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Daily News Blog

Archive for the 'Chemicals' Category


08
Oct

EPA Announces New Scientific Evaluation of Atrazine

(Beyond Pesticides, October 8, 2009) The U.S. Environmental Protection Agency (EPA) announced that it will launch a comprehensive new evaluation of the pesticide atrazine to determine its effects on humans this fall. At the end of this process, the agency will decide whether to revise its current risk assessment of the pesticide and whether new restrictions are necessary to better protect public health. This announcement follows recent scrutiny and findings that the current EPA regulation of atrazine in water is inadequate. In August this year, the Natural Resources Defense Council (NRDC) published a report, Poisoning the Well which found that the commonly used herbicide atrazine can spike at extremely high levels which go undetected by regular monitoring. Concurrently, The New York Times published an investigative piece based on the NRDC findings and confirmed that the public is not informed when reports of these spikes of atrazine in drinking water occur. One of the most widely used agricultural pesticides in the U.S., atrazine can currently legally be applied before and after planting to control broadleaf and grassy weeds. Its increased use to manicure home lawns and gardens has become a serious environmental concern as runoff has had severe health and environmental […]

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07
Oct

EPA Announces Greater Public Participation In Pesticide Registrations

(Beyond Pesticides, October 7, 2009) The U.S. Environmental Protection Agency (EPA) is establishing a new transparent process that will allow the public to review and comment on risk assessments and proposed registration decisions for pesticides. This expanded process will apply to all new pesticide active ingredients and first food uses, first outdoor uses, and first residential uses. It is not clear at this writing whether the agency will at the same time release the underlying test data on potential adverse health effects that companies submit for product registration. Starting October 1, 2009, the public will be able to review and comment on the risk assessments and proposed registration decisions for certain pesticide registration actions. Upon receiving a complete application for registration for a new pesticide active ingredient or a new use of an already registered active ingredient, EPA will publish a Federal Register Notice of Receipt, establish a case docket in regulations.gov, and open an initial 30-day public comment. Following the comment period, EPA will publish its decision and a response-to-comment document. Once the agency’s risk assessments and proposed decision for the registration application are added to the docket, EPA will open another 30-day public comment period. After the final […]

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05
Oct

Review Confirms Atrazine Harms Fish and Amphibians

(Beyond Pesticides, October 5, 2009) An analysis of more than 100 scientific studies conducted on atrazine, published in the online edition of Environmental Health Perspectives, demonstrates the toxicity of atrazine to aquatic animals. Biologists at the University of Southern Florida (USF) have found evidence that atrazine harms fish and frogs. Atrazine is disruptive to the development and behavior of aquatic animals, and negatively effects their immune, hormone, and reproductive systems, according to the studies done by USF assistant professor Jason R. Rohr and postdoctoral fellow Krista A. McCoy. Atrazine is commonly used on lawns, golf courses, and sugarcane fields in Florida, and has recently been the topic of much controversy. While atrazine typically does not kill amphibians and freshwater fish, the USF report says it did: Ӣ Reduce the size of amphibians at or near metamorphosis in 19 of 19 studies. Ӣ Make amphibians and fish more active in 12 of 14 studies but reduced behaviors used to evade predators in six of seven studies. Ӣ Alter at least one aspect of male frogs’ reproductive development in eight of 10 studies. Ӣ Reduce the functioning of animals’ immune systems and often put them at risk of infection. Atrazine, a common […]

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02
Oct

EPA Seeks to Disclose Hazardous Pesticide Inert Ingredients

(Beyond Pesticides, October 2, 2009) The Environmental Protection Agency (EPA) announced that it is moving forward with a plan to disclose the identities of all so-called “inert’ ingredients in pesticides, including those that are potentially hazardous. EPA believes this increased transparency will assist consumers and users of pesticides in making informed decisions and will better protect public health and the environment. Pesticide manufacturers typically disclose their inert ingredients only to EPA. On September 30, 2009, EPA responded to two petitions, one by led by the Northwest Coalition for Alternatives to Pesticides and joined by Beyond Pesticides and 20 other organizations, and a second by certain State Attorneys General, that identified over 350 inert pesticide ingredients as hazardous. The petitioners asked EPA to require these inert ingredients be identified on the labels of products that include them in their formulations. In its response to petitioners, the agency said, “EPA agrees with the petitioners that the public should have a means to learn the identities of hazardous inert ingredients in pesticide product formulations. The agency believes that increased transparency could lead to better informed decision making and better informed pesticide use.” It continues, “EPA will also be discussing ideas to increase disclosure […]

