Dicamba—a name that sparks fierce debate across American agriculture—has once again landed at the center of a legal and environmental storm. The Environmental Protection Agency’s decision to re-register dicamba-based herbicides for over-the-top (OTT) use on genetically engineered cotton and soybeans has triggered a new lawsuit, igniting questions about crop protection, regulatory oversight, and the very future of weed management in the U.S. Short answer: The EPA’s recent re-registration of dicamba herbicides, now more permissive than past approvals, has reignited major controversy and legal action due to the chemical’s well-documented tendency to drift off target, causing widespread crop and ecological damage. The lawsuit, brought by farm and environmental groups, argues that the agency ignored both scientific evidence and prior court rulings, and that the new labels weaken protections, potentially exacerbating conflicts between farmers and risking further harm to endangered species, pollinators, and rural communities.
Let’s unpack the history, the science, the regulatory twists, and what’s at stake for farmers and the environment.
The Evolution of Dicamba Use and the Drift Crisis
Dicamba has been used in U.S. agriculture since the 1960s, but for decades was primarily applied as a preemergent, before crops sprouted, to control tough broadleaf weeds (nationalaglawcenter.org). Its volatility—the tendency to evaporate and move off target—made it risky to use during the growing season. That changed dramatically in 2016, when the EPA approved new “low-volatility” dicamba formulations for spraying directly over genetically engineered, dicamba-tolerant soybeans and cotton. This shift promised farmers a powerful tool against herbicide-resistant weeds like Palmer amaranth, but it came with an enormous catch: “dicamba’s drift has damaged millions of acres of farmland and caused devastating damage to orchards, vegetable farms, home gardens, native plants, trees and wildlife refuges across the country,” as summarized by biologicaldiversity.org.
The scale of this drift damage is staggering. The U.S. Department of Agriculture estimated that up to 15 million acres of soybeans were affected by dicamba drift in just one year, 2018 (biologicaldiversity.org, panna.org). Beyond soybeans, the herbicide has harmed orchards, vegetables, and wild habitats, with the damage described by experts as “the worst of any pesticide in the history of U.S. agriculture.” Arkansas’ largest beekeeper was forced to move his operation out of state after dicamba decimated flowering plants essential for his bees, leading to “sharp drops in honey production” (panna.org, biologicaldiversity.org). These ripple effects underscore dicamba’s volatility and the difficulty of containing it, even with improved formulations.
Court Battles, Regulatory Whiplash, and the New Lawsuit
The legal saga around dicamba is nearly as volatile as the chemical itself. Since its 2016 approval for OTT use, dicamba’s registration has been challenged in court four times, with federal courts vacating EPA approvals in both 2020 and 2024 (dtnpf.com, nationalaglawcenter.org, cen.acs.org). In 2020, the Ninth Circuit Court of Appeals found that the EPA had failed to consider how “dicamba use would tear the social fabric of farming communities,” highlighting the social rifts created when some farmers’ use of dicamba damaged their neighbors’ crops (biologicaldiversity.org, panna.org). Yet, just months after these rulings, the EPA granted new registrations—each time making adjustments to the label restrictions but, according to critics, not solving the core problem.
The most recent re-registration, finalized in February 2026, is now facing a legal challenge from a coalition including the National Family Farm Coalition, Center for Biological Diversity, Center for Food Safety, and Pesticide Action & Agroecology Network (farms.com, dtnpf.com, cen.acs.org). The lawsuit claims the EPA violated both the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and the Endangered Species Act by approving the herbicide without adequate consideration of drift damage, stakeholder input, or endangered species protections.
Weaker Restrictions, Stronger Backlash
A central flashpoint in the current debate is that, despite EPA Administrator Lee Zeldin’s assurances of “the strongest protections in agency history,” the new dicamba labels are “in many ways more permissive than past approvals” (cen.acs.org). Previous labels limited spraying to early in the growing season, with a cutoff date of June 12 for soybeans, and required a 100-foot buffer to protect endangered species habitats (biologicaldiversity.org, panna.org). The new approval eliminates both the cutoff date and the buffer, allowing for spraying later into the summer—when higher temperatures increase the risk of volatility and drift (dtnpf.com).
Instead of date-based restrictions, the new labels use temperature-based limits: applications are prohibited when air temperatures reach 95 degrees Fahrenheit, and a maximum of two applications per season is allowed, with a total of one pound of dicamba acid equivalent per acre (dtnpf.com, dtnpf.com). They also require drift-reduction agents, pH-buffering additives, and a 240-foot downwind buffer, but critics argue these mitigations are insufficient. As the Center for Food Safety’s George Kimbrell put it, “EPA’s re-registration of dicamba flies in the face of a decade of damning evidence, real world farming know-how and sound science, and, oh-by-the-way, the law” (farms.com, biologicaldiversity.org).
