FROM: John Mueller, Extension Soybean Pathologist, Edisto Research and Education Center
We have another late season rust find in South Carolina.
Hannah Mikell, Clarendon County Agronomic Row Crop Agent, found a field in Clarendon County last Friday, the 21st, that had 15/50 leaves with rust. Most of the leaves had very low levels of infection but 3 leaves had about 10% of the leaf surface affected by rust and 1 leaf had almost 25% of its surface area affected by rust.
SOYBEAN RUST HAS NOW BEEN FOUND IN ALLENDALE, COLLETON, BAMBERG, BARNWELL, CALHOUN, CLARENDON, DORCHESTER, FLORENCE, HAMPTON, NEWBERRY AND ORANGEBURG COUNTIES.
Counties that have been surveyed but no rust found now include: Anderson, Dillon, Darlington, Horry, Jasper, Lee, Marion, Richland, Saluda and Sumter Counties.
At this point there are very few, if any, fields that are at a stage young enough to warrant a fungicide spray. We should not expect to see any yield response from rust in the vast majority of our fields.
If you would like an update on the occurrence of soybean rust across the United States check out http://sbr.ipmpipe.org .