No. 6 Article 7/May 2, 2008

Soybean Rust Update and Monitoring Efforts

Soybean rust was identified recently on coral bean (aka Cherokee beanErythrina herbacea) in Florida. Coral bean, an ornamental plant, has never before been reported as a host for the soybean rust fungus. For more information about coral bean, go to www.floridata.com/ref/E/erythrin.cfm.

Currently, active soybean rust has been reported on kudzu in one Texas county and six Florida counties. Other states in the southern U.S. are monitoring for soybean rust but have not confirmed any active infestations recently.

Illinois will monitor for soybean rust in the 2008 season using approximately 40 "sentinel plots" across the state. The soybean rust sentinel plot program, a multistate effort, was established in 2005. Support for the Illinois sentinel plots has come from the Illinois Soybean Association, the Illinois Department of Agriculture, the North Central Soybean Research Program, and the United States Department of Agriculture (USDA). Participants include extension and research personnel with the University of Illinois and research personnel with Southern Illinois University and the USDA Agricultural Research Service.

During the growing season, weekly state commentary is written based on information from the sentinel plots. The state commentaries are available online at the soybean rust ipmPIPE Web site (www.sbrusa.net). The state commentaries include information about soybean rust and other soybean diseases that are present in the state. Soybean rust observations in North America (from Mexico to Canada) are available at the same site. A nearly real-time map shows where soybean rust is present in North America. This site is extremely important in monitoring where soybean rust is in the U.S., and it should be checked regularly, especially when the soybean crop is approaching the reproductive stages.--Carl A. Bradley

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