SOUTH CAROLINA SOYBEAN RUST NEWS NOTE
14 August 2021
FROM: Jonathan Croft, Clemson Extension Agronomic Agent, Joe Varn, Clemson Extension
Agronomic Agent, and Dr. John Mueller, Extension Soybean Pathologist, Edisto Research
and Education Center.
SOYBEAN RUST HAS NOT BEEN DETECTED IN SOUTH CAROLINA AS OF 14 August
2021.
During the week of August 8th – August 14th samples were examined from Allendale,
Barnwell, Dorchester, and Orangeburg Counties. Growth stages of the soybeans
sampled ranged from R3 to R5.
On July 28th, Asian Soybean Rust (ASR) was identified on soybean in Burke County, Ga. ASR was
identified in soybean sentinel plots in Midville, Ga. The soybeans in this sentinel plot are in
the R6 growth stage. This is the closest find of ASR on soybean to SC currently. Midville, Ga is
approximately 40 miles from the South Carolina border. The referenced location of ASR can be
found on the reporting map at https://www.eddmaps.org/distribution/uscounty.cfm?sub=9298.
Note the advanced growth stage, R6, in the field reporting rust in Georgia. Most of the
soybeans in South Carolina are still in much earlier growth stages. We rarely see rust
before R3 in an individual field.
Again, at this time ASR has NOT been identified in SC. With the current rainfall and tropical
storm predictions. Growers in SC should consider a fungicide application to high yield
potential soybeans that are not already in the R5 growth stage.
For specific fungicide recommendations please consult the Clemson Pest Management
Handbook https://www.clemson.edu/extension/agronomy/pestmanagement21/2021pmhsoybeandi
seasecontrol.pdf or call your local Clemson Extension Agent.
