Barry’s Gleanings: The Herbicide Atrazine

One of the great things about being on vacation is catching up on reading – especially The New Yorker magazines that I never seem to finish.  This article although from February 2014 is pertinent since atrazine is still being used in the U.S.

In The New Yorker, “A Valuable Reputation: After Tyrone Hayes said that a chemical was harmful, its maker pursued him” by Rachel Aviv reports on Hayes’ experiments with the herbicide atrazine, which is applied to more than half the corn in the United States.  After his experiments indicated that the pesticide causes birth deformities (especially in males), Syngenta  tried to discredit Hayes.


Below are excerpts from the article:

“Syngenta, which is based in Basel, sells more than fourteen billion dollars’ worth of seeds and pesticides a year and funds research at some four hundred academic institutions around the world. When Hayes agreed to do experiments for the company (which at that time was part of a larger corporation, Novartis), the students in his lab expressed concern that biotech companies were “buying up universities” and that industry funding would compromise the objectivity of their research. Hayes assured them that his fee, a hundred and twenty-five thousand dollars, would make their lab more rigorous. He could employ more students, buy new equipment, and raise more frogs. Though his lab was well funded, federal support for research was growing increasingly unstable, and, like many academics and administrators, he felt that he should find new sources of revenue. “I went into it as if I were a painter, performing a service,” Hayes told me. “You commissioned it, and I come up with the results, and you do what you want with them. It’s your responsibility, not mine.

Syngenta Headquarters, Basel, Switzerland:



Atrazine is the second most widely used herbicide in the U.S., where sales are estimated at about three hundred million dollars a year. Introduced in 1958, it is cheap to produce and controls a broad range of weeds. (Glyphosate, which is produced by Monsanto, [- which we in Maui know about too much] is the most popular herbicide.)  A study by the Environmental Protection Agency found that without atrazine the national corn yield would fall by six per cent, creating an annual loss of nearly two billion dollars. But the herbicide degrades slowly in soil and often washes into streams and lakes, where it doesn’t readily dissolve. Atrazine is one of the most common contaminants of drinking water; an estimated thirty million Americans are exposed to trace amounts of the chemical. . .[my emphasis].

The E.P.A. approved the continued use of atrazine in October [2004], the same month that the European Commission chose to remove it from the market. [It’s been banned in Italy and Germany since 1991, according to].

The European Union generally takes a precautionary approach to environmental risks, choosing restraint in the face of uncertainty. In the U.S., lingering scientific questions justify delays in regulatory decisions. Since the mid-seventies, the E.P.A. has issued regulations restricting the use of only five industrial chemicals out of more than eighty thousand in the environment [my emphasis]. Industries have a greater role in the American regulatory process—they may sue regulators if there are errors in the scientific record—and cost-benefit analyses are integral to decisions: a monetary value is assigned to disease, impairments, and shortened lives and weighed against the benefits of keeping a chemical in use. Lisa Heinzerling, the senior climate-policy counsel at the E.P.A. in 2009 and the associate administrator of the office of policy in 2009 and 2010, said that cost-benefit models appear “objective and neutral, a way to free ourselves from the chaos of politics.” But the complex algorithms “quietly condone a tremendous amount of risk.” She added that the influence of the Office of Management and Budget, which oversees major regulatory decisions, has deepened in recent years. “A rule will go through years of scientific reviews and cost-benefit analyses, and then at the final stage it doesn’t pass,” she said. . .

To redirect attention to the financial benefits of atrazine, the company paid Don Coursey, a tenured economist at the Harris School of Public Policy, at the University of Chicago, five hundred dollars an hour to study how a ban on the herbicide would affect the economy. In 2006, Syngenta supplied Coursey with data and a “bundle of studies,” and edited his paper, which was labelled as a Harris School Working Paper. (He disclosed that Syngenta had funded it.) After submitting a draft, Coursey had been warned in an e-mail that he needed to work harder to articulate a “clear statement of your conclusions flowing from this analysis.” Coursey later announced his findings at a National Press Club event in Washington and told the audience that there was one “basic takeaway point: a ban on atrazine at the national level will have a devastating, devastating effect upon the U.S. corn economy.”. . .

