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Using Foliar Fungicides To Manage Soybean Rust
Soybean rust, a disease that causes serious crop losses in many parts of the world, was first detected in the continental United States in November 2004. Soybean rust is caused by the fungus Phakopsora pachyrhizi. Long known to occur in Asia, the fungus spread to Zimbabwe, South Africa; Paraguay; Brazil; Colombia; and now the United States during the last 10 years. Yield losses in other parts of the world due to soybean rust have been reported to range from 10 to 90 percent.
Annual yield losses for North American soybean production are predicted to be at least 10 percent in the upper Midwest, Northeast, and Canada, and 50 percent or greater in the Mississippi Delta and southeastern states. However, losses in hard-hit areas anywhere in North America could exceed 80 percent if effective management tactics are not deployed.
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