UW Soybean Plant Health
| Latest Information |
| About Rust |
| Identifying Rust |
| Scouting |
| Rust Disease Cycle |
| Risk Assessment |
| Agronomic Impact |
| Management |
| Fungicides |
Fungicides for Soybean Rust Available in Wisconsin
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| Protectants or preventative fungicides provide a barrier between the leaf and the rust spore, preventing spore germination and infection. A protective fungicide was applied in the center of this leaf. | |
The chlorothalonil (Bravo, Echo 720) and strobilurin (Headline, Quadris) groups of fungicides work preventatively.
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Curative fungicides inhibit the development of the disease after infection. A curative fungicide was applied on the bottom leaf, but not on the upper leaves in this photo. |
Choosing a fungicide: protectant or curative?
Fungicides of all types will provide greater control if applied before rust spores are deposited soybean leaves. Once rust symptoms are visible, fungicides with protectant activity will not be effective, and curative types will have limited activity. Early detection and proper identification of soybean rust will be key to successful management of soybean rust. Read more on timing fungicide applications.
The popular, full-color 50-page publication called Using Foliar Fungicides to Manage Soybean Rust has been recently updated for 2008. It covers the factors involved in making fungicide spray decisions, choosing fungicides, and strategies for fungicide application, with numerous illustrations, tables, and charts. View online in pdf format»
Available fungicides
The fungicides listed in Table 1 have full registrations (Section 3) in Wisconsin for use on soybeans to control soybean rust. Products that were approved under Section 18 for soybean and have expired as of November 10, 2007 are listed in Table 2.
Table 1. Fungicides currently labeled for soybeans in Wisconsin (Section 3). Most of these fungicides are protectants; they work by inhibiting spore germination.
| Trade Name | Active Ingredient |
Chemical Group |
Other soybean diseases controlled |
Preharvest Interval |
|---|---|---|---|---|
| Bravo® Weather Stik (Syngenta) |
chlorothalonil |
chloronitrile |
Anthracnose, Cercospora leaf blight, Diaporthe pod and stem blight, Frogeye leaf spot, purple seed stain, Septoria brown spot,, stem canker | 6 weeks |
| Echo 720®, Echo 90 DF, Echo Zn (Sipcam Agro) |
chlorothalonil |
chloronitrile |
Anthracnose, Cercospora leaf blight, Diaporthe pod and stem blight, Frogeye leaf spot, purple seed stain, , Septoria brown spot , stem canker | 42 days |
| Headline® (BASF) | pyraclostrobin |
strobilurin |
Alternaria leaf spot, Anthracnose, brown spot, Cercospora leaf blight, Frogeye leaf spot, Pod and stem blight, Rhizoctonia aerial blight, Southern blight (suppression only) | 21 days |
| Quadris® (Syngenta) | azoxystrobin |
strobilurin |
Alternaria leaf spot, Anthracnose, Cercospora leaf blight, Septoria brown spot, frogeye leaf spot, Pod and stem blight | 14 days |
| Stratego (Bayer Crop Science) |
propiconazole, trifloxystrobin |
triazole and strobilurin |
curative and protectant |
Do not apply later than growth stage R5 |
Preventative + Curative |
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| Domark 230 ME (Isaro S.p.A.) |
tetraconazole |
triazole |
protectant and curative |
Do not apply later than growth stage R5 |
| Quilt (Syngenta) |
azoxystrobin, propiconazole |
strobulirin and trizole |
protectant and curative |
Do not apply later than growth stage R5 |
| Tilt (Syngenta) |
propiconazole |
triazole |
curative and protectant |
Do not apply later than growth stage R5 |
Table 2. Current products that were approved under Section 18 for soybean and have expired as of November 10, 2007. If you have any unopened canisters of material for products under the Section 18 label, they should be returned to the distributor and not used on soybean. The return requirement is only if the application of the fungicide was for soybean, as these fungicides may be used on other approved crops.
| Trade Name | Active Ingredient |
Chemical Group |
Activity |
Preharvest Interval |
|---|---|---|---|---|
| Bumper EC (Makhtshim Aga of North America) |
propiconazole |
triazole |
curative |
Do not apply later than growth stage R5 |
| Folicur (Bayer Crop Science) |
tebuconazole |
triazole |
curative and protectant |
30 days |
| Headline SBR (BASF) |
pyraclostrobin, tebuconazole |
strobulirin and trizole |
curative and protectant |
30 days |
| Laredo EC, EW (Dow AgroSciences) |
myclobutanil |
triazole |
protectant and curative |
28 days |
PropiMax |
propiconazole |
triazole |
curative |
Do not apply later than growth stage R5 |
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.
last update 2/28/08