UW
Soybean Plant Health
Managing Soybean Rust in Wisconsin
Asian Soybean Rust
| Latest Information |
| About Rust |
| Identifying Rust |
| Scouting |
| Rust Disease Cycle |
| Risk Assessment |
| Agronomic Impact |
| Management |
| Fungicides |
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Starting points for rust management |
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Rust is a potentially threatening disease, but it can be managed!
Variety selection
Currently there are no known varieties which are resistant to soybean rust in the Midwest. However, it is likely that varieties will vary in their susceptibility. There are indications that early maturity varieties for a geographic region will escape some degree of the yield-limiting effects of soybean rust. However, early maturity varieties generally have lower potential compared to full-season varieties.
Cultural practices
Early planting may allow plants to reach advanced growth stages before the arrival of rust inoculum. Other cultural control practices like wider row width and reduced plant populations may reduce the length of time that leaves remain wet and potentially decrease the severity of rust. However, it is not known how big of an impact these methods may have, if at all.
The impact of all diseases should be considered before changes in cultural practices are made with the goal of rust suppression. For example, early planting increases the potential of white mold throughout Wisconsin, and for yield-limiting levels of Bean pod mottle virus due to intense bean beetle activity in early-planted soybean fields.
Fungicides
Fungicides are the only in-season pest management practice that is effective against soybean rust. Several fungicides are registered for soybean rust and more are likely to be granted Section 18 emergency use labels in the future...read more about fungicides»
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Resources
Soybean Rust Management in Wisconsin (pdf file)
A two-page bulletin with guidelines and a decision tree for rust fungicide use. Published by the UW Nutrient and Pest Management program, UW Integrated Pest Management, and UW-Extension.
Avoid a tank tri-mix on soybeans (pdf file)
Roundup Ready soybeans, the soybean aphid, and the potential for soybean rust has increased growers' interest in combining all pesticide products into a single spray application. While convenient, these tank mixtures are not recommended.
Soybean Rust in South Dakota
Good overview of soybean rust (pdf)
Information from this site can be copied and distributed for educational use. Please credit the source with our name and URL: University of Wisconsin-Madison, Departments of Agronomy, Entomology, and Plant Pathology at www.plantpath.wisc.edu/soyhealth.