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On days too hot for football in the park, kids in our Palo Alto neighborhood in the early 1960s often met at a friend's house where a slip and slide was set up. Imagine exposure levels when kids indulged in slip and slide on a lawn sprayed with 2,4-D by ChemLawn a few days earlier.

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  • A man spraying pesticides California’s Bold Plan to Transform Pest Management Systems is Long on Ambition and Light on Details

    By: Chuck Benbrook, HHRA ED By: Mark Lipson, HHRA Director of Policy and Regulatory Engagement We welcomed the invitation from California’s Department of Pesticide Regulation for members of the public to offer comments and guidance as the State begins to take concrete actions needed to achieve the goals set forth in the new report Sustainable Pest Management: A Roadmap for California. Reviewing the 94-page Roadmap report reminded us how many constituencies, forces, and factors are pushing and pulling farmers, pest managers, and government agencies in multiple directions that are rarely aligned. This Roadmap document describes a very different pest management future that will hopefully become the “de facto” way pests are managed on and off the farm by 2050. If successful by 2050, prevention-based biointensive Integrated Pest Management (bioIPM) will be the norm and there will be minimal if any use of high-risk “Priority Pesticides”. Some thirty-two years ago, DPR hired Chuck Benbrook to carry out a comprehensive evaluation of DPR’s programs and policies to assist in the integration of DPR into the newly-formed Cal-EPA. The resulting report, Challenge and Change: A Progressive Approach to Pesticide Regulation in California, came out in March of 1993. It provides dozens of recommendations intended to do many of the same things that the 2023 Roadmap report hopes to bring within reach. The fact that most pest management systems in California have become more, not less reliant on pesticides over the last 30 years suggests that DPR’s and CDFA’s efforts to achieve Roadmap goals are going to entail heavy lifting, mostly uphill. For this reason in HHRA’s comments, Mark and Chuck describe the nature and substantial scope of changes in laws and policy that will be required to track progress toward Roadmap goals and hopefully, someday, achieve them.

A Father’s Reflections on Football, Dandelions, and Why We Started The Heartland Study

by Charles Benbrook | Jun 4th, 2021
by Charles Benbrook | Jun 4th, 2021
On days too hot for football in the park, kids in our Palo Alto neighborhood in the early 1960s often met at a friend's house where a slip and slide was set up. Imagine exposure levels when kids indulged in slip and slide on a lawn sprayed with 2,4-D by ChemLawn a few days earlier.

My parents moved the family to a kid-centric community in Palo Alto, California as I entered the 6th grade. Through junior high, a favorite way to spend the afternoon in the spring, especially after a day or so of rain, was touch football at the nearby park. The wetter the field the better. Sure, it was hard to hold onto the ball, but it was so much fun when a play ended with two of three kids sliding through a mud hole.

By the end of some games, plays were designed and executed to bring about just that outcome.

Years later, and well after I had become professionally entrapped in the world of pesticide use, risks, and regulation, a single herbicide seemed to always be in the news: 2,4-D. It was one-half of Agent Orange. An impurity in it was the single most toxic chemical known to humankind. The list of adverse public-health consequences caused by it was already a long one. Vietnam veterans regrettably played a starring role in the 1980s and 1990s as the list of confirmed, adverse human health outcomes grew.

Plus, 2,4-D was almost certainly the herbicide of choice in the Palo Alto Parks and Recreation Department when spring rains brought on the prodigious crop of dandelions that blessed our football fields and community lawns every year.

As I learned more about how the human body responds to 2,4-D — itching, acne, and sometimes much worse — I remembered how I would sometimes want to tear off my muddy tee-shirt and hurry home for a shower to wash off my back whatever was setting it afire. And the damn acne…let’s not go there. (Note that there we have much more on the health impacts of 2,4-D in our bibliography).

For years I worried that my youthful exposures to 2,4-D might have a more serious impact on my health or my children’s genes. As I grew older, the first concern faded but I continued to wonder if those football games in the park might have played some role in the genetic roulette that gave rise to my three kids.

From my work with The Heartland Study science team, I now understand that my exposures to 2,4-D likely had little or no impact on my kids. Instead, any impact of 2,4-D on my genes likely came about from 2,4-D exposures experienced by my mother and father, especially exposures around the time I was conceived.

My mother grew up in a Boston suburb and my dad was raised in a heavily agricultural region in Nebraska. So, if 2,4-D or any other agricultural pesticide played a role in making me me, my personal genetic twist of faith likely came from my father.

Today, whenever I pass a soccer or ballfield covered with kids, I wonder if their skin ever burns after sliding though a mudhole in the spring.

I hope that the groundskeeper responsible for the fields children now play on have learned that a few well-timed mowings in the spring work just as well as herbicides in keeping ahead of dandelions and other weeds.

Mowing is not a perfect weed control solution. It requires the burning of fossil fuel and disrupts the peace and quiet on Saturday afternoons. But before we know it, all the mowers next door will be electric and will go round and round in near silence.

Then, finally, that burning sensation after a spirited spring soccer or football game, or barefoot frisbee with the dog will become nothing more than a distant memory, and that will be progress.


HHRA is developing protocols to help determine whether, to what extent, and how today’s rising levels of exposure to 2,4-D and other herbicides are contributing to reproductive problems and adverse birth outcomes. Connecting dots that might link contemporary 2,4-D exposures to adverse birth outcomes triggered from the dad’s side of the reproductive equation is why The Heartland Study invites all fathers-to-be to enroll in the dad’s side of our project.

For more on herbicide-induced male reproductive concerns:

The recently released book Countdown by our friend Dr. Shawna Swann traces forty years of science and insights on how a father’s DNA can impact birth outcomes. Key discoveries on sperm quality and health have been made over the years by scientists conducting studies on 2,4-D, and many are featured prominently throughout the book.

A Heartland Study Co-PI, Dr. Melissa Perry, did her doctoral research on sperm quality and has conducted several important studies on the topic. Learn more about her work in this profile, or enter “Perry” in the HHRA bibliography search engine. A search using the keyword “2,4-D” will provide easy access to around 50 published papers, including most of the important ones on 2,4-D and sperm quality that are discussed in Countdown.



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