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Daily News Blog

18
Mar

Research Highlights Regulatory Failures in Addressing Risks to Nontarget Organisms from Rodenticides

(Beyond Pesticides, March 18, 2025) The November 2024 press release by the U.S. Environmental Protection Agency (EPA) for its Rodenticide Strategy includes the final biological evaluation (BE) of 11 rodenticides. Prior to the finalization of the BE, Beyond Pesticides commented to EPA’s Office of Pesticide Programs in early 2024, disagreeing with the categorical no effect (NE) determinations for all freshwater and marine fish, aquatic mammals, aquatic amphibians, aquatic reptiles, and aquatic invertebrates. (See related Daily News and Action of the Week.) The latest scientific literature highlights the impacts of rodenticides on nontarget organisms, including aquatic organisms that the agency failed to evaluate due to harm that was, as EPA says, “not reasonably certain to occur.” Many rodenticides, intended to target rats, mice, squirrels, nutria, and more, are anticoagulants and stop normal blood clotting. Active ingredients in these pesticides can include bromadiolone, chlorophacinone, difethialone, brodifacoum, and warfarin. Anticoagulant rodenticides (ARs), contrary to the agency’s assertions, can be transported to aquatic ecosystems, including both freshwater and marine environments. As mentioned in Beyond Pesticides’ comments, ARs have been detected in raw and treated wastewater, sewage sludge, estuarine sediments, suspended particulate matter, and liver tissues of sampled fish, demonstrating that the aquatic environment experiences […]

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03
Mar

Elevated Pesticide Hazards from Plastic Contamination Focus of International, State, and Local Action

(Beyond Pesticides, March 3, 2025) When the United Nations (UN) adjourned the fifth session of the Intergovernmental Negotiating Committee to develop an international legally binding instrument on plastic pollution, including in the marine environment, Inger Andersen, executive director of the United Nations Environment Programme (UNEP), said, “The world’s commitment to ending plastic pollution is clear and undeniable.” She continued, “Here in Busan [Korea], talks have moved us closer to agreeing on a global legally binding treaty that will protect our health, our environment, and our future from the onslaught of plastic pollution.” In March 2022, the UN Environment Assembly adopted UNEA Resolution 5/14 entitled “End plastic pollution: Towards an international legally binding instrument.”  With the Trump Administration shutting down environmental programs and exiting from collaborative international environmental agreements, the work of the world community has taken on elevated importance, given the urgency of health, biodiversity, and environmental crises; so, too, has the work going on at the state level and in local communities across the United States. The interconnectedness of the pesticide and plastic problems was brought into focus recently with a scientific review of articles showing elevated pesticide hazards linked to plastic contamination. A literature review in Agriculture, covering over 90 scientific […]

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27
Feb

Glyphosate Weed Killer Contaminates Stem Cells, Is Linked to Blood Cancers and DNA Damage, Study Finds

(Beyond Pesticides, February 27, 2025) In analyzing current scientific literature and data on glyphosate-based herbicides (GBHs), a research article in Environmental Sciences Europe finds that glyphosate (GLY) persists in bones before reentering the bloodstream. The mechanisms in which GLY interacts with important cells for development, called hematopoietic stem cells (HSCs), and breaks and rearranges DNA offer a possible explanation for the heightened risk of cancer, specifically blood cancers like non-Hodgkin lymphoma (NHL), myeloma, and leukemia. “Existing data on GLY/GBH metabolism and genotoxicity provide critical insights into how exposures may be contributing to blood cancers,” according to the study’s author, Charles Benbrook, PhD. Dr. Benbrook continues: “A significant portion of GLY reaching blood moves quickly into bone marrow and then bone, where it can bioaccumulate and persist… Data reviewed herein suggest that a portion of the GLY excreted by most people on a daily basis can be traced to the shedding of calcium-GLY complexes in bone back into the blood supply.” This allows for near-constant contact between glyphosate molecules and hematopoietic stem cells, which are immature cells that can develop into any type of blood cell. Mutations in hematopoietic stem cells can cause blood cancers to emerge. Those at disproportionate risk […]

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22
Oct

Flooding Transports Pesticides from Streams to Soil and Plants, Threatens Terrestrial Food Webs

