(Beyond Pesticides, January 21, 2020) As news reports come in demonstrating the threats to major groups of organisms, such as insects and birds, and the stability of Earth’s ecosystems, and scientists appeal for major policy changes, recent actions by the Environmental Protection Agency’s Science Advisory Board highlight the need for public insistence that EPA do its job. Tell EPA Administrator Andrew Wheeler to follow the advice of scientists and do his job. Tell your Congressional representatives to support scientific integrity at EPA and other agencies. Although the influence of regulated corporations has historically silenced science that threatens profits–as shown by industry reaction to Rachel Carson’s Silent Spring—attacks on science in federal agencies have increased in the Trump administration. EPA has dismissed findings of scientists concerning chlorpyrifos, atrazine, and synthetic pyrethroids. Now EPA’s war on its own scientists has reached the point that its Science Advisory Board, which oversees the scientific integrity of the agency’s regulation, posted letters on-line criticizing EPA’s rollback of environmental protections. As reported in a front page story on January 1, 2020 by The New York Times, “A top panel of government-appointed scientists, many of them hand-selected by the Trump administration, said on Tuesday that three of President Trump’s most far-reaching and scrutinized proposals to weaken major […]

(Beyond Pesticides, December 9, 2019) Although the influence of regulated corporations has historically silenced science that threatens profits – as shown by industry reaction to Rachel Carson’s Silent Spring – attacks on science in federal agencies have increased in the Trump administration. EPA has dismissed findings of scientists concerning chlorpyrifos, atrazine, and synthetic pyrethroids. The U.S. Department of Agriculture has discontinued collecting data on honeybees. The U.S. Fish and Wildlife Service refused to designate critical habitat for the endangered rusty patched bumblebee. Tell your Congressional Representative to cosponsor H.R. 1709, the Scientific Integrity Act, and thank those who already have cosponsored. H.R. 1709, the Scientific Integrity Act, was introduced by Rep. Paul Tonko of New York, in an effort to restore scientific integrity to government agency decision-making. The bill begins with the premise that “science and the scientific process should inform and guide public policy decisions on a wide range of issues, including improvement of public health, protection of the environment, and protection of national security.” It prohibits scientific misconduct, suppression of scientific findings, intimidation of researchers, and creation of barriers to communicating scientific or technical findings. It limits the actions an agency may take in the process of approving dissemination of scientific results and gives individual researchers […]

(Beyond Pesticides, November 25, 2019) Continuing its marathon of deregulation to benefit the chemical industry, the Trump administration’s Environmental Protection Agency (EPA) announced its proposal to increase the amount of the weed killer atrazine allowed in U.S. waterways by 50% during the chemical’s registration review—a stark reversal of previous proposals to significantly reduce atrazine levels in the environment. The atrazine proposal follows closely on the heels of a proposal to further weaken protections regarding 23 pyrethroid insecticides that have been repeatedly linked by peer-reviewed studies to neurological issues such as learning disabilities in children. Ask Congress to request an investigation into whether EPA is ignoring its statutory duty and regulatory requirements to use science in its proposals. EPA’s atrazine proposal comes after agrichemical giant Syngenta and the National Corn Growers Association requested that EPA dismiss independent research regarding the adverse impact of atrazine. Atrazine, a broadleaf herbicide, is linked to endocrine disruption, neuropathy, and cancer. It disrupts the sexual development of frogs at levels far below the current allowed concentrations by EPA. Studies by Tyrone Hayes, PhD, University of California, Berkeley, and others have shown that concentrations as low as 0.1 ppb turn tadpoles into hermaphrodites. A 2009 study linked birth defects like gastroschisis and choanal atresia to the relative concentrations of atrazine and other pesticides […]

(Beyond Pesticides, November 20, 2019) Continuing its marathon of deregulation to benefit the chemical industry, the Trump administration’s Environmental Protection Agency (EPA) released a memo announcing its proposal to increase the amount of the weed killer atrazine allowed in U.S. waterways by 50% during the chemical’s registration review—a stark reversal of previous proposals to significantly reduce atrazine levels in the environment. The proposal comes after agrichemical giant Syngenta and the National Corn Growers Association requested that EPA dismiss independent research regarding the adverse impact of atrazine.  Atrazine, a broadleaf herbicide, is linked to endocrine disruption, neuropathy, and cancer. It disrupts the sexual development of frogs at levels far below the current allowed concentrations by EPA. Studies by Tyrone Hayes, Ph.D., University of California, Berkeley, and others have shown that concentrations as low as 0.1ppb interfere with mammary gland development in the breast of mammals. In 2009, a study linked birth defects like gastroschisis and choanal atresia to time of conception and the relative concentrations of atrazine and other pesticides in drinking water. The current Concentration Equivalent Level of Concern (CELOC), a measure in place to protect aquatic organisms, for atrazine is a 60-day average concentration of 10 ppb. EPA’s proposal […]

