Source: Jim Dunphy Extension Soybean Specialist, Steve Koenning Extension Plant Pathologist NCSU, 8/8/13
Asiatic Soybean Rust was confirmed yesterday in South Carolina commercial soybean fields in Orangeburg County, and at the Edisto Research Station near Blackville, SC. Soybean rust has also been identified in Desha County, Arkansas, two new counties in Georgia, four new counties in Alabama, and two new counties in Mississippi. This puts rust closer yet to all our soybeans in North Carolina except those in the far western part of the state, but still not close enough to warrant a recommendation from us to spray for the disease. The closest confirmed rust on soybeans to our North Carolina soybeans is now approximately 120 miles from Charlotte, 325 miles from Elizabeth City, 155 miles from Fayetteville, 115 miles from Murphy, 205 miles from Raleigh, 260 miles from Washington, 175 miles from Wilmington, and 185 miles from Winston-Salem, NC. (The mileages in red are changes from our previous update.)
Rust has now been confirmed this year on soybeans in 28 counties/parishes in seven states (AR, AL, FL, GA, LA, MS & SC).
We have received sentinel plot samples this week in the PDIC from Bertie, Johnston, Lenoir, and Scotland counties. Soybean rust was not detected in any sample. Rust has progressed at a much faster rate this year than in years past. With a late soybean crop, the odds of needing to apply fungicides is increased. Now is the time to check spray equipment and be sure to have the proper nozzles for applying fungicides. You may also want to locate sources of fungicides.
We do not recommend spraying soybeans that have not started blooming with a fungicide to control Asiatic soybean rust. Once soybeans start blooming, we would recommend spraying if rust has been confirmed within 100 miles of the field, and if the soybeans do not yet have full sized beans in the top four nodes of the plants.
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