(Beyond Pesticides, October 22, 2024) A recent study, published through the American Chemical Society, analyzes pesticide contamination in riparian soil and plants as a result of flooding from streams in Germany. The authors hypothesize, and then prove, that frequently flooded sites have higher levels of pesticides present due to the pesticides in surface waters contaminating the soil. Results show that the plant vegetation in the contaminated soil then takes up the pesticides, which bioaccumulate and lead to higher contamination that can further cascade throughout the ecosystem and affect terrestrial food webs. “[O]ur study provides evidence from the field that nontarget plant species typical for riparian stream sites receive considerable pesticide exposure via flooding events,” the authors share. This exposure, and subsequent bioaccumulation in plants, threatens the food web, as many riparian plants are a vital food source for insects. According to the authors, flooding events, and their impact on pesticide contamination within soil and plants, are rarely investigated. This study, “measur[ing] 98 pesticides and metabolites in plants and root-zone soils sampled at five streams situated in an area in Southwest Germany characterized by intensive agricultural land use,” highlights the differences in contamination between frequently flooded and rarely flooded areas and […]

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12
Jun

Pesticide-Contaminated Algae Found to Jeopardize Ecosystems and Human Well-Being [Study]

(Beyond Pesticides, June 12, 2024) A study of pesticide contaminated algae finds that the disruption of algal communities has a devastating effect on the health of the aquatic food web. The study findings show that contact with pesticides can result in changes to “algal physiology, causing tissue injury, developmental delay, genotoxicity, procreative disruption, and tissue biomagnification” that alters the dominance of algae species in the environment. This in turn “can impact higher trophic levels and have a domino effect on the aquatic food web. It is possible for biodiversity to disappear, reducing ecosystem stability and resistance to environmental alterations,” the authors state. The study, a worldwide literature review conducted by researchers from India, South Korea, and Saudi Arabia, appears in Aquatic Toxicology.  The health of aquatic ecosystems is at risk with indirect effects on nontarget species from pesticides in the environment. This includes impacts on species of fish, invertebrates, microbial communities, and marine mammals. In explaining the importance of extensively studying effects of pesticides, the researchers note, “Different pesticide classes have different chemical structures, which define their modes of action and affect how they interact with both target and nontarget organisms.” Because of this, the range of effects seen from […]

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22
May

DDT Persistent in Environment 50+ Years After Ban, Found in Deep Ocean Sediment and Biota

(Beyond Pesticides, May 22, 2024) A study in the journal of Environmental Science and Technology Letters, funded by the National Oceanic and Atmospheric Administration, is the first to find halogenated organic compounds (HOCs) in deep ocean sediment and biota off the coast of California. The test area, known as the Southern California Bight (SCB), is home to historic offshore DDT waste dumping, with part of the SCB designated as a U.S. Environmental Protection Agency (EPA) Superfund site. 49 HOCs were detected in the sediment and biota, many of which are DDT-related and not previously screened for. The presence of these “unmonitored compounds can significantly contribute to the contaminant body burden across a range of marine taxa,” the study states, which leads to impacts on critical food webs and biodiversity. While this study is the first to specifically analyze previously overlooked DDT+ compounds, the results are nothing new. There is a body of science around the bioaccumulation and biomagnification of harmful pollutants that continue to lead to a decline in biodiversity, negative impacts on water and soil, and detrimental human health effects.       To assess the bioavailability of DDT+ and HOCs in the deep ocean food web, this study focused on […]

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10
May

Organic Farming Shown to Reduce Pesticide Load in Bird of Prey Species

(Beyond Pesticides, May 10, 2024) A study published by scientists in France from La Rochelle University’s ChizĂ© Center for Biological Studies, in collaboration with the University of Strasbourg and the University of Burgundy, finds lower pesticide load in chicks from a bird of prey species in areas with organic farming. A correlation between lower numbers of pesticides in the blood of birds with the presence of organic farms surrounding the habitats was determined after analyzing 55 Montagu’s harrier (Circus pygargus) nestlings from 22 different nests in southwestern France. As the percentage of organic agriculture around the nests increased, there was a significant decrease in the quantity and types of pesticides detected within the chicks’ blood.  In beginning this study, the scientists hypothesized that “the application of organic farming practices is expected to reduce contamination levels in the environment and consequently in wildlife.” They also referenced studies, such as a soil study, that aided in this speculation: “In an analysis of topsoil samples collected across Europe, samples from organic farms showed significantly fewer pesticide residues and in lower concentrations than those from conventional farms … [with] 70 to 90% lower concentrations.”   This study screened for 104 total compounds, 28 of which […]

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