(Beyond Pesticides, November 15, 2019) The Endangered Species Coalition has released its newest annual report on the 10 U.S. species most threatened by pesticide use, Poisoned: 10 American species imperiled by pesticides. Produced with seven of its member groups, the coalition introduces the report by noting, “Our world is awash in chemicals. We’re particularly addicted to pesticides.” It points to well-known harms, and identifies the exacerbating factors of both climate change and the Trump administration, the latter of which “denies the reality of climate change and has dramatically changed how the Endangered Species Act (ESA) is implemented, leaving vulnerable species at far greater risk.” The introduction ends on a somewhat encouraging tone, saying that previous administrations have supported record growth in organic farming — the solution to pesticides harms that Beyond Pesticides has long endorsed — and that “any administration has the power to get us back on track and away from pesticides.” Impacts on wildlife linked to pesticide exposures — including mammals, bees and other pollinators, fish and other aquatic organisms, birds, and the biota within soil — have been well documented by Beyond Pesticides, and include reproductive, neurological, renal, hepatic, endocrine disruptive, and developmental anomalies, as well as […]

(Beyond Pesticides, October 31, 2019) Last week the U.S. District Court in San Francisco ruled that the Environmental Protection Agency (EPA) must assess the risk eight toxic pesticides pose to protected organisms: atrazine, carbaryl, methomyl, and simazine as well as rodenticides brodifacoum, bromadiolone, warfarin and zinc phosphide. The plaintiffs, Center for Biological Diversity (CBD) and Pesticide Action Network North America (PANNA) asserted that EPA and its then administrator Scott Pruitt violated duties under the Endangered Species Act (ESA) by not consulting with the Fish and Wildlife Service and National Marine Fisheries Service in registering these pesticides. The history of this case extends over 8 years. Last year, the court rejected EPA’s attempts to dismiss the lawsuit. According to CBD’s press release, “Under the agreement the agency must complete assessments of four pesticides, including atrazine, the nation’s second most-used pesticide, by 2021. Assessments of four rodenticides, including the widely used rat poison brodifacoum, must be finalized in 2024.” Stephanie Parent, an attorney at the Center for Biological Diversity, said “This important step is only the start. We still have work to do to make sure the EPA addresses the harms of all pesticides, as the law requires. EPA was created after […]

(Beyond Pesticides, October 1, 2019) Commonly used fungicides induce trophic cascades that can lead to the overgrowth of algae, according to research published in the journal Chemosphere. While the current process for regulating pesticides in the U.S. focuses on the acute toxicity of pesticides, and may consider some chronic impacts, real world complexities as described in the current study are not reviewed. This gap in our assessment can lead to significant adverse effects not just on individual species, but entire ecosystems. Researchers investigated how fungal parasites known as chytrids control the growth of phytoplankton. While some strains of chytrids are notorious for their impact to frog species, some do in fact provide important stopgaps within ecosystems. “By infecting cyanobacteria, parasitic fungi limit their growth and thus reduce the occurrence and intensity of toxic algal blooms,” says IGB researcher Ramsy Agha, PhD, co-author the study. “Whereas we usually perceive disease as a negative phenomenon, parasites are very important for the normal functioning of aquatic ecosystems and can — as in this case — also have positive effects. Pollution by fungicides can interfere with this natural process,” the researcher adds. The agricultural fungicides tebuconazole and azoxystrobin were tested on chytrid-infected toxic bloom-forming […]

