Issue 22
June 1999 		Uniform fungicide trials point to treatment benefits

Some products perform better than others

By Tracy Sayler
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Prairie Grains is the official publication of
the Minnesota
Association of
Wheat Growers,
North Dakota Grain Growers Association,
South Dakota Wheat, Inc., and the Minnesota Barley Growers Association.

 A uniform fungicide evaluation study involving multiple states indicated that some products are better than others for suppressing scab, DON (vomitoxin, a contaminant produced by scab) and fungal leaf diseases. All of the products in the study, however, were effective in reducing wheat diseases to some degree, when applied once, at flowering.

The study conducted last year involved researchers in seven states: North Dakota, South Dakota, Minnesota, Missouri, Ohio, Indiana, and Kentucky. The federally-funded study will be expanded to 14 states this year.

Top Responses with Fungicides in HRSW--ND,SD,MN - 1998

In the 1998 study, only ND, SD, and MN had severe enough levels of scab to evaluate fungicide treatments. Various leaf diseases (such as Septoria, tan spot, and leaf rust) were present in all trials, however, allowing evaluation of fungicide products on these leaf diseases in the seven-state uniform study.

Tilt, Folicur, Benlate+ Mancozeb, Quadris (a new product) and Quadris +Benlate were evaluated against untreated check plots. In the ND, MN, and SD trials, Tilt reduced scab an average of 30.6%, with a scab reduction range of 17.8-59.1%. The average and range for other products: Folicur, 50.4% (29.6-65.1% range) Benlate+Mancozeb 41.3% (19-65.1% range) Quadris 35.8% (4.7-72.7% range) and Quadris+Benlate 43.9% (8.9-73.2% range).

Average percentage yield response from each product used for scab suppression: Tilt, 8.1%; Folicur, 13.1%; Benlate+ Mancozeb, 10.1%; Quadris, 15.6%; Quadris+Benlate, 14.2%. Average percentage DON reduction over two ND trials, one MN trial and one IN trial: Tilt, 27.4%; Folicur, 60.1%; Benlate +Mancozeb, 45.7%; Quadris, 34.8%, and Quadris+Benlate, 42.7%.

Average % Reduction in Scab in HRSW in ND, SD, & MN - 1998

Average percentage decrease (and range) in leaf diseases from the products in the seven-state study: Tilt, 63% (26.9-96.1%) Folicur, 64.2% (38.4-80.3%) Benlate+Mancozeb, 36.8% (3.8-65.1%) Quadris, 67.6 (38.4-99.2%) and Quadris+Benlate, 68.6% (29.4-99.2%).

Producers should bear in mind that product efficacy may be affected by several variables, including application rate, nozzle type, water volume, and application timing. For a research update on some of these variables, article "NDSU research yields more clues for improving fungicide application techniques" in the table of contents.
Copyright Prairie Grains
Magazine
June 1999