(Beyond Pesticides, September 5, 2025) A study in Journal of Agricultural and Food Chemistry finds permethrin, a commonly used synthetic pyrethroid insecticide, to be disruptive to the gut microbiome, altering microbiota and leading to increased formation of fat cells (adipogenesis) and metabolic disorders. With an aim to “comprehensively elucidate the effects of permethrin on gut microbiota, lipogenesis, and the associated molecular mechanisms,” the study explores the adverse effects of permethrin exposure in adult mice through multiple experiments. “Our study provides the first in vivo [in a living organism] evidence suggesting a potentially causal relationship between permethrin exposure and the development of obesity, potentially mediated by specific gut microbiota-derived metabolites,” the researchers explain. They continue, “Notably, this work is the first to define a distinct microbiota−metabolite−host axis as a critical mediator of environmental toxicant-induced metabolic dysfunction.” Permethrin is widely used as an insecticide on crops, such as cotton, corn, and wheat, as well as on livestock, in indoor and outdoor areas, and for treating lice and scabies. Mosquito abatement programs often utilize permethrin, further adding to the various exposure routes of this neurotoxic chemical. (See additional uses and health effects of permethrin in Beyond Pesticides’ Gateway on Pesticide Hazards and Safe […]

(Beyond Pesticides, September 4, 2025) A review of agricultural neonicotinoid insecticide regulations, published in Pest Management Science, evaluates the varied approaches being taken for bans and exemption-based restrictions in the European Union (EU), Canada, and the United States (U.S.). Despite an ever-growing and overwhelming body of science linking neonicotinoids (neonics) to adverse effects on pollinators and other nontarget species, the regulations fall short in protecting the environment and wildlife. The review, with the history and current status of neonics, lends further support for a full transition to organic agriculture and land management that removes neonicotinoid exposure routes and subsequent health threats. With the application of this widely used class of neurotoxic system insecticides increasing, so too has the concern over the long-term chronic effects on pollinators and other species from exposure. This concern, backed by scientific literature, has “led to increased governmental regulations since the mid-2010s, particularly in agricultural settings,” state the authors from Iowa State University and Washington State University. They continue, “These regulations have varied in terms of approach, geography, and timeline, starting with a ban implemented by the European Union (EU) and evolving into exemption-based regulations across two Canadian provinces and five U.S. states as of this […]

(Beyond Pesticides, September 2, 2025) It did not go without notice to U.S. grassroots environmental and public health advocates that earlier this month, over two million people in France signed a “first of its kind” petition that ultimately prevented the overturning of the country’s ban on bee-killing neonicotinoid insecticides. The action was widely covered in France, including in Le Monde. This uprising, organized by 23-year-old French master’s student Eleonore Pattery, emphasizes the importance of individuals in communities mobilizing people to protect the planet from pesticides that are having a devastating adverse effect on health and the environment. The grassroots push in France taps into a deep public concern about health and the environment that is emblematic of the level of public engagement needed to thwart the high level of chemical industry, agribusiness, and allied corporate influence that undermines basic protections. Industry interests have long been embedded in federal environmental and public health laws. For example, federal and state pesticide laws (the Federal Insecticide, Fungicide, and Rodenticide Act and similar state laws) allow widespread exposure to toxic chemicals despite the availability of nontoxic alternatives that are both efficacious and cost-effective. Without public engagement, as seen in France, significant improvements in law are constantly […]

