Prosaro West


Where Quality Meets Quantity

Registered on wheat and barley, Prosaro® fungicide provides the best defense against the broadest spectrum of leaf and head diseases including unsurpassed protection from fusarium head blight (FHB). With two different fungicide active ingredients (tebuconozole and prothioconazole), Prosaro has long-lasting preventative and curative properties to quickly eliminate existing infections and prevent new ones from developing. The result is a healthier, more productive, higher yielding cereal crop. Prosaro has consistently shown a positive return on investment by protecting the yield and quality of your crop.


See localized demonstration strip trial (DST) results online to see the positive impact a proactive fungicide application can make to your operation: nine consecutive years of grower-cooperated field trial data proving the consistent yield, quality and ROI benefits of fungicides.

Application Tips

800 mL/ha. (324 mL/ac.)


Crops/Application Timing
Barley For optimum protection against fusarium head blight without compromising leaf disease control, apply as a preventative spray when 70 to 100% of the barley main stem heads are fully emerged to three days after full head emergence.
Wheat For optimum protection against fusarium head blight without compromising leaf disease control, apply as a preventative spray when at least 75% of the wheat heads on the main stem are fully emerged to when 50% of the heads on the main stem are in flower.


Timing Guide

If planning on applying one fungicide application per year and flag leaf disease levels are low to moderate Bayer recommends waiting to apply a fungicide at the head timing, protecting against various head diseases including FHB, leaf diseases and subsequently maximizing both quality and quantity of your yield.

Targeting the middle stage (shown below) will most often deliver the best results, but Bayer research has indicated that even if you apply slightly earlier or later, a positive ROI is still observed. Remember, an application at head timing can supply both flag leaf protection and the added benefit of head protection throughout the grain fill period.

Prosaro Head Timing Trials

Prosaro Head Timing Trials

Source: 11 Bayer grower co-operated Wheat DSTs (2012-2013 and 2016). numbers expressed as gain in yield vs. the untreated check. Your results may vary according to agronomic, environmental and pest pressure variables.

  • 6.5 L jug = 20 acres (2 X 6.5 L jug = 40 acres)
  • 104 L bulk shuttle = 320 acres


Water Volume
  • Ground – minimum of 10 US gal./ac. (38 L/ac.)
  • Aerial – minimum of 5 US gal./ac. (19 L/ac.)


  • One hour after application


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As one of the only companies who can offer a complete lineup of cereal protection products and program savings, Bayer allows you to harness the full potential of your crop. Learn more


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