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28

Monitoring rust on soybean and kudzu in South Carolina in 2006

Presenter: J. D. Mueller

All authors and affiliations: J. D. MUELLER and M. A. Williamson. Clemson University

Sentinel plots were established in 16 South Carolina counties through the cooperation of the local county agents and other Clemson University employees. Counties with sentinel plots included Aiken, Allendale, Anderson, Bamberg, Barnwell, Calhoun, Colleton, Darlington, Florence, Hampton, Horry, Lee, Newberry, Orangeburg, Sumter, and Williamsburg. Additional counties submitted leaves on a regular basis from commercial fields. These included Dorchester and Lexington Counties. Plots consisted of a maturity group IV cultivar, Deltapine 4919 RR, and a maturity group V cultivar, Pioneer 95M50 RR. Plot size varied from site to site with the minimum being eight rows 50-ft long and the maximum being greater than 1 acre. Plots were monitored every other week prior to flowering. After flowering, plots were monitored once a week. On each collection date, 50100 leaves were collected at random from the lower half of the plants by the county agent. Leaves were placed in a Ziploc bag with the corner left partially open and typically mailed to the Edisto R.E.C. After arrival, samples were allowed to incubate 23 days on a table top at room temperature. Twenty-five to fifty leaves were examined under a dissecting microscope at approximately 80 magnification. Asian soybean rust was first identified in South Carolina in the Calhoun County sentinel site on August 17. The next week, Asian soybean rust was identified in the Orangeburg County sentinel site on August 28. Rust was identified from fields in 13 counties in September. Rust was identified from seven more counties in October. The 22 counties with rust in South Carolina in 2006 include Aiken, Allendale, Anderson, Bamberg, Barnwell, Berkeley, Calhoun, Clarendon, Colleton, Darlington, Dorchester, Edgefield, Florence, Hampton, Horry, Lee, Lexington, Newberry, Orangeburg, Pickens, Saluda, and Sumter. Asian soybean rust has also been identified from kudzu in Allendale, Bamberg, Barnwell, Calhoun, and Orangeburg Counties.

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