(Beyond Pesticides, July 22, 2019) The U.S. Environmental Protection Agency (EPA) will permit the continued use of a known neurotoxic insecticide on the food the Americans eat, the agency announced yesterday in response to a lawsuit filed by public health groups. Health advocates say the move to continue chlorpyrifos use is the latest example of the agency working to protect the profits of industry over the health of Americans. “By allowing chlorpyrifos to stay in our fruits and vegetables, Trump’s EPA is breaking the law and neglecting the overwhelming scientific evidence that this pesticide harms children’s brains,” said Patti Goldman, an attorney for Earthjustice. “It is a tragedy that this administration sides with corporations instead of children’s health.” Under a lawsuit filed in the 9th Circuit US Court of Appeals, EPA had 90 days to provide a justification for why the pesticide should remain on the market. EPA denied the petition yesterday, and rather than providing positive justification for continued use of the chemical, attacked the sound science claimants urged the agency to consider as “not…valid, complete, and reliable.” In the absence of EPA action, several states are leading in the protection of their residents by rejecting the agency’s determination regarding […]

(Beyond Pesticides, May, 7, 2019) Last week, the New York State legislature voted to phase out and eventually ban the use of the neurotoxic insecticide chlorpyrifos. The vote, 44-18 in the state Senate and 94-50 in the Assembly, is still awaiting the Governor’s signature, who is expected to sign the measure. As evidence of harm continues to accumulate, scientists have called for a ban, and a legal case works its way through the courts, pressure is mounting on the U.S. Environmental Protection Agency (EPA) to once and for all remove this harmful pesticide from use. New York’s legislation sets implementation dates that leapfrog a similar law banning chlorpyrifos that passed in Hawai’i last year. Although Hawai’i’s law takes effect beginning in July of this year, the state may provide temporary use permits for the chemical until December 2022. New York also phases in restrictions, first prohibiting aerial applications beginning January 2020, then prohibiting all use except on apple trees starting January 2021. The chemical will be completely banned for use in New York in December 2021. Chlorpyrifos is a highly toxic insecticide that has been linked to damaging and often irreversible health outcomes, particularly for pregnant mothers and their children, […]

(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 4, 2019) Contamination of drinking water with toxic breakdown products and risks to fish and and amphibians has led to a ban on the fungicide chlorothalonil in the European Union (EU). While the pesticide will be out of use in the EU next decade, tens of millions of pounds will continue to be sprayed throughout the U.S. unless regulators take action quickly. “The [chlorothalonil ban] is based on [the European Food Safety Authority’s] EFSA’s scientific assessment which concluded that the approval criteria do not seem to be satisfied for a wide range of reasons,” a spokeswoman for the European Commission told The Guardian. “Great concerns are raised in relation to contamination of groundwater by metabolites of the substance.” EFSA’s review of chlorothalonil categorized it as a 1B carcinogen, meaning it “may cause cancer,” with the most significant risk found for kidney cancer based on laboratory animal studies. Further research was needed into many of the metabolites (break-down substances) created when chlorothalonil degrades. However, regulators determined enough data was present to conclude that these breakdown substances may be genotoxic, with the potential to damage DNA and lead to cancer. European regulators also identified a high acute risk to […]

(Beyond Pesticides, November 29, 2018) The British Cayman Islands will no longer fund the release of genetically engineered (GE) mosquitoes, as reports indicate that the program failed to achieve its intended goals.  The government is formally terminating its contract with the UK-based company Oxitec, which marketed GE mosquitoes as a sort of silver bullet for the management of diseases such as Zika, yellow fever, malaria, and dengue. Advocates opposed to the GE mosquito program are continuing to encourage a focus on education and source reduction as the best method to address mosquito-borne diseases. Oxitec first began introducing its line of GE mosquitoes earlier in the decade, at a variety of locations including India, Brazil, Malaysia, and the Florida Keys. Public opposition to the release has been consistently strong. In the Florida Keys, over 230,000 people signed a change.org petition opposing the release. In the Cayman Islands, residents launched a number of lawsuits. In each instance the company was granted free reign to initiate its program. GE mosquitoes aim to ‘gene drive’ mosquito populations out of existence, a process intended to propagate a particular set of genes in a species. The company developed GE mosquitoes in a laboratory, injecting a gene […]