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29
Sep

Children Living Near Agricultural Pesticide Use Have Higher Cancer Rate

(Beyond Pesticides, September 29, 2009) A new study reveals that children exposed to agricultural pesticides applied near their home have up to twice the risk of developing the most common form of childhood leukemia, according to the Northern California Cancer Center (NCCC). The study, “Residential proximity to agricultural pesticide applications and childhood acute lymphoblastic leukemia,” published in the October issue of Environmental Research, used a unique California database to reveal an elevated risk in acute lymphoblastic leukemia (ALL) among children living near applications of certain categories of pesticides used in agriculture. The study, led by Rudolph Rull, Ph.D., shows an elevated risk of ALL associated with moderate exposure, but not high exposure, to pesticides classified as organophosphates (odds ratio (OR) 1.6), chlorophenoxy herbicides (OR 2.0), and triazines (OR 1.9), and with agricultural pesticides used as insecticides (OR 1.5) or fumigants (OR 1.7). California is one of the few states in the country that requires active reporting of pesticide applications, including time, place, and the type and amount of pesticide used. For this study, researchers were able to link children’s entire residential histories from birth to the time of case diagnosis to this pesticide-use reporting database and identify agricultural pesticides that […]

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28
Sep

Genetically Engineered Beets Unlawful

(Beyond Pesticides, September 28, 2009) In a case brought by Center for Food Safety (CFS) and Earthjustice representing a coalition of farmers and consumers, a federal court ruled September 23, 2009 that the Bush Administration’s approval of genetically engineered (GE) “RoundUp Ready” sugar beets was unlawful. In this case, Center for Food Safety v. Vilsack, No. C 08-00484 JSW (N.D. Cal. 2009), the court ordered the U.S. epartment of Agriculture (USDA) to conduct a rigorous assessment of the environmental and economic impacts of the crop on farmers and the environment. The decision follows on the heels of a June 2009 decision from the Ninth Circuit Court of Appeals affirming the illegality of the USDA’s approval of Monsanto’s genetically engineered alfalfa. The federal district court for the Northern District of California ruled that the USDA’s Animal and Plant Health Inspection Service (APHIS) violated the National Environmental Policy Act (NEPA) when it failed to prepare an Environmental Impact Statement (EIS) before deregulating sugar beets that have been genetically engineered (GE) to be resistant to glyphosate herbicide, marketed by Monsanto as Roundup. Plaintiffs CFS, Organic Seed Alliance, Sierra Club, and High Mowing Seeds, represented by Earthjustice and CFS, filed suit against APHIS in […]

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23
Sep

Groups Say Science on Glyphosate Disqualifies It for Reregistration

(Beyond Pesticides, September 23, 2009) On September 21, 2009, Beyond Pesticides, joined by 32 other groups and individuals, submitted comments to the U.S. Environment Protection Agency (EPA) showing new and emerging science which illustrates that glyphosate and its formulated products pose unreasonable risk to human and environmental health, and as such should not be considered eligible for continued registration. EPA opened up the Glyphosate Registration Review for comments on July 22, 2009 with a window for submitting comments extending to September 21, 2009. Beyond Pesticides does not believe that glyphosate should be eligible for registration on the grounds that: human exposures to glyphosate pose unacceptable risks; Roundup formulations are toxic, yet go unevaluated; Food Quality Protection Act (FQPA) 10x (additional margin of safety) factor must be reinstated; Polyethoxylated Tallowamine (POEA) surfactant; glyphosate and Roundup threaten water quality and aquatic life; glyphosate and Roundup-ready crops lead to increasing resistance; and human incidents are too high. As demonstrated in the comments submitted by Beyond Pesticides, herbicide resistance is on the rise. When genetically engineered food products, such as Roundup-ready crops, were commercially developed in the 1990’s, they were sold to the public as a technology that, among other things, would reduce pesticide […]