The EPA’s own human health risk assessment reportedly found “no human health or dietary risks of concern,” but acknowledged “ecological risks” and justified the new label restrictions as balancing those risks with farmers’ need for weed control tools (dtnpf.com). The agency’s approach has been described as aiming for “more flexibility in application timing than crop growth stage and calendar date restrictions implemented for previously registered OTT dicamba products” (dtnpf.com). For many growers, especially those battling herbicide-resistant weeds, dicamba remains a critical tool. But for their neighbors and for conservationists, the risks of drift and collateral damage are too great.
Farmers, Communities, and the “Social Fabric” of Agriculture
One of the most profound, if less visible, consequences of the dicamba saga has been its impact on rural communities. Dicamba drift doesn’t just damage crops; it “pits farmer against farmer,” as Iowa grower Rob Faux explains (panna.org). When one farmer’s use of dicamba destroys another’s livelihood, it breeds resentment and distrust, sometimes forcing affected farmers out of business altogether. The courts have acknowledged this, with the 2020 ruling specifically noting that EPA failed to consider how OTT dicamba “would tear the social fabric of farming communities” (biologicaldiversity.org, panna.org).
This social impact is not hypothetical. Thousands of drift complaints have been filed across the Midwest and South, and the issue has become a flashpoint in local politics and farm organizations. In many cases, even farmers who rely on dicamba for weed control worry about the long-term viability of a system that results in neighbors suing neighbors over crop losses and property damage (dtnpf.com, nationalaglawcenter.org).
Endangered Species, Pollinators, and Environmental Risks
The ecological implications of dicamba drift are also severe. Beyond crops, dicamba damages a wide variety of sensitive plants, including those in wild areas and refuges (biologicaldiversity.org, panna.org). Dozens of threatened species, such as monarch butterflies and the rusty patched bumblebee, face additional risks when their habitats are exposed to dicamba. The loss of flowering plants reduces food sources for pollinators, contributing to declines in bee populations and, in one dramatic case, forcing Arkansas’ largest beekeeper to relocate (biologicaldiversity.org, panna.org).
The new label’s removal of the 100-foot buffer to protect endangered species habitats has drawn particular ire from environmental groups, who argue that this “substantially loosens previously weak restrictions” and increases the risk to already imperiled wildlife (cen.acs.org, panna.org).
Regulatory Process, Conflicts of Interest, and Public Trust
A recurring criticism of the EPA’s handling of dicamba involves transparency and conflicts of interest. A 2021 Inspector General’s report found that the original approval of dicamba “excluded important scientific evidence,” and current critics point to the role of officials with prior industry ties, such as former American Soybean Association lobbyist Kyle Kunkler, in the approval process (biologicaldiversity.org, panna.org). The agency has also been faulted for failing to hold adequate public comment periods and for not consulting drift victims or a broad range of stakeholders before re-registering the product (nationalaglawcenter.org, biologicaldiversity.org).
These procedural issues have contributed to a perception among some farmers, scientists, and environmental advocates that the EPA is prioritizing corporate interests over public and environmental health. The lawsuit’s core argument is that the agency has “ignored court rulings, scientific evidence and the interests of growers harmed by chemical drift” (farms.com).
Industry and Grower Perspectives
Not all voices are critical. Industry groups like the American Soybean Association and companies such as Bayer and BASF maintain that dicamba is “a critical crop-protection tool for soybean farmers, particularly in managing herbicide-resistant weeds like Palmer amaranth” (dtnpf.com). They argue that the EPA’s scientific assessments are robust and that new mitigation measures—especially the use of low-volatility formulations and drift-reduction technologies—will reduce off-target impacts. These groups also highlight the economic risks of weed infestations and the need for a diverse toolbox to sustain crop yields and food supply.
However, even some grower groups express concern about the effectiveness of mitigation measures and the potential for renewed legal uncertainty. The back-and-forth of court rulings and label changes has made planning difficult for farmers, who need predictable regulations to make crop management decisions (dtnpf.com, nationalaglawcenter.org).
What’s Next: Legal, Agricultural, and Environmental Uncertainty
The outcome of this latest lawsuit will shape the future of weed management and regulatory policy in U.S. agriculture. If the court finds that the EPA has again failed to meet its statutory obligations, another vacatur of dicamba registrations could follow, potentially leaving farmers scrambling for alternatives. If the registration stands, the risk of continued drift damage, community conflict, and ecological harm remains high.
In sum, the EPA’s re-registration of dicamba-based herbicides “marks the latest chapter in a years-long dispute” (farms.com), with profound implications for American farming, rural communities, and the environment. At stake are not only the technical details of pesticide labels and application windows, but fundamental questions about how society balances agricultural productivity, environmental stewardship, and the health of rural communities. The next steps—both in the courts and in the fields—will determine whether the lessons of the past decade lead to a safer, more sustainable agricultural future, or to further cycles of conflict and damage.