Soybean Rust Update
August 18, 2017
from Jim Dunphy, Extension Soybean Crop Scientist,
and Lindsey Thiessen, Extension Soybean Plant Pathologist
NC State University
Asiatic Soybean Rust (ASR) has been confirmed on soybeans in Georgia, Alabama, and Mississippi this week. It was confirmed on soybeans that were at stage R3 (early pod set) in Decatur County, Georgia. And it was confirmed on soybeans that were at stage R5 (early seed development) in Lee and Perry counties, Alabama, and in Lee County, Mississippi. The closest of these finds to North Carolina soybeans is the Lee County, Alabama, find, which is approximately 190 miles from Murphy, 295 miles from Shelby, and 315 miles from Charlotte.
Including detections of ASR on kudzu, the disease has been confirmed to date in 20 counties in Alabama, 4 counties in Florida, 7 counties in Georgia, 9 parishes in Louisiana, and 13 counties in Mississippi.
We recommend spraying a fungicide to prevent infection of ASR on soybeans if ASR is confirmed on soybeans within 100 miles of your field, and the soybeans are between first bloom and stage R5 (early seed development).
The current status of rust in the continental US can be found anytime at http://sbr.ipmpipe.org.