(Beyond Pesticides, July 24, 2019) The U.S. District Court for the District of Hawai’i has found the state’s Agribusiness Development Corporation (ADC) guilty of violating the Clean Water Act. The case, brought by organizations including Surfrider Foundation, Pesticide Action Network North America, and others, represented by Earthjustice, accused ADC of dumping water contaminated with pesticides, including the cancer-causing herbicide glyphosate, into the Pacific Ocean off of West Kauai without a permit since 2015. Hawai’i bears the brunt of agribusiness wrongdoings, and Kauai in particular has faced past issues of pesticide injustice at the hands of the ADC. However, this new ruling marks a turn in past decisions that have favored agribusiness, as the judge found ADC violations. Advocates hope that this decision will highlight the need for government accountability, and increase transparency about what pesticides and chemicals are entering our oceans. The ADC system collects groundwater and storm water runoff through a series of canals, ditches, and pumps. The polluted water, full of toxic pesticides and chemicals, discharges into the Pacific Ocean along popular beaches that residents use for recreational activities, including surfing and fishing. The case brought against ADC accuses the department of dumping this water without a National […]

(Beyond Pesticides, May 1, 2019) Evidence of the dangers of glyphosate continues to mount: researchers at Washington State University have identified, in research that exposed pregnant rats to the compound, significant disease and pathology in subsequent generations. The rats were exposed, from day 8 through day 14 of gestation, to half the observable adverse effect level (NOAEL) of glyphosate. Although this study found negligible impacts on the pregnant rats themselves or on their first-generation offspring, dramatic increases in incidence of pathology showed up in the two subsequent generations, including reproductive (prostate and ovarian) and kidney diseases; obesity; and birth anomalies. The study, published in the journal Scientific Reports (an open access, multidisciplinary journal from Nature Research), and conducted by Michael Skinner, Ph.D. and five colleagues, is the first to assess the potential transgenerational impacts of glyphosate in mammals. Its results point to an emerging frontier in assessing the risks of glyphosate and other toxic chemicals, and add to the urgent and growing demand that the use of this particular toxic — and pervasive — pesticide be halted. The research team was interested in looking at possible transgenerational impacts of glyphosate in part because of its ubiquity: it is one of the […]

(Beyond Pesticides, April 17, 2019)  A neurotoxic pesticide labeled “bee-safe” has been found to be harmful to bees, according to a new study. Flupyradifurone (FPF), the subject of the study, is a novel chemical that was hastily registered in the wake of public awareness about the impact of neonicotinoid insecticides on bees. A systemic insecticide and a nicotinic acetylcholine receptor (nAChR) agonist, it functions in the same way as a neonicotinoid, though it is in the butanolide family. “Lethal and sublethal synergistic effects of a new systemic pesticide, flupyradifurone (Sivanto®), on honeybees,” not only debunks the myth that FPF is safe on its own, it also delves into the FPF’s synergistic effects with a commonly used fungicide propiconazole (PRO). PRO, on its own, has no impact on bee mortality. A rarely studied realm of pesticides, the study defines a synergistic effect as, “when combined exposure to two factors results in an effect that is significantly greater than the sum of individual effects.” Researchers manipulated six healthy honey bee (Apis mellifera ligutica) colonies and observed the impact of varying amounts of pesticide exposure, including both individual and synergistic effects, on behavior and mortality. They recorded data over seasons and between worker […]

(Beyond Pesticides, April 11, 2019) A recent study of 29 discrete, small European waterways found ubiquitous pesticide contamination. Analyzed samples contained a total of 103 different pesticides and 21 veterinary drugs. These data add to the growing body of evidence that there is a significant, ongoing threat to the aquatic environment as a result of chemical-intensive farming practices. Researchers took a “snapshot” of samples from streams, rivers, and canals in ten different countries: Austria, Belgium, Denmark, France, Germany, Italy, The Netherlands, Poland, Spain, and the United Kingdom. Sample sites were chosen in rural areas with arable land. The water samples were screened for a wide range of pesticides and veterinary drugs using liquid chromatography. The study was published in the journal Science of the Total Environment. Pesticides find their way into water systems via dry deposition (absorption of particles from the atmosphere), pesticide drift, and runoff from contaminated soils. Of the total 103 detected pesticides, 45% were herbicides. Terbuthylazine, a broadleaf herbicide in the chemical class triazine (the same class that contains the U.S.-utilized atrazine), was found in all samples. There were 24 unapproved pesticides in the water samples. Rather than illegal current use, it is more likely that these […]

