(Beyond Pesticides, August 3, 2010) A new study shows that due to a flaw in standard risk assessments, which consider toxic effects at fixed exposure times, the risks posed by the neonicotinoid pesticides imidacloprid and thiacloprid are likely to be underestimated. The authors believe that minute quantities of imidicloprid may be playing a much larger role in killing bees over extended periods of time than previously thought. The study, “The significance of the Druckrey—Küpfmüller equation for risk assessment””The toxicity of neonicotinoid insecticides to arthropods is reinforced by exposure time,” was published online July 23, 2010 in the journal Toxicology. The authors believe that standard risk assessment calculations underestimate toxicity because they do not accurately account for the interplay of time and level of exposure. According the study: The essence of the Druckrey—Küpfmüller equation states that the total dose required to produce the same effect decreases with decreasing exposure levels, even though the exposure times required to produce the same effect increase with decreasing exposure levels. Druckrey and Küpfmüller inferred that if both receptor binding and the effect are irreversible, exposure time would reinforce the effect. The Druckrey—Küpfmüller equation explains why toxicity may occur after prolonged exposure to very low toxicant […]

(Beyond Pesticide, June 11, 2010) The Environmental Protection Agency (EPA) has refused the state of Ohio’s request for an emergency exemption to use the restricted pesticide propoxur in residential settings for control of bed bugs, stating that the chemical “presents unreasonable risk.” Propoxur is a highly toxic, broad spectrum insecticide. All indoor residential uses of this known neurotoxic chemical and possible carcinogen were voluntarily canceled in 2007. The Ohio Department of Agriculture, deeming the increases in bed bug infestations an emergency, requested an exemption to use propoxur in residential areas and in May the Ohio Senate’s Environment and Natural Resources Committee adopted a unanimous resolution urging the EPA to grant it. Beyond Pesticides, with coalition of environmental and public health groups, opposed the request and asked EPA to deny the exemption, citing the serious public health threat associated with the chemical, as well as the availability of alternatives. EPA determined “the requested use presents an unacceptable risk,” according to Administrator Lisa Jackson, in a letter to Ohio Governor Ted Strickland dated June 2, 2010. “Although EPA recognizes the severe and urgent challenges that Ohio is facing from bed bugs, the results of the risk assessment do not support the necessary […]

(Beyond Pesticides, March 30, 2010) Searching for clues to the mysterious disappearance of bees, known as “colony collapse disorder”(CCD), Penn State University researchers have identified widespread pesticide contamination of beehives. The study, “High Levels of Miticides and Agrochemicals in North American Apiaries: Implications for Honey Bee Health,” was published March 19, 2010 in the scientific journal Public Library of Science (PLOS). The study finds 121 different types of pesticides within 887 wax, pollen, bee and hive samples from 23 states. The top 10 most frequently detected pesticides are fluvalinate, coumaphos, chlorpyrifos, chlorothalonil, amitraz, pendamethalin, endosulfan, fenpropathrin, esfenvalerate and atrazine. Miticides are the most common contaminant in the wax and bees, and fungicides are the most common contaminant of pollen. For the full results of the study, including several tables of wax, pollen and bee sample data, download the study from the PLOS website. “The pollen is not in good shape,” Chris Mullin, PhD, lead author of the study, told Discovery News. The authors state that the 98 pesticides and metabolites detected in mixtures up to 214 parts per million (ppm) in bee pollen alone represents a remarkably high level for toxicants in the brood and adult food of this primary […]

