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Chlorothalonil ban on the radar

David Jordan is not anticipating a ban by the EU of U.S. peanuts where chlorothalonil was applied, but farmers need to be prepared.

John Hart

September 27, 2022

3 Min Read
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North Carolina State University Extension Peanut Specialist David Jordan discusses research examining alternatives to the fungicide chlorothalonil during the 70th Annual Peanut Field Day at the Peanut Belt Research Station in Lewiston-Woodville. John Hart

The European Union has banned the use of the fungicide chlorothalonil due to environmental concerns surrounding the compound. This is something U.S. peanut farmers need to keep on their radar since chlorothalonil is a vital product for controlling diseases and the European Union is an important export market for U.S. peanuts.

The European Union’s Standing Committee on Plants, Animals, Food and Feed called for the ban of chlorothalonil due to serious environmental concerns, such as risks to fish and amphibians and concerns about groundwater contamination. The ban on the use of chlorothalonil in the EU began in 2020.

As of now, the EU is not banning imports of peanuts from the United States and other countries that use chlorothalonil. But North Carolina State University Extension Peanut Specialist David Jordan says that could change and U.S. peanut farmers need to be prepared and aware.

Jordan emphasizes that he is not anticipating a ban by the EU of U.S. peanuts where chlorothalonil was applied, but he cautions it could happen and we need to be prepared. “There’s always the chance that they’re going to say we are not going to bring any peanuts into our marketplace that have been treated with chlorothalonil,” Jordan said at the 70th annual Peanut Field Day Sept. 8 at the Peanut Belt Research Station in Lewiston-Woodville, N.C.

Jordan said the challenge for the U.S. peanut industry is that shellers are not able to segregate peanuts that have been treated with chlorothalonil with those where the compound has not been applied.

Jordan emphasized that “Bravo” — or chlorothalonil — is a safe compound that serves a vital role in peanut production. “We’ve had that fungicide around for decades and decades. It’s really served us well. It’s the most popular fungicide we spray. There are also numerous generics for it,” he said.

Jordan said a big advantage of chlorothalonil is that it is strong from a resistance management standpoint. He said it offers excellent control of such diseases as leaf spot in various fungicide programs.

“We often apply it as our first and last spray, and it can be effective within sprays three through five when applied with mixed with a stem rot (white mold) fungicide. It is only a protectant and stays on the leaf surface. Other fungicides can be more effective because they move into the leaves and are more uniformly distributed, but chlorothalonil is important for leaf spot control. We do need to be careful under hot and dry conditions because it can flare mites,” he explained.

To prepare for the possible loss of chlorothalonil, North Carolina State is conducting research on disease control options in the absence of chlorothalonil. Jordan and his team are evaluating 10 different peanut varieties (both runners and Virginia-types) with five different fungicide programs for each of the varieties. The study is replicated four times with 200 plots in one experiment.

“Some of our fungicide programs in the study are pretty standard programs. One thing I’m really concerned about and really interested in is making sure we get some solutions if we were to lose chlorothalonil,” Jordan said.

In addition to standard fungicide programs, Jordan and his team are evaluating a sulfur product that’s available in the market and comparing it to the use pattern for chlorothalonil. The idea is to see how well the product works when part of a fungicide program. So far, Jordan said the sulfur product is not as efficacious as chlorothalonil.

“It might be good enough if you start looking for the worse-case scenario,” Jordan said.

Jordan noted a key aim of the research project is to see which of the 10 varieties in the project face the greatest risk with a less than ideal fungicide program

About the Author(s)

John Hart

Associate Editor, Southeast Farm Press

John Hart is associate editor of Southeast Farm Press, responsible for coverage in the Carolinas and Virginia. He is based in Raleigh, N.C.

Prior to joining Southeast Farm Press, John was director of news services for the American Farm Bureau Federation in Washington, D.C. He also has experience as an energy journalist. For nine years, John was the owner, editor and publisher of The Rice World, a monthly publication serving the U.S. rice industry.  John also worked in public relations for the USA Rice Council in Houston, Texas and the Cotton Board in Memphis, Tenn. He also has experience as a farm and general assignments reporter for the Monroe, La. News-Star.

John is a native of Lake Charles, La. and is a  graduate of the LSU School of Journalism in Baton Rouge.  At LSU, he served on the staff of The Daily Reveille.

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