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Detection of Asian soybean rust in South Carolina

Presenter: John D. Mueller, Clemson University
Coauthor(s): Margaret A. Williamson, Clemson University. David S. Howle, Clemson University.

Eleven monitoring plots were established in South Carolina for detection of Asian Soybean Rust (ASR) prior to when it would be detectable in growers fields. Plots consisted of Deltapine 5634 RR and AGS Prichard RR planted on two dates on 95 cm centers in 17-m long rows. Planting dates varied among the counties to account for variability in local planting dates. Target planting dates were 3 weeks prior to the first local planting date and on the first normal local planting date. In addition observations were made on a circa weekly basis from mobile observations, especially in Lee County. Other mobile samples included volunteer soybeans and kudzu patches sampled from May 15 until July 1. Approximately 25 to 30 leaves were collected on a weekly basis from most monitoring plots and sent to either the state Extension Soybean Pathologist or to the Plant Problem Clinic to be examined using a dissecting scope. The first ASR was detected in Hampton County on August 14. This is approximately 2 weeks after it was first observed in Effingham County, Georgia which is located across the Savannah River from Hampton County. Rust was confirmed September 1st in Barnwell County and September 7th in Calhoun County. The extensive drought in South Carolina during September seemed to slow the spread and development of ASR. In October rust was found in Aiken, Allendale, Anderson, Bamberg, Dillon, Darlington, Edgefield, Georgetown, Horry, Lexington, Newberry, Oconee, Orangeburg, Pickens, and Saluda Counties.

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