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21
Sep

Utility Company Sued Over Pollution from Toxic Wood Poles

(Beyond Pesticides, September 21, 2009) In a federal lawsuit filed in San Francisco earlier this month, the environmental watchdog group Ecological Rights Foundation (ERF) claims that dioxin is being discharged from Pacific Gas and Electric Company’s (PG&E) utility poles into the San Francisco Bay, violating both the Clean Water Act and the Resource Conservation and Recovery Act. Dioxin is a contaminant in the wood preservative pesticide pentachlorophenol (penta), the chemical used to treat more than one million PG&E utility poles in Northern California. Dioxin is a known human carcinogen. It also causes birth defects at extremely low levels. The ERF suit asks the court to stop PG&E from discharging dioxin from its utility poles, a move that could eventually lead to wide scale replacement of the ubiquitous penta-treated wood poles. “These are the common, I guess you could say ‘classic,’ brown wood poles you see holding up wires on practically every street,” says ERF attorney Bill Verick. Pentachlorophenol (penta) is a chlorinated aromatic hydrocarbon, closely related to other chlorophenols, hexachlorobenzene, polychlorinated dibenzo-p-dioxins and furans, all of which are found in commercial grade penta, along with secret “inert” ingredients. It was 1978 when EPA began its review of wood preservatives, including […]

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18
Sep

U.S. Geological Survey Identifies Intersex Fish Nationwide

(Beyond Pesticides, September 18, 2009) Previously documented in the Potomac River, which flows through downtown Washington, DC, the occurrence of “intersex” fish is now found to be nationwide. U.S. Geological Survey (USGS) researchers published their study, “Widespread occurrence of intersex in black basses from U.S. rivers” in the online edition of Aquatic Toxicology. USGS researchers examined 16 different species of fish across the U.S. between 1995 and 2004. The condition of intersex fish, male fish producing eggs, is most commonly found in smallmouth and largemouth bass. One third of male smallmouth bass and one fifth of the male largemouth bass are intersex. Scientists tested sites in the Apalachicola, Colorado, Columbia, Mobile, Mississippi, Pee Dee, Rio Grande, Savannah, and Yukon River basins. Research shows intersex fish in approximately one-third of all examined sites. The only site where researchers found no intersex fish is the Yukon River basin. While the study did not look for the causes for intersex fish, scientists believe endocrine disruptors, chemicals that interfere with the body’s hormonal systems, are certainly to blame. “We know that endocrine-active compounds have been associated with intersex in fish, but we lack information on which fish species are most sensitive to such compounds, […]

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16
Sep

Occupational Use of 2,4-D, Permethrin Triple the Risk of Parkinson’s Disease

(Beyond Pesticides, September 16, 2009) A new study published in the September issue of Archives of Neurology reports that the risk of Parkinsonism doubled with increased occupational exposure to pesticides, including eight agents associated with experimental Parkinsonism. These data add to the growing number of studies that lend credence to a causative role of certain pesticides in neurological disorders. The study, “Occupation and Risk of Parkinsonism: A Multicenter Case-Control Study,” set out to investigate occupations, specific job tasks, or exposures and risk of parkinsonism in collaboration with eight movement disorders centers in North America including, the Parkinson’s Institute, CA, Department of Neurology, Baylor College of Medicine and Department of Neurology, Beth Israel Medical Center, New York. The investigation focused on five occupations previously suggested as posing an increased risk of Parkinsonism: agriculture, education, healthcare, welding, and mining. This examination of toxicant exposures included solvents and pesticides putatively associated with Parkinsonism. 519 people with Parkinson’s disease and 511 similar people who did not have Parkinson’s were studied. Overall, the study finds that those whose jobs involve using pesticides are 80 percent more likely to develop the condition. The data reveals that any exposure to the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) almost triples […]