(Beyond Pesticides, March 10, 2010) A study investigating the sublethal effects of pyrethroids, bifenthrin and deltamethrin on honeybees finds that the chemicals significantly impair the pollinators’ reproduction. The researchers also point out that the concentration of each pesticide that produced adverse effects in the experiments was at or below those that bees could encounter while pollinating treated crop fields. “Effects of sublethal concentrations of bifenthrin and deltamethrin on fecundity, growth, and development of the honeybee Apis mellifera ligustica” published in the March issue of Environmental Toxicology & Chemistry, investigated the effects of the two pesticides at sublethal concentrations on fecundity, growth, and development of honeybees were examined with the feeding method for a three-year period (2006-2008). It was shown that both bifenthrin and deltamethrin significantly reduced bee fecundity, decreased the rate at which bees develop to adulthood, and increased their immature periods. Queens in the control group in 2006 laid a little more than 1,200 eggs each day, compared to not quite 900 a day in the bifenthrin group and roughly 600 per day in the deltamethrin group. In general, the hatch rate of pyrethroid-exposed eggs was also significantly depressed. The success rate of hatchlings, that is the share that […]

(Beyond Pesticides, February 3, 2010) Beyond Pesticides has confirmed exciting additions to Greening the Community, the 28th National Pesticide Forum, scheduled for April 9-10 at Case Western Reserve University in Cleveland, OH. The Forum is an important opportunity to discuss the latest information on pesticides and alternatives, meet scientists and community leaders, and network with other activists working to change policies at the local, state and national levels. David Hackenberg, the beekeeper who first discovered a mysterious disappearance of honeybees now known as colony collapse disorder (CCD), is the most recent addition to the program. Mr. Hackenberg believes that pesticides contribute to CCD and that honeybees are a barometer of the environment. Featured in several films and news investigations, he has been front and center in this important fight to protect our pollinators. Read about Mr. Hackenberg and the other Forum speakers in the highlights below. The Forum will begin Friday afternoon with a tour of the Cleveland Botanical Garden. Founded in 1930, Cleveland Botanical Garden, which is now made up of 20 specialty gardens and exotic indoor biomes, has evolved into a community treasure. The Garden’s community involvement extends beyond its 10 acres into city neighborhoods through its Green […]

(Beyond Pesticides, January 4, 2010) — A pesticide that could be dangerously toxic to America’s honey bees must be pulled from store shelves as a result of a suit filed by the Natural Resources Defense Council (NRDC) and the Xerces Society. In an order issued in December, a federal court in New York invalidated EPA’s approval of the pesticide spirotetramat (manufactured by Bayer CropScience under the trade names Movento and Ultor) and ordered the agency to reevaluate the chemical in compliance with the law. The court’s order goes into effect on January 15, 2010, and makes future sales of Movento illegal in the United States. “This sends EPA and Bayer back to the drawing board to reconsider the potential harm to bees caused by this new pesticide,” said NRDC Senior Attorney Aaron Colangelo. “EPA admitted to approving the pesticide illegally, but argued that its violations of the law should have no consequences. The Court disagreed and ordered the pesticide to be taken off the market until it has been properly evaluated. Bayer should not be permitted to run what amounts to an uncontrolled experiment on bees across the country without full consideration of the consequences.” In June 2008, EPA approved […]

(Beyond Pesticides, November 3, 2009) Research by scientists at the University of Florida (UF) links Colony Collapse Disorder (CCD), the widespread disappearance of honey bees that has killed off more than a third of commercial honey bees in the U.S., to larval exposure to a cocktail of frequently used pesticides. Led by UF Institute of Food and Agricultural Sciences bee specialist Jamie Ellis, PhD, the researchers have finished a first round of testing on bee larvae exposed to the pesticides most commonly found in bee hives. The results were presented on October 22 at a meeting of the North American Pollinator Protection Campaign (NAPPC), which funded the study. The work gives insight into how the larvae react to these pesticides, which are usually only tested on adult bees, and sets the stage for the researchers to test the bees’ reaction to combinations of these pesticides. Just like mixing the wrong medications can have deadly and unpredictable results in humans, chemical mixtures pose a quandary for the bee industry. Bees are commonly exposed to multiple pesticides that are either applied to or nearby their hives. “Beeswax, honey and pollen can contain low mixtures of fungicides, insecticides, and herbicides. The larvae develop […]

(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 […]

