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Sentinel plot monitoring and management of Asian soybean rust in Georgia in 2005.

Presenter: L. E. Sconyers, Department of Plant Pathology, University of Georgia
Coauthor(s): R. C. Kemerait, Department of Plant Pathology, University of Georgia. D. V. Phillips, Department of Plant Pathology, University of Georgia. P. H. Jost, Department of Crop and Soil Science, University of Georgia.

In 2005, 3 clover, 5 kudzu and 17 soybean sentinel plots were established for monitoring the development of Asian soybean rust. For each soybean sentinel plot, maturity groups II, III and IV were planted on one planting date ranging from the first to the third week of April. On a weekly basis, rust severity (low, moderate or heavy), incidence (number of leaflets infected out of 100 leaflets collected at random), and growth stage were recorded for soybean sentinels. Of the 25 plots, rust developed in 1 kudzu plot and 13 soybean plots, while no rust developed in clover plots. Rust initially developed in discrete foci within a sentinel plot and was typically identified first in the lower canopy. The disease then moved upward within the canopy and to adjacent soybean plants within approximately 7-10 days. Based upon sentinel plots and samples submitted from grower fields, it appears that the disease was moving north at an estimated 60 miles per week. By 31 Oct, soybean rust was confirmed in 31 counties. Replicated trials were conducted at multiple sites around the state to evaluate the efficacy of different fungicides and the importance of timing of application in the control of soybean rust. Fungicides that were evaluated in these studies included strobilurins, triazoles, benzimidazoles, chlorothalonil, and various other products. From preliminary results, it is clear that growers in Georgia can effectively manage Asian soybean rust when using appropriate fungicides that are applied ahead of or very early in the epidemic.

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