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15
Sep

Under Legal Pressure, EPA Announces New Plan to Protect Salmon from Pesticides

(Beyond Pesticides, September, 15, 2009) On September 11, 2009, the Environmental Protection Agency (EPA) announced plans to place additional limitations on the use of three organophosphate pesticides ”” chlorpyrifos, diazinon and malathion ”” to protect endangered and threatened salmon and steelhead in California, Idaho, Oregon and Washington. The announcement comes in response to a series of lawsuits brought by Pacific Coast Federation of Fishermen’s Associations (PCFFA), the Northwest Coalition for Alternatives to Pesticides, and other salmon advocates, with legal representation from Earthjustice, aimed at removing toxic pesticides from salmon spawning streams throughout the northwest. In response to the litigation, the National Marine Fisheries Service (NMFS) in November of 2008 released a “biological opinion” that set forth a plan for protecting Pacific salmon and steelhead from three toxic organophosphate pesticides. That decision came after almost a decade of legal wrangling between salmon advocates led by Earthjustice and the federal government. The biological opinion prescribed measures necessary to keep these pesticides out of water and to protect salmon populations in Washington, Oregon, California, and Idaho. The announcement from EPA moves this work forward. Although the experts at NMFS recommended prohibiting aerial applications of the three pesticides within 1,000 feet of salmon waters […]

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10
Sep

Studies Show Antiseptic Properties in Cinnamon Oil

(Beyond Pesticides, September 10, 2009) Some researchers are suggesting that sanitizers made with essential oil are a solution to harmful soaps with antibacterials. Cinnamon oil, according to many recent studies, has been shown to have strong antiseptic properties, without creating the problem of antibiotic-resistant bacteria. Many antibacterial products, such as those containing triclosan, work by killing some, but not all bacteria, which means that widespread use has led to resistant strains and cross resistance with antibiotics. A recent study however, found that a cinnamon oil solution was just as effective at killing several common bacteria as many other antiseptics commonly used in hospitals. The team of surgeons conducting the research tested several common essential oils, and found that each has demonstrated promising efficacy against several bacteria, including multi-resistant strains. Another study by researchers in France in 2008 tested bactericidal activity of 13 different essential oils and had similar results, with cinnamon being the most effective. At concentrations as low as 10 percent or less, cinnamon oil was also effective against several antibiotic-resistant strains of bacteria, such as Staphylococcus and E. coli. One pediatrician in New Jersey, Dr. Lawrence D. Rosen, who advocates natural health solutions on his blog, wholechildcenter.org, recommends […]

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08
Sep

Researchers Link Viruses, Genes and Pesticides to Bee Colony Collapse

(Beyond Pesticides, September 8, 2009) Researchers at the University of Nebraska-Lincoln believe they may have determined the first causal relationship linking colony collapse disorder (CCD) to pathogens and other environmental stresses, including pesticides. CCD is a disappearance of honey bees that has beset beekeepers killing off more than a third of commercial honey bees in the U.S. in 2006-2007. Their study, “Changes in transcript abundance relating to colony collapse disorder in honey bees,” was published September 1, 2009 in the Proceedings of the National Academy of Sciences. The team also included researchers from the University of Illinois and the U.S. Department of Agriculture. In a nutshell, the researchers determined, by comparing the differences in gene expression in healthy and CCD colonies, the infected colonies had considerably more damage in their ribosomes. (Ribosomes function in the expression of the genetic code from nucleic acid into protein in all animal, plant and fungal cells.) The infected hives also had higher rates of picorna-like viruses, which damage the ribosome. The researchers believe the loss of ribosomal function leaves the bees susceptible to pesticides and other infections. The honey bee genome project was launched in 2006 by University of Illinois researchers. The new study […]

