Soybean Rust has been in the States for a number of years, but has never appeared early enough in the season to reach economic threshold. This year is different, and David Gunter, Clemson Extension Feed Grain Specialist based at Edisto REC says four counties in South Carolina have discovered soybean rust:
“Its probably a month earlier than we saw last year. With all the rain that we’ve had, its affected us more than in the past because we are usually so hot. The spores don’t hold up when the temperature is up in the 90s. Its something we will have to watch this year. We have agents sending in leaves and we are looking at it here at the station as well. So far we have had it in four counties, Allendale, Barnwell, Bamburg and Orangeburg.
To scout for rust, farmers will want to look at something that has started to bloom and setting pods. The name rust is well said, but its not exactly like it is on corn. You look on the leaf surface, and maybe use a hand lens to help. They look like little volcanos.
It doesn’t seem to have a preference for location in the field. Its likely on well canopied beans.”
Clemson University Feed Grain Specialist David Gunter.