Southern Rust in Corn Is Here Again!

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Don’t forget to assess your crop’s maturity level before spraying a fungicide for rust. If your corn is dented (R5), don’t spray. If it is at R3 or earlier, apply a triazole or strobilurin/triazole combination fungicide. There is no need to spray a strobilurin by itself at this point, since we know the disease is present.

The tougher question is what to do if your corn is at R4 (dough stage). This disease can completely kill a leaf in 5-10 days if conditions are good for it to develop and spread. Corn is getting cheaper, and fungicides are not, so you are going to have to look at your situation to determine if the yield loss at this point is greater than the cost of applying the fungicide. Most of the specialists and printed literature indicate that corn at R4 is probably past the stage of being severely impacted by this disease.
Call me if you want to discuss your situation, or if you need help identifying anything (252-943-5832).

For more information, refer to this publication from Ron Heiniger about Southern Corn Rust in 2015

Written By

Rod Gurganus, N.C. Cooperative ExtensionRod GurganusCounty Extension Director Call Rod Email Rod N.C. Cooperative Extension, Beaufort County Center
Updated on Jul 17, 2015
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