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04
Sep

EPA Fines Tree Nursery for Pesticide Misuse, Worker Safety Violations

(Beyond Pesticides, September 4, 2009) The U.S. Environmental Protection Agency (EPA) fined a Minden, Nevada-based ornamental tree nursery for misusing pesticides contrary to labeling requirements and failing to comply with federal pesticide worker safety laws. Genoa Tree Nursery misused the pesticide Diazinon AG500 during applications in May and June 2008. The company failed to comply with label directions that require it to minimize the risk of exposure by notifying workers and handlers of recent pesticide applications on particular fields, and failed to provide workers with nearest emergency medical care facility information in case of exposure. The applicator also did not receive safety training during the previous five years as required by law. EPA fined Genoa Tree Nursery a mere $5,440 for these violations. “Notifying employees about potentially harmful pesticide exposure is not just a good idea, it’s the law,” said Katherine Taylor, EPA’s Communities and Ecosystems Division associate director for the Pacific Southwest region. “Employers of agricultural workers must ensure their employees are provided with information and protections that minimize the risk of potential exposure to pesticides””failure to do so is a serious violation.” The Nevada Department of Agriculture discovered the violations during a routine inspection in June 2008. The […]

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02
Sep

Pesticide for Pigeons Kills Dozens of Other Birds

(Beyond Pesticides, September 2, 2009) At least 40 small birds were found dead on Sunday in Quebec City, Canada, in what residents described as a scene out of a “Hitchcock movie.” A bird feeder, stuffed with 4-aminopyridine laced corn was the culprit. The chemical was set out on the roof of a building in effort to ward off nuisance pigeons; dozens of other birds were accidentally killed, particularly bronzed grackles. While Quebec City police purport that this pesticide is legal and no charges will be made, the Quebec Environment Ministry is investigating the incident to see if exterminators followed the proper guidelines. “The wrong type of bird ended up being targeted,” Quebec City police spokeswoman Catherine Viel said. A similar event happened in Schenectady New York in 2006, when Rentokill, Inc., a local exterminator applied 4-aminopyridine in order to ward off pigeons from a hospital. This caused a “deadly rain” of pigeons to fall from the sky, closing the hospital emergency room. One of the most prominent avicides, Avitrol –the trade name for 4-aminopyridine–i s available as grain baits or powder concentrate. It repels birds by poisoning a few members of a flock, causing them to become agitated, which signals […]

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01
Sep

After Deadly Explosion Bayer Reduces Chemical Stockpile to Still Hazardous Levels

(Beyond Pesticides, September 1, 2009) On August 26, 2009, Bayer CropScience announced plans to reduce by 80 percent the storage of methyl isocyanate (MIC), the chemical used in pesticide production that caused the explosion in Bhopal, India and Institute, West Virgina. Two workers were killed in August 2008 when the chemical, an intermediate chemical used in the production of aldicarb, carbaryl, carbofuran, methomyl and other carbamate pesticides, exploded at a Bayer facility in Institute, WV. Thousands died in a Bhopal in 1984. Advocates point out that even if Bayer follows through with its 80% reduction promise, it would still allow up to 50,000 pounds of MIC to be stored on site. This would be similar to the amount of the chemical present in the 1984 Union Carbide (now owned by Dow Chemical) explosion in Bhopal, India. Last summer, when a pesticide tank exploded in West Virginia, comparisons between the site’s potential risk and the Bhopal disaster, in which an explosion and leak killed thousands, were drawn. Currently, the U.S. plant has the capacity to store more up to 40,000 pounds of MIC above ground and 200,000 pounds below ground. Bayer says it will eliminate all above ground storage. Bayer Cropscience […]

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27
Aug

Canadian Medical Association Calls for Ban of Household Products Containing Triclosan

