What is Prosaro® fungicide?

Prosaro fungicide is a combination of two active ingredients, each of which has a proven track record of performance against cereal diseases. Prosaro helps maximize yield and improve grain quality, increasing profit potential via broad-spectrum disease control in wheat and barley, arresting both leaf and head diseases.

How does Prosaro work?

  • Prosaro® fungicide inhibits the ability of fungi to produce important components of cell membranes, leading to cell disruption and eventual death of the pathogen.
  • Prosaro provides broad-spectrum disease control to help maximize yield and improve grain quality in wheat and barley, protecting crops from both head and leaf diseases and increasing profit potential.
  • Prosaro stops the penetration of the pathogen into the plant and stops the spread of infection within the plant. As a result, Prosaro inhibits the reproduction and further growth of fungus.

What diseases does Prosaro control?

Prosaro controls most major leaf and head diseases, including:

- Fusarium head blight (scab)
- Leaf, stem and stripe rusts
- Septoria leaf spot
- Glume blotch
- Tan spot
- Powdery mildew

- Fusarium head blight (scab) - suppression
- Net blotch
- Powdery mildew
- Rusts
- Spot blotch

How do scab and DON levels affect wheat?

DON is a mycotoxin that can be produced in wheat and barley grain infected by scab. Also known as Fusarium head blight, scab may infect grain heads when moist conditions occur during the flowering and grain-filling stages of plant development.

Wheat and barley that have been infected with scab will still produce grain, but the grain may be small, lightweight and discolored. They also risk the chance of carrying unacceptable levels of the DON mycotoxin. This means they may not be acceptable for purchase. Prosaro fungicide can help protect wheat and barley grain from the damaging effects of scab and DON.

What are acceptable DON thresholds?

The federal government provides guidelines for acceptable DON threshold levels in wheat. Millers may pay a premium for high-quality grain with low DON levels, as they face restrictions on how lower-quality wheat can be consumed. As DON levels increase, there are fewer options for which the wheat can be used, and millers pay less for such grain. In extreme cases, they may not accept the grain at all.

The following table illustrates federal guidelines on how wheat can be used, based on the presence of DON as measured in parts per million.

How does Prosaro help increase profitability?

Prosaro® fungicide can help protect wheat and barley grain from the damaging effects of scab and DON. This results in higher yields and improved grain quality, which translates into profits for the grower.

Learn more about maximizing profitability in wheat.

How is Prosaro different than strobilurin chemistry?

Strobilurins applied after flag leaf emergence may allow DON levels to increase. Prosaro, on the other hand, controls scab, which lowers levels of DON.

Prosaro, a fungicide with two active ingredients, can control all the diseases controlled by strobilurin chemistries with the added benefit of helping to manage DON levels.

Why should I believe Prosaro works?

Prosaro has been rigorously tested in the United States and abroad. It is the most-used product in the United States for scab protection, and it is the standard scab fungicide in European countries where it is registered for use.

When should Prosaro be applied?

The best conditions for wheat and barley growth and yield potential are also ripe for disease development – that is, warm, humid weather.

Apply Prosaro at the optimal timing for wheat-early flowering (Feekes growth stage 10.51) and before scab symptoms are visible-for the best performance.

Optimal Prosaro application timing for barley is at head emergence. The broad-spectrum activity of Prosaro will protect the flag leaf, while holding back head diseases.

Even when scab is not present, Prosaro does an excellent job protecting against all other major leaf and grain head diseases.

Prosaro® is rainfast within two hours of application or until fully dry on the leaf surface.

What should I do in the face of early disease pressure?

There are situations in which the pressure of various diseases-such as powdery mildew and stripe rust-becomes apparent early in the season-before the crop reaches flag leaf stage. Fusarium head blight, or scab, is not yet a threat to grain quality in these early stages. In this situation, growers can make an early season application of Stratego® YLD fungicide, followed by an application of Prosaro at flag leaf stage or later.

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