Cooperative Extension University of Wisconsin-Extension

Issues in Agriculture

Extension Responds - Soybean Rust

Soybean Rust, a potentially devastating fungal disease, was found in Louisiana in  November 2004. This was the first report of the disease in the continental U.S. The disease is spread by the wind. Given the right weather conditions next spring or summer, it could blow up to Wisconsin from Louisiana in only a few days. That means Wisconsin growers will need to be prepared for this possibility during the 2006 growing season.

Most recent update:  April 2006

What are the prospects for a Soybean Rust invasion in summer 2006?  Researchers who addressed the National Soybean Rust Symposium last November reviewed last year's efforts to monitor for the fungal disease and made their best forecasts for the coming growing season.  You can find the proceedings at here on the web.  Of special interest; the presentations in "Session Three: Looking Towards 2006."

As of July 26, Wisconsin still appears free of Soybean Rust. UW-Extension staff continue to monitor.

You can get the latest news and guidelines about crop insurance for Soybean Rust from the USDA-Risk Management Agency.

Here’s a summary of current Risk Management Agency Guidelines. (PDF)

And here’s a worksheet you could use for documentation. (PDF)

University of Wisconsin and USDA are on the look-out for soybean rust. Producers and crop consultants can get the latest information about and movement of this disease at

  • 1-866-RUST411 This toll-free hotline is updated daily by the UW Plant Disease Diagnostic Lab.
  • USDA hosts this Web site. It is a clearing house for information from all the soybean rust sentinel plots in the U.S.

If soybean rust should come to Wisconsin, here's a "ready reference" list of fungicides that are available for use on Soybean Rust here.

It may seem convenient to mix pesticides to make a single spray application to control soybean aphids and rust, but Extension soybean experts do not recommend doing it (PDF).

UW-Madison/Extension plant pathologist Craig Grau summarizes information and recommendations for managing soybean rust. (PDF).

Proper fungicide timing will be key to maintaining profitability for the coming years. Plant pathologists from many regions of the U.S prepared Using Foliar Fungicides to Manage Soybean Rust.

Soybean Teleconference discussing Management Principles for Soybean Rust in Wisconsin.

PowerPoint presentations from the teleconference:


If your soybean crop is infected with soybean rust, will crop insurance cover your loss? The Risk Management Agency of USDA issued a statement on this question on December 30.

Several other plant diseases look a lot like soybean rust. How can you tell the difference? (6.39MB PDF)

University of Wisconsin-Extension’s grains team members say Wisconsin growers will need to be vigilant in scouting for Soybean Rust in 2005.

What’s the prospect for Soybean Rust in Wisconsin fields in 2005?

This Pest Alert fact sheet includes photographs of an infected soybean plant.

Here’s how to submit a soybean plant sample for testing. (142K PDF)

Here’s information about Soybean Rust Fungicide Best Practices.

Review the Soybean Rust information on the APHIS (Animal and Plant Health Inspection Service) website.

You can learn more about Soybean Rust from