(Beyond Pesticides, November 21, 2018) A study published last month in the Journal of Apicultural Research finds significant numbers of U.S. honey bees at risk after exposure to hazardous synthetic pesticides intended to control mosquitoes. With many beekeepers rarely given warning of insecticide spraying, researchers say the risk of losing colonies could increase. Advocates say fear of Zika and other mosquito-borne illnesses could result in counterproductive and reactionary insecticide spraying that will add further stress to managed and native pollinators already undergoing significant declines. Researchers aimed to determine whether neighboring honey bee colonies could be similarly affected by aerial insecticide spraying. To calculate the percentage of colonies that could be affected, density of honey bee colonies by county was compared with projections of conditions thought to be prone to regional Zika virus outbreaks. Researchers found 13 percent of U.S. beekeepers at risk of losing colonies from Zika spraying. In addition, it was determined that many regions of the U.S. best suited for beekeeping are also those with favorable conditions for Zika-prone mosquitoes to proliferate. These regions include the southeast, the Gulf Coast, and California’s Central Valley. “[Considering] all the threats facing bees,” says study lead author Lewis Bartlett of the […]

(Beyond Pesticides, November 15, 2018) Neonicotinoids are widely known for their link to declining pollinator populations, but new research finds that the ill effects of these chemicals also extends to amphibian populations. In a study published late last month, scientists from the National Wildlife Research Center in Ottawa, Canada found that chronic exposure to real-world levels of the neonicotinoid imidacloprid limits the ability of juvenile wood frogs to escape a predator attack. This research adds additional evidence that neonicotinoids are harming aquatic food chains, and reinforces calls for U.S. regulators to follow the science and adequately restrict these toxic pesticides. Researchers investigated the impact of neonicotinoids on the post-tadpole life stage of wood frogs, which has been identified as critical to sustaining viable populations of the species. Rather than determine acute impacts that assess how lethal a pesticide is, scientists opted to observe how wood frog behavior changes as a result of chronic, real-world exposure scenarios. In particular, scientists sought to figure out whether exposure resulted in an altered behavioral response to the presence of a predator. As tadpoles, wood frogs were chronically exposed to real world levels of imidacloprid (1, 10, and 100 micrograms/liter), while others were left unexposed […]

(Beyond Pesticides, October 12, 2018) For the first time in its history, the Vermont Department of Environmental Conservation (DEC) denied a permit to apply toxic pesticides to a local waterbody, according to reports from the regional nonprofit organization Toxics Action Center. The DEC decision responded to an application from the Town of Williston, VT to use the herbicide SePRO Sonar AS® on Lake Iroquois, a 237 acre spring-fed body of water used for public recreation, in order to control Eurasian watermilfoil. DEC ruled that use of the herbicide posed risks to the holistic integrity of the lake waters, the Champlain watershed, and surrounding ecology. Sonar contains the active ingredient fluridone, which studies have linked to endocrine disruption, kidney/liver damage and toxicity to fish/aquatic organisms. It has also been identified as a potent groundwater contaminant. With this background, fluridone use has been the subject of public opposition. The permit application submitted by Williston city officials identified $350,000 in costs to apply the pesticide over the next five years, with 3-4 applications scheduled each summer. Milfoil typically takes over shallow coastal waters, out competes native aquatic plants for space and sunlight, reduces oxygen levels and harms fish habitat. Milfoil, like other invasive plants, […]

(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 […]

(Beyond Pesticides, September 8, 2017) Wetlands are important habitats for many creatures, and provide critical environmental services that impact human, economic, and social activity and mosquito management. Wetlands improve water quality, sequester carbon, remove or neutralize pollutants, control flooding, protect adjacent areas from erosion, and host a multitude of beneficial plant and animal species — not to mention their recreational and aesthetic value.As recently reported in The Louisville, Kentucky Courier-Journal, a federally funded project underscores the importance of wetlands in controlling mosquito populations. The Courier-Journal article highlights the construction of 12,000 square feet of new wetlands and marshlands in Louisville. The project was funded with a $9,500 grant from the U.S. Fish and Wildlife Service, and arose from the partnership of the Louisville Metropolitan Sewer District, the Sheltowee Environmental Education Coalition, and a local nonprofit, the Passionist Earth & Spirit Center. Thomas Biebighauser, a wildlife and wetlands biologist, designed the project, which also involved engineering students from the University of Louisville. Impetus for the initiative was in part educational, and in part, a response to the facts that as far back as the 1980s, the area had lost more than 70% of its original wetlands to agriculture and development, and stretches of the nearby […]

