A field with tar spot on the leaves of branches that show the damage that tar spot has done to healthy branches

Taking action to help tackle tar spot.

We invest billions in research and development to advance plant genetics and develop a portfolio of fungicides so that farmers can take the mystery out of tar spot and protect their crops.

Tar Spot Resources for Today and the Future

What is tar spot? Take the mystery out of this disease.

Our latest solution: Delaro® Complete fungicide.

Learn about our latest assays.


Working to Advance Tar Spot Tolerance

As farmers fight tar spot in their fields, the Crop Science division of Bayer is taking action in research and development. The capacity to induce this disease in both the lab and field environments helps to accelerate the screening and identification of tolerant corn germplasm. And the potential to integrate native tar spot tolerance into North American products will be a game changer for farmers.

Hear the Latest on Tar Spot Advancements

Researchers from the Crop Science division of Bayer have been able to artificially inoculate tar spot in two new assays; which will help us advance tar spot tolerance so that farmers can better combat this threat.


Tar Spot Tracker

Confirmed Counties With Tar Spot (2018-2023)

Tar Spot is Spreading

Tracking the spread of tar spot is key to getting ahead of this disease. See the latest data to find out if it’s in your area or could be soon.

A map of the united states that shows where Tar Spot has been active

Tar Spot Management Tips

Scouting, weather monitoring and fungicide applications are some of the steps you can take today to help tackle tar spot.

1 - ScoutingBegin scouting fields for foliar disease symptoms just before tasseling and continue through the grain filling stages of growth. Rapid grain filling occurs from R2 (blister) to late R5 (full dent).
2 - ApplicationA properly timed foliar fungicide application may greatly improve overall plant health and help to protect yield potential.
3 - PreventionFungicides typically work better at preventing rather than curing disease.
Get More Tar Spot Advice

Delaro® Complete Fungicide

This innovative fungicide provides consistent disease control, higher yield potential and improved plant health. Learn more about Delaro® Complete fungicide.

Close up image of a tractor working in a field to spray delaro complete and protect crops to increase yield

Know the Basics Behind Tar Spot

Tar spot is a fungal disease that is relatively new to the United States. It was first discovered in 2015 in the Midwest, but it has quickly spread across the Corn Belt in the past few years.


The Cutting-Edge Solutions Farmers Need Today.

Bayer is committed to providing the latest varieties that meet the needs of farmers so they can tackle their challenges head-on.

Channel® Seed
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DEKALB® Seed
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A channel field corn seed back and a dekalb fungicide seed bag

Additional Resources

Spotlight

The recently developed Tarspotter model may help farmers predict the risk of tar spot being present in a cornfield.

Spotlight

Hear Technical Agronomist Jim Donnelly's take on tar spot in Northern Illinois.

Spotlight

Watch a time-lapse video of how tar spot can spread on a corn plant.

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Disclaimer

Always read and follow pesticide label directions, insect resistance management requirements (where applicable), and grain marketing and all other stewardship practices.

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