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Sponsored: Not All Fungicides Are Created Equal

With the official start of summer, many farmers are beginning to consider fungicide applications. For many in northern areas, this may mean an early application while those in southern areas may already be considering options for a fungicide application near tasseling.

Fungicide Mobility

Similar to the way herbicides move within and on plants, fungicides either work through contact or varying degrees of mobility within the plant. As the name states, contact fungicides must directly encounter the fungi to have any effect. Therefore, it is important to get as much coverage as possible when applying these types of fungicides. On the other hand, fungicides that are either locally or upwardly mobile can be taken into the plant and stored in leaf tissues. These types of fungicides can provide a residual effect and prevent some disease infections from occurring in the future.

Fungicide Mode of Action

Like herbicides, fungicides can be classified by their mode of action (MOA). The four most commonly used groups of fungicides in agriculture are groups 1, 3, 7, and 11. The details of each MOA can be found in the Take Action Fungicide Classification chart, which can be downloaded from the Take Action website. Many of the fungicides from group 7 and 11 are best used for proactive or preventative type applications whereas group 1 and 3 fungicides work well for curative applications in response to a present disease. However, there are many fungicide premixes available that have both curative and preventative properties.

Matching Product to Purpose

Knowing the properties of specific fungicides is important when trying to decide what type of fungicide to use for the situation at hand. For example, farmers wanting to make an early-season fungicide application to prevent disease and promote plant health should seek products that have mobility within the plant and can provide some residual defense against pathogens that may arise in the future. In contrast, farmers that have confirmed disease in their field will want to make sure that their fungicide has curative properties to halt current infections and some residual activity to prevent future infections. The chart below highlights the differences between common fungicides.

6.18.18 Fungicide Chart

In instances where disease pressure is very high, it’s usually best to match your fungicide program directly to the target disease for best control. The links below can help you find the most effective products for a specific corn or soybean disease.


Additional Resources

When making the decision to use a fungicide on your operation, always use best management practices and proven integrated pest management strategies. Below are additional resources for specific diseases and product effectiveness for corn and soybeans.





Created and provided by Take Action, the fungicide classification chart below groups fungicides and fungicide premixes by their mode of action to assist in the selection of fungicides. This chart is available to download by visiting the Taken Action website at

6.18.18_Fungicide Classification

What is Take Action?

Take Action is a farmer-focused education platform designed to help farmers manage herbicide, fungicide and insecticide resistance. The goal is to encourage farmers to adopt management practices that lessen the impacts of resistant pests and preserve current and future crop protection technology. 
© 2018 United Soybean Board. Chart Updated 2017


Always contact your trusted advisor with any questions when making fungicide applications decisions.

Austin Scott | Beck’s Field Agronomist and Herbicide Specialist

For more Agronomic News from Austin Scott, Field Agronomist, please visit his blog on

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