(Beyond Pesticides, July 16, 2009) The U.S. Environmental Protection Agency (EPA) has issued a Final Work Plan (FWP) for the registration review of imidacloprid. A neonicotinoid insecticide, imidacloprid is highly toxic to honeybees on an acute exposure basis, and has been implicated in the recent Colony Collapse Disorder (CCD) that has occurred throughout the U.S. Over 12,000 comments were received by the agency since December 2008, urging the agency to suspend the use of this controversial chemical. Imidacloprid was first registered in the U.S. in 1994 as an insecticide to control a range of pests on crops, structures, indoor and outdoor residential areas, as well as pet products. While the use of imidacloprid has been gaining in popularity, its health and environmental effects have not been adequately studied. EPA, with its registration review program, pursuant to the Federal Insecticide, Fungicide and Rodenticide Act (FIFRA) section 3(g), must review each registered pesticide every 15 years to determine whether it continues to meet the FIFRA standard for registration. The public docket for imidacloprid was opened in December 2008 and has since received over 12,000 comments, including those submitted by Beyond Pesticides, NRDC, the National Honey Bee Advisory Board (NHBAB) and Sierra Club, […]

(Beyond Pesticides, April 23, 2009) Pollinators, including honey and bumble bees, butterflies and moths, play an essential role in putting food on our tables through the pollination of many crops and other flowering plants. These insects are susceptible to a variety of disease and environmental threats, including a variety of common pesticides, some of which have increased significantly over the last five to ten years. As a result, the numbers of pollinators have been declining steadily in recent years, with the number of bees in the United Kingdom alone falling by between 10 and 15 per cent over the last two years. This decline has led some to request a ban on certain pesticides suspected of contributing to Colony Collapse Disorder (CCD). To gain a better understanding of why this is happening, some of the UK’s major research funders have joined together to launch an important new research program. The biggest challenge will be to develop a better understanding of the complex relationships between biological and environmental factors which affect the health and lifespan of pollinators. The funding will be made available to research teams across the UK under the Living With Environmental Change (LWEC) partnership, the major initiative by […]

(Beyond Pesticides, September 30, 2008) A group of insect-killing sprays known as neonicotinoids that are widely used in UK farming have now been banned in four other European countries because they are thought to be killing bees. Italy has just joined Germany, Slovenia and France in banning the sprays. This week the Italian government issued an immediate suspension of these sprays after they accepted that they are killing bees. Yesterday, the Britain’s Soil Association (SA) wrote to Hilary Benn, the Secretary of State for the Environment, urging him to ban the sprays in the UK with immediate effect. In the letter, SA Policy Director Peter Melchett wrote, “I fear it is typical of the current extraordinarily lax approach to pesticide regulation in the UK that we look like being one of the last of the major farming countries in the EU to wake up to the threat to our honeybees.” He also stated that the UK’s current pesticide regulation “is too dominated by scientists from one side of the debate about pesticide safety, fails to take adequate account of the public interest as against the interest of the chemical industry and some farmers, and fails adequately to apply the precautionary […]

(Beyond Pesticides, September 18, 2008) New research in the forthcoming issue of Biological Conservation reveals that roadsides maintained “conventionally” with the use of herbicides, non-native fast-growing grasses and frequent mowing support less native bee diversity and abundance than roadsides restored with native plants. Focus on the importance of native bees has increased in light of the recent honeybee crisis. Roadsides restored to native plants could serve as valuable protective corridors of native pollinators, which are threatened by pesticide use and habitat fragmentation. Jennifer Hopwood, PhD, the author of “The contribution of roadside grassland restorations to native bee conservation,” performed the research in Kansas, where a very small amount of unplowed prairie remains. The intensification and spread of agriculture has reduced the availability of suitable nesting sites, particularly for ground-nesting bees, and has limited food sources as a result of reduced floral diversity. Dr. Hopwood found more than twice the bee abundance in roadsides with native plants and increased bee diversity. The restored roadsides have 79 species of bees, whereas the conventionally managed roadsides only have 53. Roadsides in Kansas account for more than 650,000 acres of continuous corridors, which, if restored to native plants, could add significantly to viable bee […]