(Beyond Pesticides, August 9, 2017) Common toad tadpoles express more venom when chronically exposed to glyphosate herbicides, a study published last month in Proceedings of the Royal Society B indicates. Glyphosate, an increasingly controversial chemical found in Roundup brand herbicides produced by Monsanto, has been linked to a range of adverse impacts in both wildlife and people. The results of this research indicate a need to reduce the use of glyphosate in our environment to ease chronic stressors to sensitive wildlife like amphibians. Scientists tested the effects of formulated glyphosate products on toad tadpoles through experiments in a laboratory setting, as well as a mesocosm, a controlled outdoor environment that replicates natural conditions. Tadpoles in the lab were split into a series of groups which were each exposed to varying levels of glyphosate, some for the duration of the experiment, and others for 9 day periods during different stages in their development. For mesocosm tadpoles, researchers set up large plastic tubs and created small self-sustaining ecosystems with pond water and beech leaves. Glyphosate herbicides were added to certain tubs at either low or high concentrations. Both lab and mesocosm experiments had control tadpoles not exposed to any glyphosate herbicides. Tadpoles […]

(Beyond Pesticides, May 1, 2017) The Florida Keys Mosquito Control District released 20,000 male mosquitoes infected with Wolbachia bacteria near Key West, as a trial strategy to manage mosquitoes that carry Zika and other viruses. The district and others have been exploring new ways to suppress infected Aedes aegypti mosquito populations, which thrive in urban environments and can spread Zika, dengue fever, and chikungunya. It is unclear what impacts, if any, these infected mosquitoes will have on non-target organisms or public health. The trial is the second U.S. test conducted with the naturally occurring Wolbachia bacteria in Aedes aegypti mosquitoes, developed by the Kentucky-based company MosquitoMate. The first test occurred in Clovis, California, last year. In September 2016, the U.S. Environmental Protection Agency (EPA), which registers mosquito control products, approved and expanded an experimental use permit (EUP) for Wolbachia pipientis-infected Aedes aegypti mosquitoes (not to be confused with genetically engineered (GE) mosquitoes).  According to the agency, Wolbachia are naturally occurring bacteria commonly found in most insect species, but not in the Aedes aegypti. This strain of Wolbachia is extracted from Aedes albopictus embryos and microinjected into Aedes aegypti embryos. Male Aedes aegypti mosquitoes are shipped to testing sites where they are released and mate with wild-type Aedes aegypti females that do not carry Wolbachia. After mating, the […]

(Beyond Pesticides, April 5, 2017) A new study, Occurrence of Neonicotinoid Insecticides in Finished Drinking Water and Fate during Drinking Water Treatment, has detected neonicotinoids, a class of insecticides known for their detrimental effects on bees, in treated drinking water. This marks the first time that these insecticides have been found in water sourced straight from the tap. Federal regulators have not yet addressed safe levels of neonicotinoids in drinking water, so at this point, any detection of these chemicals is cause for concern. The study authors “report for the first time the presence of three neonicotinoids in finished drinking water and demonstrate their general persistence during conventional water treatment.” Drinking water samples “collected along the University of Iowa treatment train” over a seven week period, May through July, 2016 directly after corn and soy planting, find three neonicotinoids, clothianidin, imidacloprid, and thiamethoxam at levels ranging from 0.24 to 57.3 ng/L (nanogams per liter). The University of Iowa tap water is run through a water treatment plant that uses conventional treatment methods.  In contrast, the Iowa City water treatment methods (granular activated carbon filtration) result in substantially lower levels of the neonicotinoids. Additionally, the researchers found that extensive transformation of clothianidin […]

(Beyond Pesticides, March 10, 2017) A French study published last week has found that higher pesticide use does not mean larger profits, demonstrating that farmers can reduce their usage of pesticides without worrying about their profits being affected, in most cases. Similar studies have shown that organic and conventional yields are comparable, supporting the case for farmers to transition from high pesticide use to healthier, safer, and more profitable alternatives. The study, led by Martin Lechenet, a PhD student with the French National Institute for Agricultural Research, looked at data from 946 French farms, including yields, pesticide application rates, soil characteristics, and local climate conditions. The researchers then used a model to focus on the relationship between pesticide application rates and productivity or profitability. They found that, in 77% of the farms, higher pesticide use was not linked to a higher profit. The researchers then estimated that pesticide use could be reduced by 42% without any negative effects on current profit levels in 59% of farms in their national network. According to the researchers, their results demonstrate the ability to reduce pesticide usage for most farmers in current production situations. In addition, other studies support the finding that farmers do not have […]

