Asian Soybean Rust Shows Up in Southeastern Missouri USDA says the fungus has appeared in Missouri for the first time since 2004. Published on: Oct 18, 2006 Tweet Post to Your Wall. Email Story RSS Permalink Print USDA reported Tuesday that Asian soybean rust is back in Missouri, making an appearance in the southeastern corner of the state. The fungus had been absent in the state in 2005 after appearing in two counties in 2004. According to the USDA, Dr. Allen Wrather made the discovery, finding one soybean rust pustule among 50 soybean leaflets from New Madrid County. The rust has arrived close enough to harvest that the fields should not be impacted, according to a Missouri state rust report. "With frosts in much of the state the end of the week of Oct. 9-13, and harvest moving along rapidly, the possibility of further detections is decreasing rapidly," the report says. In farther north areas such as Missouri, soybean rust shouldn't last long this year, more or less disappearing after the first hard frost. The airborne fungus has also appeared throughout the Southeast, Illinois, and Texas this year. The pathogen has been found in 129 counties this year, compared to 72 by this time last year.