much closer to maturity.  Much of the corn crop though, is silking to early ear development (R2/R3) which adds roughly 2 to 3 weeks of time to our potential spraying.

If you have good yield potential (and most irrigated growers do), I would consider spraying a combination of fungicides to provide both a curative and preventative type of action.  There are great choices today from lots of sources.  You may not have a current infection taking place, but spores are active and an application of a combination of fungicides will be great insurance and likely prevent yield loss.  As long as southern rust is active, I would consider staying on a 14 day spray schedule or shorter.  This disease can certainly undermine all your efforts this year and significantly reduce corn yields.”

Link to Dewey’s Blog.

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