Hayes was confident that at the next E.P.A. hearing there would be enough evidence to ban atrazine, but in 2010 the agency found that the studies indicating risk to humans were too limited. Two years later, during another review, the E.P.A. determined that atrazine does not affect the sexual development of frogs. By that point, there were seventy-five published studies on the subject, but the E.P.A. excluded the majority of them from consideration, because they did not meet the requirements for quality that the agency had set in 2003. The conclusion was based largely on a set of studies funded by Syngenta and led by Werner Kloas, a professor of endocrinology at Humboldt University, in Berlin. One of the co-authors was Alan Hosmer, a Syngenta scientist whose job, according to a 2004 performance evaluation, included “atrazine defence” and “influencing EPA.”

After the hearing, two of the independent experts who had served on the E.P.A.’s scientific advisory panel, along with fifteen other scientists, wrote a paper (not yet published) complaining that the agency had repeatedly ignored the panel’s recommendations and that it placed “human health and the environment at the mercy of industry.” “The EPA works with industry to set up the methodology for such studies with the outcome often that industry is the only institution that can afford to conduct the research,” they wrote. The Kloas study was the most comprehensive of its kind: its researchers had been scrutinized by an outside auditor, and their raw data turned over to the E.P.A. But the scientists wrote that one set of studies on a single species was “not a sufficient edifice on which to build a regulary assessment.” Citing a paper by Hayes, who had done an analysis of sixteen atrazine studies, they wrote that “the single best predictor of whether or not the herbicide atrazine had a significant effect in a study was the funding source.”

In another paper, in Policy Perspective, Jason Rohr, an ecologist at the University of South Florida, who served on an E.P.A. panel, criticized the “lucrative ‘science for hire’ industry, where scientists are employed to dispute data.” He wrote that a Syngenta-funded review of the atrazine literature had arguably misrepresented more than fifty studies and made a hundred and forty-four inaccurate or misleading statements, of which “96.5% appeared to be beneficial for Syngenta.” Rohr, who has conducted several experiments involving atrazine, said that, at conferences, “I regularly get peppered with questions from Syngenta cronies trying to discount my research. They try to poke holes in the research rather than appreciate the adverse effects of the chemicals.” He said, “I have colleagues whom I’ve tried to recruit, and they’ve told me that they’re not willing to delve into this sort of research, because they don’t want the headache of having to defend their credibility.” . . .

Syngenta denied repeated requests for interviews, but Ann Bryan, its senior manager for external communications, told me in an e-mail that some of the studies I was citing were unreliable or unsound. When I mentioned a recent paper in the American Journal of Medical Genetics, which showed associations between a mother’s exposure to atrazine and the likelihood that her son will have an abnormally small penis, undescended testes, or a deformity of the urethra—defects that have increased in the past several decades—she said that the study had been “reviewed by independent scientists, who found numerous flaws.” She recommended that I speak with the author of the review, David Schwartz, a neuroscientist, who works for Innovative Science Solutions, a consulting firm that specializes in “product defense” and strategies that “give you the power to put your best data forward.” Schwartz told me that epidemiological studies can’t eliminate confounding variables or make claims about causation. “We’ve been incredibly misled by this type of study,” he said.

In 2012, in its settlement of the class-action suits, Syngenta agreed to pay a hundred and five million dollars to reimburse more than a thousand water systems for the cost of filtering atrazine from drinking water, but the company denies all wrongdoing. Bryan told me that “atrazine does not and, in fact, cannot cause adverse health effects at any level that people would ever be exposed to in the real-world environment.” She wrote that she was “troubled by a suggestion that we have ever tried to discredit anyone. Our focus has always been on communicating the science and setting the record straight.” She noted that “virtually every well-known brand, or even well-known issue, has a communications program behind it. Atrazine’s no different.”


Tyrone Haynes

See the whole article at –

How does atrazine compare to glyphosate (Monsanto’s choice)?