(Beyond Pesticides, August 27, 2009) At its annual convention, the Canadian Medical Association called on the federal government to ban the sale of household antibacterial products such as those containing triclosan. The motion was proposed by Ottawa family physician Kapil Khatter, M.D., who is also president of the Canadian Association of Physicians for the Environment. He says he can understand the appeal of antibacterial products, but in reality they do more harm than good. Strong scientific evidence suggests that pervasive use of triclosan poses imminent threats to human health and the environment, which is why Beyond Pesticides and Food and Water Watch submitted an amended petition a month ago to the U.S. Food and Drug Administration (FDA) seeking to ban the use of the controversial pesticide triclosan for non-medical applications. The petition establishes that FDA’s allowance of triclosan in the retail market violates the Federal Food, Drug and Cosmetics Act. The CMA resolution echoes concerns raised not only by Beyond Pesticides, but also by the American Medical Association (AMA) that date as far back as 2000, citing the lack of studies pertaining to the health and environmental effects of its widespread use. Because no data exists to support the need […]

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26
Aug

Report Finds Inadequate EPA Regulation of Pesticides in Water

(Beyond Pesticides, August 26, 2009) The commonly used herbicide atrazine can spike at extremely high levels which go undetected by regular monitoring, according to new report by the Natural Resources Defense Council (NRDC), Poisoning the Well. Currently, the U.S. Environmental Protection Agency (EPA) considers an annual average atrazine level of below 3 parts per billion to be acceptable for human consumption, although studies have shown adverse health impacts below EPA’s “safe” levels. The analysis by NRDC discovered that in the 139 municipal water systems from which EPA collected data on a biweekly basis in 2003 and 2004, atrazine is found 90% of the time. Furthermore, 54 of these water systems have at least one spike above 3 parts per billion. “The data shows that EPA is unable to adequately regulate atrazine and protect the public from this hazardous herbicide in our drinking water,” said Jay Feldman, executive director of Beyond Pesticides. “With studies showing hormonal and other adverse effects at extremely low levels, any level of atrazine in our drinking water is dangerous and spikes above EPA’s 3 ppb threshold are completely unacceptable. EPA must put public health first and ban this toxic chemical.” Under the federal Safe Drinking Water […]

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21
Aug

Home Pesticide Use Is A Significant Contributor to Water Pollution

(Beyond Pesticides, August 21, 2009) Pesticide use around our homes are an underestimated source of water pollution – leading to more than 50 percent more water pollution than previously believed, according to scientists looking at pesticide use in residential areas in California. The polluted runoff has been linked to fish kills and loss of aquatic species diversity. The findings of a new study were reported earlier this week at the 238th National Meeting of the American Chemical Society in Washington, DC. In the study, Lorence Oki, from the Department of Environmental Horticulture at the University of California Davis, Darren Haver, with University of California Cooperative Extension, and their colleagues explain that runoff results from rainfall and watering of lawns and gardens, which winds up in municipal storm drains. The runoff washes fertilizers, pesticides and other contaminants into storm drains, and they eventually appear in rivers, lakes and other bodies of water. “Results from our sampling and monitoring study revealed high detection frequencies of pollutants such as pesticides and pathogen indicators at all sites,” Mr. Oki said of their study of eight residential areas in Sacramento and Orange Counties in California. Preliminary results of the study suggest that current models may […]

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19
Aug

This School Year, Parents Encouraged to Fight Germs without Hazardous Antibacterials

(Beyond Pesticides, August 19, 2009) As children return to school, health and environmental groups are encouraging parents to protect their children from harmful germs without using hazardous chemicals in lunch bags, school supplies, soaps and sanitizers. The dangers of and alternatives to using triclosan (often marketed as Microban) and the related compound triclocarban, are documented in new educational materials for parents. The factsheet, What’s the right answer to the germ question?, by Beyond Pesticides and Food & Water Watch, pulls together information from various scientific studies documenting the adverse impacts of triclosan on health and the environment, as well as antibiotic and antibacterial resistance. It also provides alternatives, cites Centers for Disease Control (CDC) recommendations for hand washing and disease prevention, and lists triclosan-free brands and retailers. Triclosan is associated with skin irritation or eczema, has been shown to interfere with the body’s hormones, and has been linked to an increased risk of developing respiratory illness, or asthma, and cancer, as well as subtle effects on learning ability. Because the chemical goes down the drain, it also wreaks havoc with the environment, converting to highly toxic dioxins and contaminating waterways and wildlife. Furthermore, by killing some, but not all bacteria, […]

