Published June, 2023.

The North Central Regional Committee on Management of Small Grain Diseases (NCERA-184) has developed the following information on fungicide efficacy for control of certain foliar diseases of wheat for use by the grain production industry in the U.S. 

Efficacy ratings for each fungicide listed in the table were determined by field testing the materials over multiple years and locations by the members of the committee. 

Efficacy is based on proper application timing to achieve optimum effectiveness of the fungicide as determined by labeled instructions and overall level of disease in the field at the time of application. Differences in efficacy among fungicide products were determined by direct comparisons among products in field tests and are based on a single application of the labeled rate as listed in the table. Table includes most widely marketed products and is not intended to be a list of all labeled products.

Efficacy of Fungicides for Wheat Disease Control Based on Appropriate Application Timing

A table key and summary can be found below.

Fungicide(s)

Powdery Mildew

Stagonospora Leaf
/ Glume Blotch

Septoria Tritici Blotch

Tan spot

Stripe Rust

Leaf Rust

Stem Rust

Head Scab (4)

Harvest Restriction
Class Active Ingredient Product Rate/A (fl. oz)
Strobilurin Picoxystrobin 22.5% Aproach SC 6.0-12.0 G (1) VG VG (2) VG E (3) VG VG NL Feekes 10.5
Pyraclostrobin 23.6% Headline SC 6.0-9.0 G VG VG (2) E E (3) E G NL Feekes 10.5
Azoxystrobin 22.9%

Quadris 2.08 SC

(6)

 4.0-12.0 (5) G VG (2) VG (2) E E (3) E VG NL Feekes 10.5.4
Triazole Metconazole 8.6% Caramba 0.75 SL 10.0-17.0 VG VG VG VG E E E G 30 days
Tebuconazole 38.7% Folicur 3.6 F (6) 4.0 NL NL NL NL E E E F 30 days
Prothioconazole 41% Proline 480 SC 5.0-5.7 -- VG VG VG VG VG VG G 30 days
Prothioconazole 19%
Tebuconazole 19%		 Prosaro 421 SC 6.5 - 8.2 G VG VG VG E E E G 30 days
Propiconazole 41.8% Tilt 3.6 EC (6) 4.0 VG VG VG VG VG VG VG P Feekes 10.5.4
Metconazole 10.91%
Prothioconazole 18.19%		 Sphaerex 4.0-7.3 VG VG VG VG E E E G 30 days
Mixed Modes of Action (7) Tebuconazole 22.6%
Trifloxystrobin 22.6%		 Absolute Maxx SC 5.0 G VG VG VG VG E VG NL 35 days
Cyproconazole 7.17%
Picoxystrobin 17.94%		 Aproach Prima SC 3.4-6.8 VG VG VG VG E VG -- NR 45 days
Prothioconazole 16.0%
Trifloxystrobin 13.7%		 Delaro 325 SC 8.0 G VG VG VG VG VG VG NL Feekes 10.5,
35 days
Pydiflumetofen 13.7%
Propiconazole 11.4%		 Miravis Ace SE 13.7 VG VG VG VG VG VG VG G Feekes 10.5.4
Fluxapyroxad 2.8%
Pyraclostrobin 18.7%
Propiconazole 11.7%		 Nexicor EC 7.0-13.0 VG VG E E E E VG NL Feekes 10.5
Fluxapyroxad 14.3% Pyraclostrobin 28.6% Priaxor 4.0-8.0 G VG VG E VG VG G NL Feekes 10.5
Prothioconazole 17.39%
Tebuconazole 8.7%
Fluopyram 8.7%		 Prosaro Pro SC 10.3-13.6 G VG VG VG E E E G 30 days
Propiconazole 11.7%
Azoxystrobin 13.5%		 Quilt Xcel 2.2 SE (6) 10.5-14.0 VG VG VG VG E E VG NL Feekes 10.5.4
Prothioconazole 10.8%
Trifloxystrobin 32.3%		 Stratego YLD (9) 4.0 G VG VG VG VG VG VG NL Feekes 10.5, 35 days
Benzovindiflupyr 2.9%
Propiconazole 11.9%
Azoxystrobin 10.5%		 Trivapro SE 9.4-13.7 VG VG VG VG E E VG NL Feeks 10.5.4
Flutriafol 18.63%
Azoxystrobin 25.30%		 Topguard EQ 4.0-7.0 VG NL VG VG E E VG NL Feeks 10.5.4, 30 days

Table Index

  1. Efficacy Categories
    • NL = Not Labeled
    • NR = Not Recommended
    • P = Poor
    • F = Fair
    • G = Good
    • VG = Very Good
    • E = Excellent
    • none = Insufficient data to make statement about efficacy of this product
  2. Product efficacy may be reduced in areas with fungal populations that are resistant to strobilurin fungicides.
  3. Efficacy may be significantly reduced if solo strobilurin products are applied after stripe rust infection has occurred.
  4. Application of products containing strobilurin fungicides may result in elevated levels of the mycotoxin Deoxynivalenol (DON) in grain damaged by head scab.
  5. Label rate for powdery mildew is 7.5-11.0 fl. oz/A.
  6. Multiple generic products containing the same active ingredients also may be labeled in some states.
  7. Products with mixed modes of action generally combine triazole and strobilurin active ingredients. Nexicor, Priaxor and Trivapro include carboxamide active ingredients.
  8. Based on application timing at the beginning of anthesis (Feekes 10.5.1)
  9. Stratego is a product with the same active ingredients as Stratego YLD but a different formulation (11.4% Propiconazole and 11.4% Trifloxystrobin) and higher use rate (10 fl oz/A)

Table Summary

The Efficacy of Fungicides for Wheat Disease Control Based on Appropriate Application Timing table contains data that is arranged in rows and columns. There are 2 primary sections, found in row 1; fungicides and disease types. In row 2, fungicides are broken into class, active ingredient, product, and application rate. Each cell in row 3 and below, when read from left-to-right, describes a fungicide followed by its efficacy results for different small grains diseases and harvest restriction in the final column. An index is provided below the table.

It is the responsibility of the pesticide applicator by law to read and follow all current label directions.

Further information

This information is provided only as a guide. It is the responsibility of the pesticide applicator by law to read and follow all current label directions. Brand names appearing in this publication are for product identification purposes only. No endorsement is intended for products listed, nor is criticism meant for products not listed. Members of NCERA-184 Committee assume no liability resulting from the use of these products. Persons using such product assume responsibility of their use in accordance with current label directions of the manufacturer.

To learn more about fungicides or other management strategies for diseases control in pulse crops, contact MSU Extension specialist Dr. Uta McKelvy. For help with identifying crop disorders, contact your local extension agent or the Schutter Diagnostic Lab at Montana State University.

 

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