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Soybean rust spores made it to Minnesota Tuesday, January 17, 2006
Agri News staff writer
ST. PAUL -- Soybean rust spores made it to Minnesota, Wisconsin and the Dakotas last summer.
The spores were found in particulate matter analyzed at the cereal disease laboratory at the University of Minnesota, St. Paul.
The particulate matter was collected from 124 sites across the nation that are part of the National Atmospheric Deposition Program, including a site at Lamberton, that dates to January 1979.
The NADP was set up in the 1970s to monitor air pollution from precipitation at 250 sites across the United States, said Les Szabo, aUSDA research geneticist at the cereal disease laboratory. Last year, the NADP paired with USDA's Agricultural Research Service, United Soybean Board and the Minnesota Soybean Research and Promotion Council to rely on the network to gain information on the movement of soybean rust spores.
Szabo found rust spores landed in much of the nation's soybean growing region. Spores were found from North and South Dakota eastward to Pennsylvania and New York. Spores have not been found in samples from Illinois or Iowa.
Two positives were found at Lamberton in southwest Minnesota last summer, Szabo said. One positive occurred the week ending July 26. The second occurred the week ending Aug. 16.
The information was not made public until a meeting of the American Phytopathological Society in mid-November. Szabo said he and the ARS decided not to release the data because they didn't know how to interpret the result. At this point, the research isn't predictive of a soybean rust infection, he said.
It's unknown if the spores were alive when they reached Minnesota or how many spores arrived in the state, Szabo said. The DNA test simply looks for the presence of soybean rust spores.
The test reveals that rust spores can be moved long distances, Szabo said. It also demonstrates that many factors must be in place in order for soybean rust to develop.
Soybean rust spores were not detected in the 30 sentinel plots set up across Minnesota in 2005. The monitoring devices at the sentinel plots are not the same.
On the Web: http://www.plantmanagementnetwork.org/infocenter/topic/soybeanrust/ symposium/program/ |
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