(Beyond Pesticides, March 6, 2017) A study published last month by Canadian researchers finds that exposure to the neonicotinoid insecticide imidacloprid at environmentally relevant levels results in slight delays in metamorphosis in the tadpoles of the wood frog. While the authors find that this slight delay is not necessarily a cause for concern from an ecological perspective, sublethal effects of pesticide mixtures and a variety of stressors in the environment play a role in extending juvenile periods in frogs, which can increase mortality and population decline. Because neonicotinoids are so widely use, the authors recommend further research on their impact on declining frog populations. The study, published in Environmental Toxicology and entitled, “Sublethal effects on wood frogs chronically exposed to environmentally relevant concentrations of two neonicotinoid insecticides,” looks at the chronic exposure effects of the neonicotinoids imidacloprid and thiamethoxam on the wood frog (Lithobates sylvaticus). The wood frog was chosen because it is native to North America and has a wide distribution across the continent. The researchers exposed tadpoles to environmentally relevant concentrations (1ug/L, 10ug/L and 100ug/L) of the commercial formulation of the neonicotinoids (Admire and Actara). The study finds a significant difference in time for tadpoles to metamorphose. Tadpoles exposed […]

(Beyond Pesticides, January 23, 2017) Last week, the U.S. Environmental Protection Agency (EPA)  released its final Biological Evaluations of Three Chemicals’ Impacts on Endangered Species, which finds that chlorpyrifos and malathion likely have detrimental effect on 97 percent of all species listed and protected under the Endangered Species Act (ESA), while diazinon adversely affects 78 percent. According to EPA’s release on the subject, this is the “first-ever draft biological evaluations analyzing the nation-wide effects” of these registered chemicals on endangered species after decades of widespread use. The evaluations stem from a legal settlement with the Center for Biological Diversity (CBD) in which CBD sued EPA in April 2014 for its failure to comply with ESA, which requires the agency to carry out consultations with federal wildlife agencies while registering pesticides. According to Nathan Donley, Ph.D., a CBD senior scientist, “We’re now getting a much more complete picture of the risks that pesticides pose to wildlife at the brink of extinction, including birds, frogs, fish and plants. When it comes to pesticides, it’s always best to look before you leap, to understand the risks to people and wildlife before they’re put into use. The EPA is providing a reasonable assessment of those risks, many of which can be […]

(Beyond Pesticides, January 3, 2017)  A study published in December 2016 in Environmental Contamination and Toxicology, entitled The Effect of Atrazine on Louisiana Gulf Coast Estuarine Phytoplankton, finds that phytoplankton in estuaries in close proximity to agricultural operations are less productive than phytoplankton in an uncontaminated environment. The study examines three different estuaries of the Mississippi river in Louisiana and also evaluates microcosms with different concentrations of atrazine. Phytoplankton, incredibly important to estuary ecosystems and aquatic life, are an integral part of the aquatic food web and ultimately critical to the wild seafood market. As photosynthetic microorganisms, phytoplankton harness the sun’s energy for metabolism and create as a byproduct of photosynthesis dissolved oxygen, which oxygen-breathing sea life require. For the study, the researchers created microcosms, or large containers that are able to closely mimic ecosystems, so that they can observe the effects of independent variables. On average, phytoplankton in the microcosms are less productive at producing chlorophyll a in the presence of atrazine. The microcosm study design is important because it is difficult to separate and measure the effects of chemicals like atrazine in the environment, given the range of potential causes of phytoplankton decline. A variety of factors, like freshwater discharge rates, precipitation, […]

(Beyond Pesticides, November 15, 2016) Last week, the U.S. Environmental Protection Agency (EPA) updated its assessment of the toxic organophosphate insecticide chlorpyrifos, keeping in place a decision made last year to revoke food residue tolerances and effectively eliminate its use in agriculture. The agency indicated the change was necessary after a Scientific Advisory Panel convened by the agency suggested additional data to support its decision. This change opens up a 60-day public comment period, but EPA has said that it will make a final decision no later than March 31, 2017. “The revised analyses indicate that expected residues of chlorpyrifos on food crops exceed the safety standard under the Federal Food, Drug, and Cosmetic Act (FFDCA),” EPA noted in its announcement.  “In addition, the majority of estimated drinking water exposures from currently registered uses, including water exposures from non-food uses, continue to exceed safe levels even taking into account more refined drinking water exposures. “ To explain the decision to the public, EPA has put together a FAQ page on its website. EPA’s proposal to revoke chlorpyrifos’ food tolerances stems from a petition and lawsuit filed by the Natural Resources Defense Council and Pesticide Action Network North American nearly ten […]

