Soybean Rust Moving Northward

Just a few days ago, Asian soybean rust was confirmed in Illinois, the northernmost sighting this year. That same day marked first-time reports in two other states for 2008.

The Illinois confirmation — in McLean County in the central part of the state — was made on Oct. 23. The other states with first 2008 confirmations that day were Missouri (in Scott County in the east) and Oklahoma (in Bryan County in the southern part of the state). Rust was also reported in McLean County in Kentucky that day.

According to the Illinois report on USDA’s Integrated Pest Management Pest Information Platform for Extension and Education (impPIPE) Web site, “the field was a late-planted double-crop field that was still green. Incidence was low (approximately 3 percent). Two additional confirmations of soybean rust were made on Oct. 25 on soybean leaf samples collected from Jackson and Union counties.” The state had confirmed rust sites in 2006 and 2007, too.

The impPIPE commentary also noted that “since January 2008, soybean rust has been reported in 15 states. This includes 52 counties in Alabama, 32 counties in Arkansas, 33 counties in Georgia, 24 counties in Florida, three counties in Illinois, 27 parishes in Louisiana, three counties in Kentucky, 78 counties in Mississippi, one county in Missouri; five counties in North Carolina, one county in Oklahoma, 16 counties in South Carolina, two counties in Tennessee, five counties in Texas, and four counties in Virginia. Rust was also reported in 10 municipalities (counties) in Mexico. Soybean rust is expected to spread northward until frost.”

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