(Beyond Pesticides, August 28, 2025) The U.S. Environmental Protection Agency (EPA) on August 12, 2025, released a statement, “EPA Announces Action to Protect Endangered Species from Insecticide Methomyl,” in which the agency announced label changes for methomyl, a carbamate insecticide, with mitigation measures that are being criticized as allowing great risks to biodiversity and human health. The label changes, following the National Marine Fisheries Service’s (NMFS) final biological opinion issued on January 1, 2024, actually establish mitigation measures to be determined by applicators using the Bulletins Live! Two website prior to use. EPA claims that this grower determined action will meet the standards of the Endangered Species Act (ESA) by “reduc[ing] runoff and spray drift from treated areas into species’ habitats.” However, the process does not include monitoring and oversight to determine whether the rigorous standards of ESA are being met. The agency says that mitigation tracking is “at the field or farm level,” but it is not required to be submitted to the agency. EPA announced on August 20 that it is holding a 90-minute public webinar on September 16, 2025, at 2:00 PM ET to provide information on the ecological runoff/erosion and spray drift mitigation measures that can […]

(Beyond Pesticides, August 26, 2025) A scientific review in World’s Poultry Science Journal highlights the adverse health effects on avian species from exposure to the widely used weed killer glyphosate (Roundupᵀᴹ) throughout the process of poultry production. The herbicide enters the poultry production system through residues in genetically engineered feed. An earlier article in Scientific Reports concludes that glyphosate’s (GLP) “widespread application on feed crops leaves residues in the feed,” while residues are “found to be common in conventional eggs acquired from grocery stores.” In analyzing the biochemical, toxicological, and ecological impacts of glyphosate on poultry, particularly chickens, the authors find a wide body of evidence linking glyphosate and its metabolite (breakdown product) aminomethylphosphonic acid (AMPA) to debilitating hazards that extend beyond mortality. These sublethal effects include disruption of the gut microbiome and gastrointestinal disease; decreased productivity and diminished reproductive health; hepatic and kidney toxicity; growth and developmental impacts, including teratogenicity and embryotoxicity; endocrine disruption and oxidative stress; and impaired immune functions. The effects of glyphosate, as have long been documented in the scientific literature and covered by Beyond Pesticides here, range from negative impacts on biodiversity and the environment to food safety risks and human health implications. Residues of […]

(Beyond Pesticides, August 21, 2025) The presence of Varroa mites in combination with the neonicotinoid insecticide imidacloprid increases the risk of bee mortality and disrupts the larval gut microbiome, according to a study of the synergy (a greater combined effect) between Varroa destructor, a parasitic mite that attacks and feeds on honey bees, and imidacloprid. The study in Pesticide Biochemistry and Physiology adds to the growing body of science on the severely declining bee population by investigating the toxic effects of both the parasites and pesticide stressors in honey bees (Apis mellifera). “Given that V. destructor may increase bees’ sensitivity to imidacloprid by compromising their physiological health and immunity, this study systematically assesses the effects of V. destructor infestation and imidacloprid exposure on honey bee survival, detoxification enzyme activity, and gut microbiota,” the authors explain. The intestinal tract and gut microbiome are crucial for digestion, metabolism, nutrient absorption, immune regulation, and pathogen defense. Within honey bees, the gut microbiome is “highly susceptible to external environmental stressors, such as pesticide exposure and parasitic infections [and] these disturbances can lead to microbial imbalances, ultimately affecting bee health.” (See studies here and here.) Previous research earlier this year, captured in Daily News Variability […]

(Beyond Pesticides, August 19, 2025) A new study from Argentina highlights the importance of applying the concept of the exposome (total exposures over lifetime) as a scientific framework, the value of biomonitoring, and findings of adverse pregnancy outcomes. The study documents the presence and effects of pesticides on maternal and fetal health during pregnancy. The results show that pregnant Argentine women are exposed to dozens of pesticides, and that certain mixtures of these chemicals are associated with harm to pregnancy outcomes, especially among rural women. The exposome, the authors write, comprises the “non-genetic factors that may be involved in the development or aggravation of human disease. The prenatal exposome includes all environmental chemicals that the mother is exposed to during pregnancy (maternal exposome) and those chemicals that reach the placenta and fetus from the maternal circulation (fetal exposome).” The authors emphasize that understanding the exposome almost by definition requires studying mixtures of environmental chemicals rather than analyzing the effects of each in isolation. The second important aspect of the study is its use of biomonitoring. The researchers analyzed urine samples from 90 pregnant women in various gestational stages from rural and urban regions of Argentina. The researchers also collected demographic […]