(Beyond Pesticides,  November 7,  2016) In a letter  last week on the widely used weedkiller  atrazine, Rep. Ken Buck (R-CO) and 105 of his colleagues told Gina McCarthy, administrator of the U.S. Environmental Protection Agency (EPA), that, “It would be irresponsible to greatly restrict one of the safest and most trusted herbicides on the market.” The  letter was triggered by EPA’s release in June of its  draft  Ecological Risk Assessment on atrazine, which found levels of concerns exceeded by as much as 200-fold for some organisms. Lawmakers indicated that the draft assessment in its present form, “Would have a significant impact on farmers and rural communities nationwide.” Despite a wealth of information to the contrary, they claim that restricting the use of atrazine would put an unnecessary financial burden on farmers. Atrazine, produced by Syngenta,  is the second-most widely used pesticide in the U.S., with over 73 million pounds applied each year. While Rep. Buck claims that atrazine is a safe chemical, years of research shows that the chemical poses unacceptable risks to human health and the environment.  Once applied, the chemical often washes into surface water and leaches into groundwater. Water contamination issues spurred community water utilities  across the […]

(Beyond Pesticides, October 11, 2016) Last week, in a calculated attack on the International Agency for Research on Cancer’s (IARC), the U.S. House of Representatives’ Committee on Oversight and Government Reform summoned the National Institutes of Health (NIH) to answer questions about taxpayer contributions to the World Health Organization’s (WHO) cancer agency. From reports, it is easy to gather that the committee has problems with IARC scientists’ findings that glyphosate, among other things, is a probable  carcinogen. Led by Chairman Jason Chaffetz (R-UT), the hearing is  clearly aimed at  undermining IARC’s March 2015 listing of glyphosate as a probable carcinogen based on sufficient evidence of carcinogenicity  found in laboratory studies. Set to take place in private, limiting any opportunity for public oversight, the hearing will consist of NIH officials answering questions on the scientific processes and public funding from politically-charged committee investigators. If Rep. Chaffetz is persuasive in this rouse against science, he stands to put in jeopardy  a significant amount funding for IARC provided by NIH, a devastating outcome for individuals who value the importance of IARC’s work in the scientific community. Glyphosate, which is produced and sold as RoundupTM  by Monsanto, has been touted by industry and EPA […]

(Beyond Pesticides, September 2, 2016) Last Sunday, beekeepers in Dorchester County, South Carolina emerged from their homes to find their yards and  farms, once full of busy buzzing, littered with the honey bees. The cause was no mystery — a massive bee-kill had occurred due to aerial spraying of Naled, a highly toxic  insecticide used primarily to control adult mosquitoes. The county announced plans to spray two days before the incident, when four travel-related cases of Zika virus were confirmed in the area by the state Department of Health and Environmental Control. The spraying occurred between 6:30 and 8:30am. Naled is an organophosphate insecticide with the highest acute toxicity of any mosquitocide. According to the Environmental Protection Agency (EPA), Naled can cause cholinesterase (an enzyme necessary to the transmission of nerve impulses) inhibition in humans, meaning that it can overstimulate the nervous system causing nausea, dizziness, confusion, and, at very high exposures (e.g., accidents or major spills), respiratory paralysis and death. Naled is highly toxic to honey bees. In Dorchester County, beekeepers say that the spray announcements did not come soon enough. Flowertown Bee Farm and Supply lost more than 2.3 million insects from 46 hives, according to co-owner Juanita […]

(Beyond Pesticides, August 5, 2016) Concerned health officials in Miami, Florida are investigating suspicions that Zika-spreading mosquitoes have become resistant to the pesticides commonly used synthetic pyrethroid insecticides used in mosquito control. As the region works to contain a Zika outbreak in northern Miami, officials are beginning to recognize that broadcast pesticide applications are not effective at controlling populations, and are looking into cases in the U.S.  and in other parts of the world of mosquitoes developing resistance to chemical controls, or whether other factors are at work. At the same, the broadcasting of the pesticides by truck and plane and the resulting exposure to people and the environment also raise serious health issues. The Aedes aegypti mosquito, which has the ability to live indoors and reproduce even in tiny pools of water, is the primary way the Zika virus is spread, although there are reports that the disease can also be transmitted through sexual contact. Zika virus has been linked to cases of microcephaly, in which babies are born with underdeveloped brains. The virus has been detected in several Latin American countries, including Brazil where the outbreak was first observed and linked to increased cases of microcephaly. However, locally […]