Back in the early 1960s I spent three teenage summers in an intimate relationship with 2,4-Dichlorophenoxyacetic acid. more commonly known as 2,4-D.
Employed by the corporation own a system of irrigation canals in two Northern Colorado counties, my job consisted of sitting on the bumpers of tanker trucks traveling easement roads along canals, hose and spray nozzle in hand, dousing Canadian Thistles with chemical to prevent the plants from flowering and spreading their pesky airborne seeds into the waters of the canals and thence on to farmers’ fields, where they crowd out crops of wheat, maize, and sugar beets.
I and another teenager who held the other hose were assured the chemical was harmless to humans, often sprayed each other to cool off during the frequent hot days of July and August.
2,4D gradually faded from the picture after American agroindustrial giant Monsanto delivered a new weed-killer, Roundup, along with seeds genetically engineered to resist the herbicidal properties of glyphosate, the patented active ingredient in the concoction.
The one-two combination of a potent new weed killer and corporate-owned seeds designed to protect crops from the chemical’s otherwise lethal onslaught made Monsanto king on Big Ag globally [the company was sold to German chemical giant Bayer in 2018].
But resistance to Monsanto’s purported panacea, a combination of concerns over the company’s insistence on barring farmers from using seeds from their harvest to plant next years crops and a forced sale of crops only to dealers authorized by the company along with a growing numbers of research papers challenging the chemical’s safety [which we have covered extensively] has led to a resurgence of that old standby 2.4-D, along with new GMO crops designed to resist it.
But a new study just published raises serious questions about the safety of 2,4-D and the revelation that the bodies of a third of Americans now harbor significant amounts of the chemical, with the most troublesome levels found in the bodies of children and women and child-bearing age.
From George Washington University:
One out of three people in a large survey showed signs of exposure to a pesticide called 2,4-D, according to a study published today by researchers at the George Washington University. This novel research found that human exposure to this chemical has been rising as agricultural use of the chemical has increased, a finding that raises worries about possible health implications.
“Our study suggests human exposures to 2,4-D have gone up significantly and they are predicted to rise even more in the future,” Marlaina Freisthler, a PhD student and researcher at the George Washington University, said. “These findings raise concerns with regard to whether this heavily used weed-killer might cause health problems, especially for young children who are very sensitive to chemical exposures.”
Lead author Freisthler and her colleagues looked for biomarkers of the pesticide found in urine samples from participants in the National Health and Nutrition Examination Survey. They estimated agricultural use of 2,-D by studying public and private pesticide use data from 2001 until 2014.
Out of 14,395 participants in the survey nearly 33 percent had detectable levels of 2,4-D in their urine. The researchers found that participants with urine levels of this pesticide went from a low of 17 percent at the start of the study in 2001-2002 to a high of nearly 40 percent ten years later.
Other key findings of the new study:
▪ As the use of the herbicide increased during the study period so did human exposures.
▪ Children ages 6-11 had more than double the risk of increasing exposure to 2,4-D.
▪ In addition, women of childbearing age had nearly twice the risk of increased exposure compared to men in the same age group.
▪ Human exposures are likely to rise even more in the near future as this herbicide’s use continues to go up.
2,4-D was developed in the 1940s and soon became a popular weed-killer for farmers who wanted to increase crop yields. In addition, homeowners looking for a pristine, green lawn also turned to 2,4-D often in combination with other lawn chemicals.
Exposure to high levels of this chemical has been linked to cancer, reproductive problems, and other health issues. While scientists don’t know what the impact of exposure to lower levels of the herbicide might be, they do know that 2,4-D is an endocrine disruptor and this study shows children and women of childbearing age are at higher risk of exposure.
Children can be exposed if they play barefoot on a lawn treated with the weed-killer or if they put their hands in their mouths after playing outside, where the soil or grass might be contaminated with the chemical. People also can be exposed by eating soybean-based foods and through inhalation. The now widespread use of 2,4-D on GMO soybeans and cotton leads to more 2,4-D moving in the air, which can expose more people to this chemical, according to the researchers.
“Further study must determine how rising exposure to 2,4-D affects human health–especially when exposure occurs early in life,” Melissa Perry, a professor of environmental and occupational health and senior author of the paper, said. “In addition to exposure to this pesticide, children and other vulnerable groups are also increasingly exposed to other pesticides and these chemicals may act synergistically to produce health problems.”
Consumers who want to avoid exposures to pesticide can purchase organically grown food, which is less likely to be grown with weed killers. They can also avoid using 2,4-D or other pesticides on their lawn or garden, the researchers said.
The study, “Association between Increasing Agricultural Use of 2,4-D and Population Biomarkers of Exposure: Findings from the National Health and Nutrition Examination Survey 2001-2014,” was published online in Environmental Health.
Meanwhile, Roundup faces an uncertain fate in Europe, where its use is authorized only until 15 December, pending a further review of the compound’s safety.
And there are signs of troubles ahead, as the Guardian reported 26 November:
Only two out of a group of 11 industry studies given to European regulators in support of the re-approval of the main ingredient in Roundup herbicide are scientifically “reliable”, according to a new analysis of corporate-backed studies on the chemical glyphosate.
<snip>
In a report released on Friday, researchers from the Institute of Cancer Research at the Medical University of Vienna in Austria said their review of a set of safety studies submitted to EU regulators by Bayer AG and a coalition of other chemical companies showed that the vast majority do not meet current international standards for scientific validity.
While two of the corporate studies were considered reliable, six were considered partly reliable and three were not reliable, according to the report.
And as for 2,4-D, it was the one of two primary ingredients in Agent Orange, the notorious compound sprayed over much of South Vietnam to kill crops and the trees used by Viet Cong troops to hide from American air strikes during what folks there now call the American War.
One ailment conclusively linked to Agent Orange exposure is bladder cancer, a malady for which we underwent a surgical removal seven years ago, We can’t but wonder if that affliction stemmed from those cooling spays on hot summer days under the Colorado sun decades before.