(Beyond Pesticides, August 18, 2025)  With pesticide manufacturers pushing to stop cancer victims (and others suffering adverse effects) from suing them under longstanding ”failure to warn law,“ U.S. Senator Cory Booker (D-NJ) is proposing to uphold this unequivocal right to protection. Senator Booker has introduced the Pesticide Injury Accountability Act (S. 2324) to protect the rights of farmers and consumers to hold pesticide manufacturers responsible for the harm caused by their toxic products. This effort comes in the wake of congressional and state legislative attacks on “failure-to-warn” liability claims that are taking place in response to extraordinary jury verdicts against Bayer/Monsanto for harm caused by glyphosate weed killer products like Roundup.ᵀᴹ 📣 Beyond Pesticides, with allied organizations across the U.S., is asking the public to “Tell your U.S. Senator to co-sponsor S. 2324, the Pesticide Injury Accountability Act.” This bill will amend the Federal Insecticide, Fungicide, and Rodenticide Act of 1972 (FIFRA) to create a federal right of action for anyone who is harmed by a toxic pesticide.  Despite growing peer-reviewed scientific evidence linking widely used pesticides to a host of health harms, including cancers, birth defects, endocrine disruption, Parkinson’s disease, and infertility, the chemical industry and its allies in elective office are pushing to deny victims access to […]

(Beyond Pesticides, August 15, 2025) In analyzing the data present in an article in Data in Brief, concerning levels of pesticide biomarkers are present in the urine of adolescents and young adults that are linked to numerous health implications. The biomonitoring data, collected at two time points from participants in a longitudinal cohort study in the agricultural county of Pedro Moncayo, Ecuador, encompasses a total of 23 compounds used as herbicides, insecticides, and fungicides and their associated metabolites (breakdown products), which include organophosphates, pyrethroids, and neonicotinoids. The results highlight the disproportionate risks to a Latin American population that occur as a result of living in areas with heavy chemical-intensive agriculture. “This article presents urinary pesticide metabolite concentrations for 665 participants in the ‘Study of Secondary Exposure to Pesticides among Children, Adolescents, and Adults’ (ESPINA), which were collected during two follow-up assessments,” the authors describe. The first sampling period from July to October 2016, referred to as Follow-up Year [FUY]-8b, includes 529 of the participants, while the second sampling period from July to September 2022 (FUY-14a) includes 505 of the participants. All participants are within the agricultural community of Pedro Moncayo. As the authors note, “The ESPINA study aimed to include […]

(Beyond Pesticides, August 14, 2025) A review in Clinical and Experimental Obstetrics & Gynecology links various classes of environmental pollutants including pesticides and per- and polyfluoroalkyl substances (PFAS), both of which Beyond Pesticides has extensively covered, to adverse effects on the female reproductive system and common mechanisms of toxicity. These chemicals “disrupt the hypothalamic-pituitary-gonadal axis (HPG), impair ovarian function, and contribute to reproductive dysfunction through mechanisms such as oxidative stress, hormonal disruption, and epigenetic [gene expression or behavior] modifications,” the authors say. This leads to menstrual irregularities, infertility, and pregnancy complications, as well as increases in the risk of reproductive system disorders such as endometriosis, polycystic ovary syndrome (PCOS), and ovarian cancer, among others. “Additionally, transgenerational effects mediated by epigenetic modifications, germ cell damage, and placental transfer may adversely affect offspring health, increasing the risk of reproductive dysfunction, neurodevelopmental disorders, metabolic diseases, and cancer,” the researchers explain. This study, integrating recent epidemiological and experimental findings, provides an overview of major chemical classes that threaten women’s health and highlights the need for immediate action. As the authors point out, female reproductive health is important not only for those who choose to plan for a family but also for the overall well-being […]

