The highly contagious soyabean rust disease spread to another county in Alabama and may have crept into Missouri, state and federal officials said on Tuesday.
A single suspected soyabean rust spore was collected in Missouri's Boone County, but the sample is too small for scientists to confirm if the disease is present, said Laura Sweets, a plant pathologist with the University of Missouri.
Separately, the US Agriculture Department said the fungus was found in Alabama's Escambia County, the fourth county in the state to be infected.
The disease was found on a sentinel plot in the R5 growth stage, according to the USDA's rust-monitoring web site.
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