Southern Rust Alert for NC Corn Growers
Southern Rust has been found in Swan Quarter as well as Lenior County at the Pioneer Research Station.
If your corn is dented (R5) don’t spray. Most specialists say at if your corn is at R4 it is more than likely past the stage of being severely impacted by Southern Rust. If your corn is at R3 or earlier, you need to apply a triazole or a strobilurin/triazole combination fungicide. See this recommendation guide sheet from Ron Heiniger: Southern Rust in Corn, 2015
If you need help identifying Southern Rust call Andrea Gibbs at 252-926-4488 or 252-542-9300
From Dr. Ron Heiniger:
We are seeing another early outbreak of Southern Rust in corn in North Carolina in 2015. We went through this last year. Only good news is that this is at least a week later than the outbreak in 2015. As you know from last year the fight against Southern Rust is a race between the rust infecting most of the leaves of corn before R5 and the crop reaching the R5 stage with the leaves clean. I have attached an updated recommendation guide sheet. Use this to discuss what growers need to do to protect their crop. What we saw last year was the disease was not as agressive as it was in prior years and that early treatments slowed the spread considerably (one grower documented a 40 bu per acre advantage from a fungicide application at first sign of the disease). I hope this is the case again this year.
So far we have found Southern Rust in two fields. One in Lenior County at the Pioneer Research Station and another in Hyde County. Unfortunately, these fields are in the middle of the eastern part of the state and this tells me that most likely we have some more fields that have Southern Rust in the Tidewater and Coastal Plain that just aren’t scouted as often and therefore the disease has gone unnoticed.