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NC soybean rust update
Story Date: 9/20/2013
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Source: Jim Dunphy, Extension soybean specialist, and Steve Koenning, extension plant pathologist, NCSU, 9/19/13
Asiatic Soybean Rust was confirmed earlier today on a soybean sample from Cumberland County, NC. Combined with the confirmed finds in Scotland and Cleveland counties, NC, and Suffolk County, VA, essentially all the state’s soybeans are within 100 miles of known rust. Samples received this week 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 the state, 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 Bu/A or more.
Rust has now been confirmed this year on soybeans in 110 counties or parishes in ten states (LA, FL, AL, MS, GA, NC, SC, AR, TN, & VA).
Some sources for more detailed information on Asiatic soybean rust are listed below:
The USDA soybean rust web site http://www.sbrusa.net/
The North Carolina Agricultural Chemical Manual http://ipm.ncsu.edu/agchem/agchem.html
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