(Beyond Pesticides, August 13, 2025) The data on the adverse effects of the insecticide chlorpyrifos, still widely used in food production, continued to accumulate with the latest being a study published in PLOS One that finds perinatal exposure to the chemical in mice can alter sleeping patterns, lead to brain inflammation (particularly in female individuals), and impact gene expression linked to immune response and epigenetic effects. The adverse health effects are greater overall in female mice than male mice, emphasizing the significance of disproportionate impacts across species. Chlorpyrifos has been a threat to human and ecological health for decades, originally as a general-use pesticide for homes, gardens, and agriculture, and then restricted to most nonresidential uses in 2000. Currently, the chemical’s permitted uses include food and feed crops, golf courses, as a non-structural wood treatment, and adult mosquito control for public health (insect-borne diseases) uses only. According to health and environmental advocates, there is a long history of U.S. Environmental Protection Agency (EPA) failure to adequately protect human and environmental health from chlorpyrifos, which is linked to endocrine disruption, reproductive effects, neurotoxicity, brain, kidney, and liver damage, and birth and developmental effects. It took 21 years after negotiating a stop […]

(Beyond Pesticides, August 12, 2025) Last week on August 9, the United Nations observed International Day of the World’s Indigenous Peoples, a critical acknowledgement of Indigenous “food sovereignty, food security, biodiversity conservation and climate resilience,” as outlined in the report of the Expert Mechanism on the Rights of Indigenous Peoples, Eighteenth Session (July 14–18, 2025). As the report states, under Article 20 of the UN Declaration on the Rights of Indigenous Peoples, “Indigenous Peoples possess distinct economic systems rooted in traditional knowledge, practices and resources and have the right to sustain, strengthen and develop these systems in accordance with their cultures, traditions, values and aspirations.” It continues, “When deprived of their means of subsistence and development, this article provides that Indigenous Peoples are entitled to just and fair redress.” In a statement recognizing the importance of the day, Special Rapporteur on the rights of Indigenous Peoples, Albert K. Barume, focuses on the need for Artificial Intelligence (AI) to recognize that, “Indigenous Peoples have long been stewards of knowledge, biodiversity, and sustainable living [and] [w]ithout their meaningful participation, AI systems risk perpetuating historical injustices and deepening the violation of their rights.” Meanwhile, the current U.S. administration has shifted away from federal […]

(Beyond Pesticides, August 8, 2025) In a study published in Environmental Pollution, researchers have detected eighty pesticides (35 insecticides, 29 fungicides, and 11 herbicides, and metabolites) in the ambient air of a rural region of Spain (Valencia) between 2007 and 2024. Despite these dramatic findings, the authors conclude that there is “no [observable] cancer risk,” “no inhalation risk for adults,” and only one pesticide concentration (the insecticide chlorpyrifos) showing “a potential risk to toddlers.” However, the authors did not conduct an aggregate risk assessment that would typically consider all routes of exposure to the individual pesticides detected, including through water, food, and landscapes. Not considered by the authors are the potential effects of pesticide mixtures and full pesticide product formulations (with all potentially toxic ingredients), also a deficiency in the U.S. Environmental Protection Agency (EPA) registration of pesticides under federal law. Of concern, as well, are other contaminants in pesticide products, including but not limited to per- and polyfluoroalkyl substances (PFAS), heavy metals, plastics (including microplastics), which contribute to chronic diseases and health risks, and adverse effects to ecosystem stability exacerbated by the climate crisis. Background and Methodology “This work aims to conduct a further study on the situation of […]