Glyphosate (commonly sold as RoundUp) will kill everything. Atrazine will kill much of what it touches but in small amounts.

However, there is hope for the future.

In an update from Sustainable Pulse in a March 24, 2016 article:

“The Environmental Protection Agency will analyze the impacts of atrazine and glyphosate — the two most commonly used pesticides in the United States — on 1,500 endangered plants and animals in the United States under the terms of a settlement reached today with the Center for Biological Diversity. The EPA will also analyze the impacts of propazine and simazine, two pesticides that are chemically similar to atrazine. It has committed to completing the assessments by June 2020” – from

Although the EPA assessment results are years away, we are becoming more aware of the dangers of atrazine and other pesticides thanks to Tyrone Haynes and other scientists who have spoken out for years about the results of their experiments.

Healthy plants grown in healthy ways - at the UGA sustainable farm in Costa Rica

Healthy plants grown in healthy ways – at the UGA sustainable farm in Costa Rica

Learn about the food you buy for your family.  Let’s make good choices.

Aloha, Renée


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About reneeriley

Our blog was begun as a way to share our experiences in China. From August 2010 to July 2011, my husband, Barry Kristel, and I were at our University of Hawaii Maui College sister school, Zhejiang Agriculture and Forestry University in Lin'an, China, a city considered rural because it has only 500,000 people! We had a wonderful time. Then in February 2012, we returned to teach this time at our other sister school, Shanghai Normal University, in a city of over 21 million people. We've made many discoveries. Did you know that now Chinese girls, at least the ones who go to university, for the most part feel they are luckier than the Chinese boys? Did you know that Shanghai saved over 20,000 European Jews during WWII? Do you know how Chinese university students would deal with problems that come up in Dear Abby letters? What's it like to be on the Great Wall of China? Do you know how many Chinese girls had their feet bound and why? And we have recipes from many of the places we've visited. Among others, you can find instructions on how to fry cicadas from one of my ZAFU students and how to make chocolate-Kahlua waffles from my brother Mike in Gainesville. You can also look back to our earliest entry to see what we experienced in Oaxaca, Mexico, in 2006 during the mainly peaceful six months of protest until the Mexican government sent in the troops. Between our stays in China, Barry and I have been on the Mainland U.S. visiting family, friends and Servas hosts as we traveled home to Maui. We share those experiences too. Welcome to our blog! Aloha and Zài Jiàn, Renée and Barry

2 responses to “Barry’s Gleanings: The Herbicide Atrazine”

  1. Rosita says :

    How’s living on Hawaii? Is it a good place to expats live? And how long an expat can stay there? Is criminality a serious problem in Hawaii? Are public services (including schools and hospitals) of good quality on Hawaii?

  2. reneeriley says :

    Hi Rosita: I love living on Maui. In 1985, I moved from Chicago, which is an amazing city where I still have friends, but the winters are seriously terrible. I had a student there who was from Siberia. She said the winters in Chicago are worse than in Siberia! Especially in the winter, many people from Canada and retirees from the Mainland U.S. come to live here. Also surfers from Europe, South America (Brazil, of course), and other young people come here for a season or two. It’s very expensive to live here, so unless you have family or an IT job that pays you well, it’s hard to have a prosperous future here. You are likely to find only minimum wage jobs, so you’ll need two jobs just to pay rent. 😦 However, mainly, it’s safe here. We don’t usually lock the doors of our house, but we do lock our cars when we go to the beach. We have drug arrests. Marijuana is likely to become decriminalized soon. There’s alcoholism, mental illness, drug problems as everywhere, but basically we are a rural community (150,000 people in the three island county of Maui: Molokai, Lanai, and Maui – plus lots of happy, for the most part, tourists). Our public schools have many challenges in part because we have many immigrants from the South Pacific, the Philippines, and other parts of the world where English is not their first language. Our hospitals are challenged too as are most rural areas in the U.S. But Maui is wonderful. Come visit for the ocean, the weather, the Hawaiian people and their loving spirits, and the volcano and rain forests. Aloha, Renée

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