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17
Aug

EPA Long-Term Pesticide Safety Tests Criticized for Falling Short

(Beyond Pesticides, August 17, 2009) The four-day testing period the U.S. Environmental Protection Agency (EPA) commonly uses to determine ”˜safe’ levels of pesticide exposure for humans and animals could fail to account for the long-term effects of toxic chemicals, University of Pittsburgh researchers report in the September edition of Environmental Toxicology and Chemistry. The team found that the highly toxic pesticide endosulfan, a neurotoxin banned in several nations but still used extensively in U.S. agriculture, can exhibit a “lag effect” with the fallout from exposure not surfacing until after direct contact has ended. The findings build on a 10-year effort by Rick Relyea, Ph.D., an associate professor of biological sciences in Pitt’s School of Arts and Sciences, to understand the potential links between the global decline in amphibians, routine pesticide use, and the possible threat to humans in the future. The team exposed nine species of frog and toad tadpoles to endosulfan levels “expected and found in nature” for the EPA’s required four-day period, then moved the tadpoles to clean water for an additional four days, Jones reported. Although endosulfan was ultimately toxic to all species, three species of tadpole showed no significant sensitivity to the chemical until after they […]

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13
Aug

Use of Herbicide Glyphosate Up for Review on Alaskan Railway

(Beyond Pesticides, August 13, 2009) The Alaska Department of Environmental Conservation is currently reviewing a request by the Alaska Railroad for permission to use the herbicide glyphosate along a 90 mile stretch of its track between Seward and Indian. The herbicide is set to be applied on Railroad operating property (rail yards, spurs, sidings, etc) and along the mainline and branch line right-of way for four feet out from both sides of the track in the summer of 2010. Despite the fact that previous requests have been met with opposition, the railroad states that its vegetation problem has gotten too out of hand for “so-called ”˜alternative methods.’” They also state that the Federal Railroad Administration, the railroad’s federal regulatory agency, will impose fines and operational restrictions such as reducing speeds or emergency closures of some sections of track if they aren’t cleared of the overgrown vegetation. Current methods of weed management utilized by the railroad are mechanized rail-based brushcutters, off-rail hydroaxing, wayside manual cutting. The extents to which these methods are used are unknown, however, and the railroad states that these are effective””but only within limited ranges. Beyond Pesticides has an entire factsheet on least toxic control of weeds which […]

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12
Aug

Study Finds that Mosquito Repellent DEET Affects Nervous System

(Beyond Pesticides, August 12, 2009) A new study examining the effects of the mosquito repellent DEET on insects, mice and human proteins reports that the chemical interferes with a prominent central nervous system enzyme. This effect is magnified when exposure to DEET is combined with exposure to certain other pesticides. Entitled, “Evidence for inhibition of cholinesterases in insect and mammalian nervous systems by the insect repellent deet,” and published in BioMed Central (BMC) Biology, the study utilized toxicological, biochemical and electrophysiological techniques to show that DEET is not simply a behavior-modifying chemical, but that it also inhibits cholinesterase activity in both insect and mammalian neuronal preparations. The researchers examined DEET’s effects on mosquitoes, cockroach nerves, mouse muscles, and enzymes purified from fruit flies and humans. Applications of DEET slowed or halted the actions of the enzyme acetylcholinesterase. This enzyme is crucial for regulating nerve impulses in both insects and mammals, and once its functions are disrupted, neuromuscular paralysis, leading to death by asphyxiation result. In humans, symptoms include headache, exhaustion and mental confusion together with blurred vision, salivation, chest tightness, and muscle twitching and abdominal cramps. The study also investigated the consequences of DEET interactions with carbamate insecticides on the […]

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