(Beyond Pesticides, August 7, 2025) The novel study published in Arthritis & Rheumatology is the largest investigation of rheumatoid arthritis (RA) in women to date, finding evidence of heightened risks when exposed to insecticides through data collected from over 400 eligible women in the Agricultural Health Study (AHS). AHS participants include a cohort of thousands of licensed pesticide applicators and their spouses from Iowa and North Carolina, with this particular study as the first to consider the link between pesticide exposure and RA as it affects women’s health.   “Growing evidence suggests farming and agricultural pesticide use may be associated with rheumatoid arthritis (RA), but few studies have examined specific pesticides and RA among farm women, who may personally use pesticides or be indirectly exposed,” the study authors explain. The findings reveal that organochlorine insecticides that continue to persist in the environment, as well as organophosphate and synthetic pyrethroid pesticides used in public health or residential settings, correlate with RA diagnoses in women.  As shared in previous Daily News, for the most part organochlorine pesticides, including dichlorodiphenyltrichloroethane (DDT), are no longer used worldwide, but the legacy of their poisoning and contamination persists. These compounds are primarily made up of chlorine atoms, […]

(Beyond Pesticides, August 6, 2025) A study published in Science of The Total Environment finds that “chronic pesticide exposure alters metabolism and impairs fish growth and health.” With increasing concern about the long-term consequences of pesticide persistence in ecosystems, the scientific literature continues to expand the body of research findings on adverse effects, including impacts on marine or aquatic ecosystems and organisms. Given the known and growing risks, there is an ongoing movement to move beyond petrochemical-based chemicals for agriculture and land management by adopting policies and programs that advance organic criteria and principles, as outlined in national organic law and practiced by tens of thousands of certified farmers and land managers across the country, and even more at the international level. Background and Methodology “The objective of this study was to assess the physiological responses of juvenile P. lineatus exposed to environmentally relevant pesticide mixtures by integrating multiple biological endpoints across sub-individual and organismal levels,” the authors write. The study was conducted at two sites in the Tibagi River watershed located in Paraná, a southern region in Brazil. There was a reference site (RFS) and an agricultural site (AGS), the former having minimal pesticide contamination and the latter having […]

(Beyond Pesticides, August 4, 2025) Comments on EPA proposal to bring back controversial use of herbicide dicamba due by Saturday, September 6, 2025, at 11:59 PM ET. With more than 90 percent of soybeans (also corn and the most common species of cotton) planted in varieties genetically engineered to be herbicide-tolerant, the agrichemical industry and industrial agribusiness are lining up to bring back agricultural spraying of the controversial weed killer dicamba—linked to crop damage associated with the chemical’s drifting off the target farms. The courts in 2020 and 2024 vacated EPA’s registration authorizing “over-the-top” (OTT) spraying of dicamba, leading to these uses being stopped in the 2025 growing season. (See Daily News.)              Genetically engineered crops, widely adopted in 1996 with Monsanto’s glyphosate-tolerant (Roundup Ready) soybean seeds and plants, have been plagued by weed resistance to the weed killers, movement of genetic material, chemical drift, and health and environmental hazards associated with pesticide exposure. Despite the problems and escalating herbicide use in chemical-dependent no-till (no tillage) agriculture, regulators at the U.S. Environmental Protection Agency (EPA) and the U.S. Department of Agriculture (USDA) have facilitated the astronomical growth of a genetically engineered food system. The industry makes the environmental argument that less […]

(Beyond Pesticides, August 1, 2025) On June 30, Kyle Kunkler started work as deputy assistant administrator for pesticides in U.S. Environmental Protection Agency’s (EPA) Office of Chemical Safety and Pollution Prevention. Mr. Kunkler is an experienced agribusiness lobbyist, having come directly from the American Soybean Association, where he was director of government affairs. He joins Nancy Beck, PhD, herself a migrant from the American Chemistry Council. Not coincidentally, a mere three weeks after Mr. Kunkler’s appointment, EPA opened the floodgates to allow use of the controversial herbicide dicamba to flow unrestricted once again through the nation’s ecosystems. Dicamba has been associated with phytotoxic crop/plant damage (leaf damage, stunted growth, or death) and cancer. Three formulations of the herbicide whose registrations had been vacated via litigation will be reinstated by EPA after a public comment period that expires on August 22 at 11:59 PM EDT. Dicamba is manifestly one of the worst ideas the pesticide industry has ever devised, according to many farmers and pesticide safety advocates. Because of resistance to other herbicides, pesticide scientists developed the “[insert pesticide]-ready” concept in which a crop plant is genetically engineered to resist exposure to a herbicide, “Roundup-Ready” seeds being the most obvious example, so […]

