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A soybean rust monitoring network in South Dakota in 2005.

Presenter: M.A. Draper, Plant Science Department, South Dakota State University, Brookings, SD
Coauthor(s): B.E. Ruden, Plant Science Department, South Dakota State University, Brookings, SD

The soybean rust monitoring network in South Dakota for 2005 consisted of 40 sentinel plots, including 37 soybean, two dry pea and one snap bean plot. Thirty-six of the 40 plots were located on producer farms, and with the exception of two plots, were located within existing commercial production fields. Five plots were irrigated and row spacing varied from drilled row spacing to 96 cm. Plots sites were chosen to provide a relatively uniform distribution across the soybean growing areas, with each soybean plot representing approximately 110,000 planted soybean acres within the state. Eighteen Extension Service Agronomy Educators, trained as First Detectors, monitored the sentinel plots on a weekly basis from the first week in July through September 1. Disease and crop development data, hourly temperature and humidity readings and rainfall were recorded at each site. Brown spot was seen at all locations, with very low to moderate severity. In higher rainfall areas, bacterial blight reached moderate levels throughout the canopy. Bacterial pustule was confirmed in SD for the first time and was found, late in the season, at three sentinel plots widely separated from each other. The exercise provided for very positive interaction among producers, extension educators, commodity group, and agricultural industry representatives. Despite soybean rust not being detected in the state in 2005, the foundation has been established for long term cooperation.

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