Soybean rust was confirmed Sept. 20 on a soybean sample from Cumberland County, N.C. 

Combined with confirmed finds in Scotland and Cleveland counties in North Carolina and Suffolk County, Va., essentially all the state’s soybeans are within 100 miles of known rust. 

Samples received the week of Sept. 18 from Catawba, Columbus, Gaston, Granville, Hoke, Lincoln, Pasquotank, Robeson, Rutherford, and Wayne counties were all negative for rust.

We would consider that rust spores may well be in any soybean field in the state, but as dry as it is in much of North Carolina, we wouldn’t expect the disease to develop very rapidly. 

We would recommend spraying a fungicide on any soybeans in the state which have started blooming, which do not yet have full sized seeds in the top four nodes of the plant, and which appear to have a yield potential of 20 bushels per acre or more.

Rust has now been confirmed this year on soybeans in 110 counties or parishes in 10 states (Louisiana, Florida, Alabama, Mississippi, Georgia, North Carolina, South Carolina, Arkansas, Tennessee, and Virginia.

Source for more detailed information on soybean rust are the USDA soybean rust website and the North Carolina Agricultural Chemicals manual.