(Beyond Pesticides, July 31, 2025) A study published in Environmental Advances finds that hundreds of honeybee hives across central and northern Italy are contaminated with various pesticides and their metabolites, including glyphosate and fosetyl.  “There was no significant difference in glyphosate presence between dead/dying and live bees, suggesting chronic exposure rather than acute toxicity. However, higher pesticide concentrations in dead/dying bees indicate potential sublethal effects contributing to colony distress,” according to the authors. This peer-reviewed study builds on the mounting evidence outlined in the literature connecting pesticide residues to nontarget harm to pollinators and other insects and animals that are critical to biodiversity. Background and Methodology “The primary objectives of this study were to develop and validate a reliable, sensitive method for analyzing polar pesticides [highly soluble in water] in honeybees and to investigate polar pesticides residue levels in honeybees across northern and central Italy,” say the researchers of this study, who conduct research at the Experimental Zooprophylactic Institute of Lombardy and Emilia Romagna “Bruno Ubertini”, Experimental Zooprophylactic Institute of Umbria and Marche “Togo Rosati”, and Experimental Zooprophylactic Institute of Lazio and Tuscany “M. Aleandri.” 314 honeybee samples were gathered voluntarily from local beekeepers in six regions of northern and […]

(Beyond Pesticides, July 30, 2025) The definition of per- and polyfluoroalkyl substances (PFAS), also known as “forever chemicals” due to their persistence, continues to be debated in regulatory agencies, with many scientists arguing that certain types of chemicals in this vast group are not accurately captured in risk assessments. A wide body of science on the adverse health and environmental effects of PFAS exists, as these synthetic chemicals have become ubiquitous in nature, wildlife, and humans, as demonstrated by biomonitoring studies. Recent research, documented in a literature review in Environmental Science & Technology and additional articles, highlights the importance of a universal, cohesive definition of PFAS that incorporates all fluorinated compounds, including the long carbon chain PFOA (perfluorooactanoic acid) and PFOS (perfluorooctanesulfonic acid) as well as the ultrashort-chain perfluoroalkyl acids (PFAAs). In order to protect health and the environment from the ever-increasing threat of both long and short chain PFAS’ adverse effects, including cancer, endocrine-disrupting effects, and immune system damage, a comprehensive definition of the compounds causing harm is critical to adequate protection and regulatory decisions. The multitude of sources of PFAS and various exposure routes leads to widespread contamination of the environment and organisms. PFAS in agriculture represents a […]

(Beyond Pesticides, July 25, 2025) The scientific literature shows that microplastics (MPs) and pesticides, both ubiquitous throughout the environment, have synergistic effects that threaten aquatic organisms. This means the combined toxicity of the two substances is greater than the sum of two individual exposures. The most recent study to demonstrate this, published in Ecotoxicology, focuses on the impacts of MPs and chlorpyrifos (CPF), a widely used organophosphate insecticide, on cladocerans, a group of microcrustaceans. As Beyond Pesticides has previously reported, microplastics are found in all environments and threaten not only human health but all wildlife in both aquatic and terrestrial ecosystems. The universal distribution of plastics means that they cannot be avoided. Humans and other organisms take up plastics in the form of microparticles and nanoparticles by inhalation, ingestion, and skin contact every day. Microplastics are about the width of a human hair; nanoplastics are much smaller, about twice the width of a DNA strand. Larger pieces of plastic are ground down to these tiny sizes by weathering, temperature, biological processes, and chemical conditions. (See additional Daily News coverage on the health and environmental hazards of plastics here, here, and here.) The authors of the current study, in exposing two […]

