The information and recommendations in this newsletter are applicable to North Carolina and may not apply in other areas.
The information and recommendations in this newsletter are applicable to North Carolina and may not apply in other areas.
From: Jim Dunphy and Steve Koenning, Extension Crop Science and Plant Pathology Specialists
Asiatic soybean rust was confirmed today on samples from sentinel plots in Bertie and Washington counties in North Carolina. Johnston and Robeson counties were announced earlier this week as having a sample on which rust was detected. In all four cases, only one leaf of the many inspected had any rust pustules. Samples from the sentinel plots in Carteret, Columbus, Edgecombe, Granville, New Hanover, Union and Wayne counties were all negative for soybean rust this week. Rust was also found Tuesday, September 29, at the research station near Suffolk, Virginia, about 15 miles north of Gates County, North Carolina. Rust has now been confirmed on soybeans in Alabama, Arkansas, Florida, Georgia, Indiana, Kentucky, Louisiana, Oklahoma, Missouri, Mississippi, North Carolina, South Carolina, Tennessee, and Virginia.
It is considered likely that rust spores are present in many if not all of our North Carolina counties. Since so few pustules were detected on any of the samples inspected to date, and since the four counties with confirmed rust are so scattered across the state, it is also considered likely that the spores probably have not been here for very many weeks. Under ideal growing conditions for the rust (wet conditions with moderate temperatures) it will probably take four weeks or so for rust to develop enough to cause much economic damage. Under less than ideal growing conditions, it will typically take a little longer. Most, but not all, of our state’s soybeans will be mature and safe from damage from rust by then.
North Carolina soybean farmers should continue to check their soybeans that have not yet gotten full sized beans in the top of the plants, and to continue to monitor reliable reports of where else rust has been found. An up-to-date map of where rust has been found is at http://www.sbrusa.net. The current version of these North Carolina updates should also be available at our Teletip line at 800/662-7301.
Employment and program opportunities are offered to all people regardless of race, color, national origin, sex, age or disability. North Carolina State University, North Carolina A&T State University, U.S. Department of Agriculture, and local governments cooperating.
Last modified on October 2, 2009 by Stephen J. Toth, Jr.