Fungicide efficacy for control of wheat diseases

Diane Brown-Rytlewski, Michigan State University Extension, Department of Plant Pathology - April 26, 2007

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

The North Central Regional Committee on Management of Small Grain Diseases 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 United States. Efficacy ratings for each fungicide listed in the following 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.

Efficacy of fungicides for wheat disease control based on appropriate application timing

duct	Fungicide(s)	Rate/A (fl. oz)	Powdery mildew	Stagonospora leaf/glume blotch	Septoria leaf blotch	Stripe rust	Leaf rust	Head scab
Headline 2.09 EC	Pyraclostrobin 23.6%	6.0 to 9.0	G1	VG	VG	E2	E	NR
PropiMax 3.6 EC	Propiconazole* 41.8%	4.0	VG	VG	VG	VG	VG	F
Quadris 2.08 SC	Azoxystrobin 22.9%	6.2 to 10.8	F(G)3	VG	VG	E2	E	NR
Quilt 200SC	Azoxystrobin 7.0% Propiconazole 11.7%	14.0	VG	VG	VG	VG	VG	NR
Stratego 250 EC	Propiconazole 11.4% Trifloxystrobin 11.4%	10.0	G	VG	VG	VG	G	NR
Tilt 3.6 EC	Propiconazole* 41.8%	4.0	VG*	VG	VG	VG	VG	F
Folicur 3.6 EC4	Tebuconazole* 38.7%	4.0	G	VG	VG	E	E	G

1 Efficacy categories: NR=Not Recommended; F=Fair; G=Good; VG=Very Good; E=Excellent
2 Efficacy may be significantly reduced if solo strobilurin products are applied after infection has occurred
3 (G) indicates greater efficacy at higher application rates.
4 Folicur does not have a federal label, but may have Section 18 emergency registration in some states (including Michigan).
*There may be other generic propiconazole and tebuconazole products available (check with your supplier).
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. No endorsement is intended for products listed, nor is criticism meant for products not listed. Members of NCERA-184 assume no liability resulting from the use of these products.

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