(Beyond Pesticides, March 29, 2019) The U.S. Environmental Protection Agency (EPA) made a low-key announcement on March 19 suggesting that it may change its handling of requests from states to exert stricter controls on use of pesticides than the federal agency sets out in its registration of the compounds — by disapproving them. This is potentially a big deal because it signals that the agency will be less-kindly disposed to states’ desires to establish either somewhat different parameters of use based on local conditions and needs, or more-stringent regulations on pesticide use than those set out by federal regulators. This issue of preemption of localities’ desires to protect their populations and environment has become an increasingly dynamic frontier at the nexus of pesticide use, health, and environment. Beyond Pesticides has written more frequently about this issue in recent years as the tension between centralized, federal regulation and more-local regulation has risen; see more below. EPA appears distressed by some of the approximately 300 annual requests it gets to make some adjustment to the federal regulation. This can happen under Section 24(c) of FIFRA, which allows for a Special Local Need Label, which can be requested under a variety of conditions, including […]

(Beyond Pesticides, March 14, 2019) A study, supported by the USDA’s National Institute of Food and Agriculture, finds that state pesticide preemption laws “compromise public health and economic well-being” by preventing localities from enacting pesticide use restrictions on private property that are more restrictive than their state’s regulations. In the words of the authors, “By eliminating the ability of local governments to enact ordinances to safeguard inhabitants from health risks posed by pesticides, state preemption laws denigrate public health protections.” The study, Anti-community state pesticide preemption laws prevent local governments from protecting people from harm, published in the International Journal of Agricultural Sustainability, reviews scientific and historical evidence of the failure of state and federal pesticide laws to protect localities from pesticide poisoning, and highlights the inability of localities to compensate for that failure under present laws. Communities seeking to protect their residents would typically issue community-wide restrictions to ensure protection of shared community resources, including air, land, and waterways, from pesticide drift, runoff, and other nontarget effects —as is the case with other community decisions on recycling, smoking, and zoning. The study’s authors document how industry influence led to the adoption of state laws that undermine the ability of localities […]

(Beyond Pesticides, March 7, 2019) A publication in the journal Environmental Health Perspectives highlights findings from a recent study showing that environmental concentrations of the neonicotinoid insecticides thiacloprid and imidacloprid increase expression of a gene linked to hormone-dependent breast cancer. Authors of the featured study uncovered a pathway through which neonicotinoids stimulate excess estrogen production, known to occur during the development of progressive hormone-dependent breast cancer. In the words of the authors, “Our findings highlight the need for further research to assess the potential impacts of low-dose and chronic exposure to neonicotinoids on endocrine processes affecting women’s health.” The study, published in Environmental Health Perspectives in April 2018 by researchers at the University of Quebec, is not the first to point to a potential link between neonicotinoid exposure and breast cancer. A 2015 study by the same research group revealed that the neonicotinoids thiacloprid and thiamethoxam, along with the herbicide atrazine, induce similar effects in breast cancer cells. In both studies, exposure to neonicotinoids alter promoter activity to induce heightened production of the enzyme aromatase, which is known to stimulate estrogen production and thereby cancer cell proliferation. The recently published study, authored by Silke Schmidt, PhD, brings greater urgency to […]

(Beyond Pesticides, February 5, 2019) Linuron, an herbicide registered for use by the U.S. Environmental Protection Agency (EPA), yet recently banned in Europe due to health concerns, appears to trigger inflammatory signals that have been linked to the onset of Multiple Sclerosis (MS). This new evidence, published in the journal Cell by researchers at Brigham and Women’s Hospital in Boston, MA, indicates that exposure to chemicals and pesticides in the environment may be a risk factor in the development of neurodegenerative diseases. “We created a platform to systematically investigate the understudied effects of environmental exposures,” said study coauthor Francisco Quintana, PhD. “The goal of our work is to return results that can guide future epidemiological studies and identify actionable targets.” Researchers began their investigation with 976 chemicals identified by EPA’s ToxCast program, an inventory of compounds that have undergone screening for a battery of laboratory tests. Within that inventory, 75 chemicals, including linuron, were found to interfere with the signaling pathways linked to MS. To confirm the adverse impacts, scientists used the embryos of zebrafish, animals often used as models in laboratory research. The zebrafish embryos were altered to contain low levels of myelin, a protein that protects nerve cells, as […]

