According to USDA's Asian soybean rust (ASR) website, ASR was detected in three Parishes in Louisiana on July 31, and in one county in Alabama and two counties in Mississippi on July 30. So far in 2012, SBR has been reported in 38 counties in the U.S. including Alabama (7), Florida (8), Georgia (10), Louisiana (6), Mississippi (5), Texas (2), as well as 13 reports from Mexico.
"With continued hot, dry weather, new reports of SBR are not expected in the central and northern states, but new reports are expected to continue in the southern states," states USDA.
The most northern detection comes near Rust has identified in Desha County, Arkansas, in a commercial soybean field. "There was an average of five pustules per leaflet and disease incidence was extremely low in this field. Infected leaves were located in the lower canopy and pustules had only a few spores," states the report. "Soybeans were at growth stage R7. It is likely to find other small pockets of SBR in counties that neighbor Desha; however, there is a low risk of disease to develop further due to drought conditions that cover much of the state and forecast for hot, dry weather."