dicamba

February 16, 2024

Alarming levels of weed killer found in study of pregnant women

By Johnathan Hettinger and Carey Gillam

Pregnant women in a key US farm state are showing increasing amounts of a toxic weed killer in their urine, a rise that comes alongside climbing use of the chemicals in agriculture, according to a new study published Friday.

The study, led by the Indiana University School of Medicine, showed that 70% of pregnant women tested in Indiana between 2020 and 2022 had an herbicide called dicamba in their urine, up from 28% from a similar analysis for the period 2010-2012 that included women in Indiana, Illinois and Ohio.

Notably, the new study found that along with a larger percentage of women showing the presence of dicamba in their bodies, the concentrations of the weed killing chemical increased more than four-fold.

The study also looked for the presence of 2,4-dichloroacetic acid, better known as 2,4-D, in the urine samples, finding that 100% of the women in both the earlier study and the new one had 2,4-D in their urine, with detectable, but not significant, increases in concentration levels.

The new findings add to a growing body of literature documenting human exposure to chemicals used in agriculture, and various known and potential health impacts. Many scientists have particular concerns about how farm chemicals impact pregnant women and their children, but say more research – and more regulatory scrutiny – is needed.

“These are two chemicals we’re concerned about because of their increasing use,” said Paul Winchester, a neonatal physician in Indianapolis, Indiana, who was not involved in this study but has authored related studies.

Dicamba exposure has been linked to increased risk of liver and bile duct cancer. Some animal studies of 2,4-D exposure during pregnancy found low body weights and changes in behavior in the offspring, while other studies have found that exposure to 2,4-D appears to increase the risk of lymphoma.

February 6, 2024

For a second time, US court bans dicamba weed killers, finds EPA violated law

By Johnathan Hettinger

Dealing a blow to three of the world’s biggest agrochemical companies, a US court this week banned three weed killers widely used in American agriculture, finding that the Environmental Protection Agency (EPA) broke the law in allowing them to be on the market.

The ruling is specific to three dicamba-based weed killers manufactured by Bayer, BASF and Syngenta, which have been blamed for millions of acres of crop damage and harm to endangered species and natural areas across the Midwest and South.

This is the second time a federal court has banned these weed killers since they were introduced for the 2017 growing season. In 2020, the Ninth Circuit Court of Appeals issued its own ban, but months later the Trump administration re-approved the weed killing products, just one week before the presidential election at a press conference in the swing state of Georgia.

But a federal judge in Arizona ruled late Monday that the EPA made a crucial error in re-approving dicamba, finding the agency did not post it for public notice and comment as required by law. US District Judge David Bury wrote in a 47-page ruling that it is a “very serious” violation and that if EPA did do a full analysis, it likely would not have made the same decision.

Bury wrote that the EPA did not allow many people who are deeply impacted by the weed killer – including specialty farmers, conservation groups and more – to comment.

The lawsuit was filed by farmer and conservation groups that said EPA violated two laws in its approval: the Federal Insecticide, Fungicide, and Rodenticide Act and the Endangered Species Act.

EPA spokesman Jeffrey Landis said the agency is still reviewing the ruling but declined to comment further.

“Time and time again, the evidence has shown that dicamba cannot be used without causing massive and unprecedented harm to farms as well as endangering plants and pollinators,” said George Kimbrell, legal director of the Center for Food Safety, which litigated the case.

January 27, 2024

EPA rushed to issue 2020 dicamba approval despite scientific concerns, documents reveal

By Johnathan Hettinger

In December 2021, a small team of scientists working for the US Environmental Protection Agency (EPA) issued a stark report on a controversial weed killer that had been the subject of years of complaints from farmers and environmentalists.

Despite new restrictions, the government scientists confirmed that the damage from the weed killer known as dicamba was nearly impossible to contain; once sprayed onto targeted farm fields where genetically engineered crops were designed to withstand the chemical, dicamba then easily and frequently moved far off target to harm millions of acres of other crops and endangered species. The agency scientists concluded that because of these broad risks, it was doubtful that dicamba, used on tens of millions acres of cotton and soybean crops in the U.S., could legally be kept on the market.

“EPA has reason to believe the number of incidents reported significantly understates the actual number of incidents related to dicamba use,” the agency said at the time.

Despite the public acknowledgements of the problems posed by dicamba, the EPA has taken little action over the last two years to curtail its use. And now, as US farmers prepare for another growing season, dicamba spraying is expected to lead to costly crop damage on farms throughout the US Midwest and southern farming states, just as it has in prior years.

Documents obtained through an ongoing lawsuit against the EPA over its approval of dicamba show that the agency’s lack of action to address the documented harms of dicamba is in sharp contrast to the agency’s rush to renew approval of the chemical in 2020.

And, notably, the documents also show that the EPA’s urgency to grant the 2020 renewal came amid numerous meetings with executives from Bayer, the German company that bought Monsanto in 2018, inheriting Monsanto’s portfolio of weed killing products that included dicamba brands.

April 23, 2022

Guest column: What are pesticides doing to pregnancies? We’re trying to find out.

As we collectively pass what many consider to be two-year anniversary of COVID emergence, the field of clinical research has never been more visible in our day-to-day lives. Published studies on viral mechanisms, promising treatments, and vaccine development, among other COVID-related topics, have dominated media reports since early 2020.

Unfortunately, the laser-like focus on the story of COVID has left other research areas in the shadows, fighting for time, attention, and funding.