(Beyond Pesticides, January 14, 2019)  A petition submitted on January 7 by the Center for Biological Diversity calls on the National Marine Fisheries Service (NMFS) and the U.S. Fish and Wildlife Service (FWS) to initiate rulemaking to proscribe nearly all pesticide use in areas that are deemed critical habitat for endangered species. It asks these federal agencies to use the authority they have under the 1973 Endangered Species Act (ESA) to protect wildlife from the threats represented by pesticides — which threats both agencies have long recognized. The language of the ESA says its purpose is “to provide a means whereby the ecosystems upon which endangered species and threatened species depend may be conserved.” In its press release on the petition, the Center for Biological Diversity (CBD) notes that it comes “after decades of intransigence by the Environmental Protection Agency, which has refused to comply with the legal mandates of the Endangered Species Act to protect the nation’s most imperiled species from highly toxic pesticides like chlorpyrifos and atrazine that are known to harm wildlife.” CBD environmental health director Lori Ann Burd said, “Pesticides pose a devastating danger to endangered wildlife, from coast to coast. If the EPA isn’t going to […]

(Beyond Pesticides, December 6, 2018) A recent analysis of annual drinking water quality reports has revealed that many community drinking water systems in the Midwest have seasonal exceedances of the allowable limit for the herbicide atrazine. Atrazine, linked to endocrine disruption, neuropathy, and cancer, is the second most widely used pesticide in corn growing areas, with over 73 million pounds applied to agricultural fields each year.  A 2009 study by Paul Winchester, MD, professor of clinical pediatrics at Indiana University School of Medicine and a neonatologist at St. Francis Hospital in Indianapolis, linked birth defects to time of conception, with the greatest impact on children conceived when concentrations of atrazine and other pesticides are highest in the local drinking water. (See Reproductive Effects Peak with Pesticide Exposure.) During peak use, atrazine levels in drinking water have been recorded at three to seven times above the legal limit. In addition to the well documented impact on the environment, recent  studies have linked prolonged pesticide exposure to not only shortened gestation and preterm birth for women, but also neurodevelopment delays in children. Ultimately, these unreported seasonal peaks may result in persistent adverse health impacts in impacted communities. The Safe Drinking Water Act (SDWA), enacted in 1974, […]

(Beyond Pesticides, October 18, 2018) Pesticide residue doesn’t announce itself –it isn’t colored, it doesn’t glow or reflect light, and after an initial application doesn’t put out a discernible odor – but it is likely ubiquitous in rural U.S. homes, according to a study published by Cornell University researchers late last month. The study is a warning specifically to households with young children, who are at increased risk of health effects from even minute levels of pesticide exposure. “Numerous health problems occur from exposure to pesticides, such as cancer, birth defects, leukemia and ocular [vision-related] toxicity, among a number of other health issues,” said Joseph Laquatra, PhD, coauthor of the research. “Households with crawling toddlers should be concerned, as toddlers will accumulate pesticide residues on their hands and then ingest them due to hand-to-mouth behaviors.” Researchers focused in on 132 households in rural counties of New York State that agreed to test for pesticide residue inside their home. Wipe samples were collected from both carpeted and non-carpeted areas, and tested for pesticides used commonly as part of agricultural production in the region. The pesticides analyzed included 15 compounds ranging from organophosphates like chlorpyrifos and malathion, to synthetic pyrethroids like resmethrin, […]

(Beyond Pesticides, August 2, 2018) Weed scientists from the University of Missouri (UM) have just published evidence of a water hemp population resistant to six different herbicides. The study is sending shock waves throughout the chemical-intensive agricultural community, particularly in light of the plant’s resistance to 2,4-D. In its reporting on the study, KTIC Rural Radio begged the question, “If we’re already seeing 2,4-D resistance now, what will happen when use of the herbicide becomes even more commonplace?” KTIC is referring to the impending commercialization of products like Enlist Duo, developed by DowDupont in an attempt to address widespread weed resistance to glyphosate. Enlist Duo is an herbicide containing both glyphosate and 2,4-D, and is intended to be sprayed only on crops genetically engineered (GE) to tolerate exposure to both chemicals. However, with growing reports like this, many farmers may begin to rethink their approach. In 2014, a farmer contacted UM indicating that water hemp was not responding to 2,4-D during a regular ‘burndown’ the farmer conducted before planting a new crop. (Chemical-intensive farmers will often use a synthetic herbicide to clear their field for new plantings.) The farmer had also used other herbicides, fomesafen and glyphosate, in this process […]

