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ALERT: Three more SC counties positive for soybean rust; 63 in U.S.
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9/20/2006 11:45 a.m. CDT -- Three more South Carolina counties are positive for soybean rust, bringing that state's total to 13 and the U.S. total to 63. Rust was found in Barnwell, Darlington and Edgefield counties in southwest, south and central South Carolina.
South Carolina now ties for second-place with Florida for most counties with soybean rust in so far 2006. Louisiana took the lead yesterday with 14 parishes positive for rust. There are 43 counties where rust has been found on soybeans; the balance on kudzu, across eight states.
According to today's South Carolina state commentary on www.sbrusa.net, "rust is widespread enough in the state that anyone with soybeans in the R4 to early R5 stage should consider spraying with a fungicide."
The commentary notes that most of the Maturity Group 4 soybeans are being harvested, while most Maturity Group 5 and 6 fields are defoliating. Most of the May planted group 7 and 8 soybeans are past R6. All fields, including double-cropped fields, are at least at R4.
South Carolina officials said, "In the last week, we have identified rust in three new counties in South Carolina. The 13 counties in South Carolina with rust are: Anderson, Barnwell, Calhoun, Colleton, Darlington, Dorchester, Edgefield, Florence, Hampton, Horry, Lee, Orangeburg and Sumter.
"The new find in Barnwell County was in a fungicide test plot at a University experiment station. It was the most severe find to date, with almost half of the leaves infected. Almost half of the infected leaves exhibited more than 250 pustules per leaf.
"The two commercial fields in Edgefield County had low levels of rust. The commercial field in Darlington County was a Maturity Group 4 field that was almost defoliated. Rust was severe on the few leaves present.
"Counties sampled last week in which we could not find rust included: Allendale, Bamberg, Clarendon, Lexington, Newberry and Williamsburg. We will continue to monitor these counties for rust."
Again, in terms of management, the commentary said "Rust is widespread enough in the state that anyone with soybeans in the R4 to early R5 stage should consider spraying with a fungicide. Since rust seems to be established in a wide area, the use of a triazole to help eradicate the rust that is already present is warranted. If controlling foliar and pod & stem diseases is also an objective, the triazole needs to be combined with a strobilurin."
As of midday today, the 63 rust-positive counties in the U.S. are distributed among the eight affected states as follows: Louisiana, 14; Florida and South Carolina, 13 each; Georgia, 11; Alabama, five; Texas, three; Mississippi and North Carolina, two each.
Source: South Carolina state commentary on www.sbrusa.net.
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