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Pest Alert: Soybean Rust

Click the following image to view a soybean rust scouting video: Soybean Rust: Scout Before You Spray.
Please note: if you are using a wireless internet connection you may have a problem viewing the video due to a possible firewall issue. Please download and read this troubleshooting document (Adobe PDF, 52kb) for further instructions.

Soybean Rust Pest Information Platform for Extension and Education

Download the IPM Center Soybean Rust Pest Alert (Adobe PDF, 232 kb)

Download the Hi-Resolution version of the IPM Center Soybean Rust Pest Alert (suitable for poster printing) (Adobe PDF, 5.8 MB)

Alerta Nacional de Plagas: La Roya de la Soya (PDF, 240 kb)

Soybean rust is a serious disease causing crop losses in other parts of the world. It has not yet been detected in the continental United States, but the fact that it is principally spread by wind-borne spores indicates it may eventually reach major soybean growing areas in this country. Soybean rust is caused by two fungal species, Phakopsora pachyrhizi, an aggressive pathogen, and Phakopsora meibomiae, a weak pathogen. P. pachyrhizi has spread in the past ten years to Zimbabwe, South Africa, Paraguay, and Brazil causing severe damage. Yield losses have been reported from 10-80%. APHIS listed P. pachyrhizi in the Federal Register on August 12, 2002, as one of nine agents or toxins potentially posing a severe threat to plant health or plant products in the U.S. The appearance of a new pathogen on a key U.S. commodity raises a whole series of questions. Farmers want to know if it poses a direct threat, not only for the crop in the year it appears, but also for the future. The arrival of P. pachrhizi to the United States soybean production areas is anticipated and could cause large crop and economic losses to growers. Resistant varieties are still in development, but there are effective fungicides being used in other countries. It is not currently known which of the fungicides, current registrations and future registration, may be effective on soybean rust in the U.S. Growers, Extension personnel, researchers, etc., also need to know how to identify soybean rust so rapid detection can occur.

Visit the USDA APHIS soybean rust page for more details.

Sample Citations

Kuchler,F., Duffy, R.,Shrum, R., and Dowler, W. 1984. Potential economic consequences of the entry of an exotic fungal pest: The case of soybean rust. Phytopathology 74(8):916-920.

Yang, X. B., Dowler, W. M. and Royer, M. H. 1991. Assessing the risk and potential impact of an exotic plant disease. Plant Disease 75(10):976-982.

Yang, X. B., Tschanz, A. T., Dlowler, W. M. and Wang, T. C. 1991. Development of yield loss models in relation to reduction of components of soybean infected with Phakopsora pachyrhizi. Phytopathology 81:1420-1426.

Duffy, R. Control of exotic pests: Forecasting economic impacts. USDA/ERS Agricultural Economic Report #518. August 1984.

Strategic Plan to Minimize the Impact of the Introduction and Establishment of Soybean Rust (Phakopsora pachyrhizi, P. meibomiae) on Soybean Production in the United States. USDA/APHIS/PPQ. September 2002.

Other Links

Return to Soybean Rust main page