(Beyond Pesticides, July 23, 2025) Attention turns to the U.S. Senate on legislation that (i) shields pesticide companies from lawsuits by those harmed from pesticide product use, (ii) limits states’ authority to regulate pesticides, and (iii) prevents EPA from regulating PFAS—after passage in the House Appropriations Committee on July 22. The Senate Appropriations Committee meets tomorrow, July 24, to vote on language that has not yet been released to the public. Efforts by Democrats failed to strike sections 453, the shield provision, and 507, the PFAS (per- and polyfluoroalkyl substances) language, from the FY26 Interior-Environment Appropriations Bill. The same provisions could show up in the Senate Appropriations Bill. Beyond Pesticides is: Asking U.S. Senators to help stop Appropriations Bill provisions that strip farmers and consumers from suing for pesticide harm, ensuring that language in House Appropriations Bill, Sections 453 and 507, not be included in the Senate bill. *If  Senator is on the Appropriations Committee, the letter submitted will automatically adjust the language by recognizing their Committee membership. The Need for Court Action in the Face of EPA Dismantling With the massive dismantling of U.S. Environmental Protection Agency (EPA) programs by the current administration, the appropriations bill provision limits court oversight, […]

(Beyond Pesticides, July 21, 2025) Beyond Pesticides is asking every member of the U.S. Representatives to voice their opposition in advance of a vote as early as Tuesday, July 22 on a provision before the House Appropriations Committee—in the Interior-Environment Appropriations Bill—that shields pesticide companies from lawsuits by those harmed from pesticide product use and limits states’ authority to regulate pesticides. This is a fight to protect farmers’ and consumers’ right to sue pesticide manufacturers for misbranding products and their failure to warn product users. The language before the Committee is in Section 453 of the bill passed last week by the subcommittee on a straight party-line vote, with Republicans supporting the bill language. Beyond Pesticides is also asking Congress members to remove section 507, which prohibits EPA action on PFAS (per- and polyfluoroalkyl substances), including fluorinated pesticides.  Update from July 21, 2025, at 4 PM: ⏰ Representative Chellie Pingree (D-ME-1) moved forward with amendments to strike sections 453 and 507 of the FY26 Interior-Environment Appropriations Bill, which is a provision that provides immunity for pesticide manufacturers from farmer and consumer lawsuits seeking compensation from product harm. Update from July 23, 2025, at 10 AM: The FY26 Interior-Environment Appropriations Bill passed out of […]

(Beyond Pesticides, July 18, 2025) A study in Royal Society Open Science shows intraspecific differences (between individuals of a species) in wild bumblebees (Bombus vosnesenskii) exposed to an herbicide (glyphosate), a fungicide (tebuconazole), and an insecticide (imidacloprid), with gut microbiome health as a factor. “Wild pollinator declines are increasingly linked to pesticide exposure, yet it is unclear how intraspecific differences contribute to observed variation in sensitivity, and the role gut microbes play in the sensitivity of wild bees is largely unexplored,” the authors explain. “Here, we investigate site-level differences in survival and microbiome structure of a wild bumble bee exposed to multiple pesticides, both individually and in combination.” In collecting 175 individuals of this wild, foraging species from an alpine meadow, a valley lake shoreline, and a suburban park and exposing them to a diet with individual pesticides and mixtures, the researchers assess the varying lethal and sublethal effects that can occur with pesticide exposure. Between the three sites, the survival differences “emphasize the importance of considering population of origin when studying pesticide toxicity of wild bees” and highlight how pesticide sensitivity not only varies between species but within individuals of the same species with site-specific impacts. (See previous Daily […]