(Beyond Pesticides, April 25, 2018)  A class-action lawsuit against two manufacturers of neonicotinoid insecticides is moving ahead in Quebec, Canada after an appeal to block the case by the Canadian government and the chemical companies, Bayer and Syngenta, was dismissed. In February 2018, the case, brought by a beekeeper, was allowed to proceed to trial by the Quebec Superior Court. Quebec queen bee breeder, Steve Martineau, conducted tests on water and his dead and dying bees and found traces of neonicotinoids. His suit alleges that Bayer and Syngenta were negligent in the manufacture and sale of neonicotinoids in Quebec, and are responsible for damages that he and other class members suffered under Article 1457 of the Quebec Civil Code. Bayer and Syngenta challenged the application on a number of grounds including the assumption that they had manufactured the neonicotinoids which killed Martineau’s bees. The class in this case was authorized for all persons in Quebec who own or owned bees in the affected area since 2006. Mr. Martineau estimates he has lost about $20,000 a year to present due to the effects of neonicotinoids on his bee population (Martineau v. Bayer CropScience Inc. CALN/2018-007) “We’re suing on behalf of Quebec beekeepers whose bees were […]

(Beyond Pesticides, February 21, 2018) Officials in Quebec announced this week that the Canadian province will implement new restrictions on the use of five highly toxic pesticides. As part of efforts to fulfill the vision of the Quebec Pesticide Strategy, a progressive, forward-thinking framework for pesticide regulation announced in 2015, atrazine, chlorpyrifos, and the neonicotinoids imidacloprid, clothianidin, and thiamethoxam will have new limits placed on their use. “Together with the groups involved, we have found a balanced regulatory solution to protect the health of our farmers, aquatic ecosystems and pollinators,” Isabelle Melancon, Quebec’s Minister of Sustainable Development, Environment, and the Fight Against Climate Change (Environment Ministry) said in a press release. “We hope to obtain in this way a significant reduction in the use of the most at-risk pesticides in Quebec, in a framework of transparency and integrity.” Quebec’s new rules offer a range of positive developments for human health and wildlife. The changes will require the following: Prior to any application of atrazine, chlorpyrifos, or neonicotinoid class insecticide, farmers will need the approval of a certified agronomist from the Ordre des agronomes du Quebec (OAQ). Agricultural producers will be required to keep a record of all pesticides applied, as […]

(Beyond Pesticides, October 19, 2017) Exposure to the second most commonly used herbicide in the U.S., atrazine, results in a lower proportion of male frogs in populations of Blanchard’s cricket frogs, according to researchers from Ohio’s Miami University. While it may be ostensibly easy to dismiss the results of this study as limited to a single frog species, the Blanchard cricket frog, with its populations concentrated in heavily farmed Midwestern states, is likely an important indicator of broader ecological impacts. Ultimately, only a transition away from toxic herbicides and towards integrated organic systems will successfully address the ongoing effects of industrial agrichemicals on amphibians. Miami researchers exposed frogs to varying concentrations of atrazine, 0.1, 1, and 10 μg/L, in the laboratory, in order to investigate sex ratios and potential effects on survival of the population. Although no significant effects were seen on survival rate during the course of the study, sex ratios were significantly altered at the 0.1 and 10 μg/L exposure concentrations. At these levels, populations developed 51 and 55% fewer males respectively than control frogs. Researchers point out that such significant results seen at such low concentrations likely indicates that sex ratios are also skewed in the wild. […]

(Beyond Pesticides, September 27, 2017) Adverse health effects caused by exposure to the widely used herbicide atrazine pass down from parents to their children through multiple generations, according to new research published by scientists at Washington State University. This burgeoning area of study on ‘transgenerational’ impacts calls into question the current methodology for assessing toxicity and risk from chemical exposure. With the current U.S. regulatory system permitting food and communities to be awash in toxic pesticides, the results of the study have grave implications for future generations. Scientists began their research by exposing rats to atrazine while still in the womb. The parents of these rats were the F0 generation, while their atrazine exposed offspring were F1. Rats in the F1 generation did not exhibit any incidence of disease or adverse health, however they had lower weights than F1 rats in the control group that were not exposed to atrazine. F1 rats were then bred to produce the F2 generation. Although rats in the F2 generation were never exposed to atrazine, they displayed a range of diseases. Males exhibited early onset puberty, diseases of the testis, and mammary tumors. Females exhibited mammary tumors and decreased body weight when compared to […]