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30

Sentinel plot monitoring and comparison of Asian soybean rust (ASR) development in Georgia in 2005 and 2006

Presenter: L. E. Sconyers

All authors and affiliations: L. E. SCONYERS (1), R. C. Kemerait, Jr. (1), D. V. Phillips (2), and P. H. Jost (3). (1) Department of Plant Pathology, University of Georgia, Tifton, GA; (2) Department of Plant Pathology, University of Georgia, Griffin, GA; and (3) Dow AgroSciences, NC

In 2006, 10 kudzu and 14 soybean sentinel plots were established for monitoring the development of Asian soybean rust (ASR). For each soybean plot, maturity groups IV and VI were planted on one planting date ranging from the second to the third week of April. Weekly, ASR 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 24 plots in 2006, ASR developed in five kudzu plots and eight soybean plots, while in 2005, ASR developed in one of five kudzu and 14 of 17 soybean plots. Based upon sentinel plots and samples submitted from grower fields in Georgia, it appears that ASR was moving north at an estimated 50 miles per week in 2006 and 60 miles per week in 2005. By October 31, ASR was confirmed in 15 counties in 2006 and in 31 counties in 2005. ASR development in 2006 may have been slowed due to a calm hurricane season and a severe drought that resulted in a 5- to 22-inch deviation from the 20-year rainfall average. From these results, it is clear that prevailing weather conditions significantly impact ASR development, and sentinel plots will need to continue to be monitored in order to understand the epidemiology of this disease.

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