(Beyond Pesticides, August 28, 2008) The German Coalition Against Bayer Dangers has filed legal action in Germany against Bayer for its role in marketing insecticides that the coalition believes company officials knew were toxic to honey bees. The suit follows recent action by the Natural Resources Defense Council (NRDC) against the Environmental Protection Agency (EPA) to force the agency into compliance with its Freedom of Information Act request for scientific studies relating to clothianidin, one of the Bayer-manufactured pesticides tied to bee toxicity. In May, Germany suspended the approval of eight pesticides linked to a massive bee die-off. Six of the eight suspended are manufactured by Bayer, the other two by Syngenta. Two of the primary active ingredients of concern are clothianidin and imidacloprid, both in the neonicotinoid family of chemicals. They are systemic pesticides, meaning the chemical is incorporated into plant tissue and can therefore be present in pollen and nectar, which is of particular importance to bees. They also have long persistence in the soil and can be absorbed by multiple generations of crops, increasing the likelihood of exposure for bees. Attorney Harro Schultze, who represents the Coalition Against Bayer Dangers said, “The public prosecutor [in Germany] needs […]

(Beyond Pesticides, August 20, 2008) The Natural Resources Defense Council (NRDC) filed a lawsuit on Monday to uncover critical information that the U.S. government is withholding about the risks posed by pesticides to honey bees. NRDC legal experts and a leading bee researcher are convinced that the U.S. Environmental Protection Agency (EPA) has evidence of connections between pesticides and the mysterious honey bee die-offs reported across the country. The phenomenon has come to be called “colony collapse disorder,” or CCD, and it is already proving to have disastrous consequences for American agriculture and the $15 billion worth of crops pollinated by bees every year. EPA has failed to respond to NRDC’s Freedom of Information Act request for agency records concerning the toxicity of pesticides to bees, forcing the legal action. “Recently approved pesticides have been implicated in massive bee die-offs and are the focus of increasing scientific scrutiny,” said NRDC Senior Attorney Aaron Colangelo. “EPA should be evaluating the risks to bees before approving new pesticides, but now refuses to tell the public what it knows. Pesticide restrictions might be at the heart of the solution to this growing crisis, so why hide the information they should be using to […]

(Beyond Pesticides, May 23, 2008) In the midst of dramatically declining bee populations, the German Office for Consumer Protection and Food Safety (BVD) has suspended the approval of eight toxic insecticides believed to be responsible for the fate of these important pollinators. The suspended products include pesticides containing imidacloprid and clothianidin, the majority of which are produced by Bayer Company and have been suspected for years of contributing to declining bee populations.France banned the use of imidacloprid on corn and sunflowers in 1999, and rejected Bayer’s application for clothianidin this year. Despite the call for prohibition of imidacloprid from German apiarists and environmental groups as early as 2004, a crisis in bee populations–a reported 50-60% loss, finally forced the government to take action. The U.S., where these products are still approved for use, has also been experiencing extremely alarming rates of bee colony collapse, while areas away from cropland have thriving bee populations. Imidacloprid and clothianidin are both neonicotinoids, meaning that they target nerve cells in a similar way to nicotine, acting as neurotoxins to sucking insects such as beetles and aphids. Clothianidin was approved for use in the U.S. in 2003 as a seed treatment for corn and canola, […]

(Beyond Pesticides, November 16, 2007) A Pennsylvania beekeeper, John McDonald, has undertaken a study of agriculture’s effect on colony collapse disorder (CCD) of honeybees. After writing an article for the The San Francisco Chronicle that speculates on genetically modified (GM) crops’ contribution to the phenomenon, McDonald spent the last six months producing evidence to support his theory (one of many regarding the causes of CCD). In his original article, McDonald asks, “Is it not possible that while there is no lethal effect directly to the new bees [from GM crops], there might be some sublethal effect, such as immune suppression, acting as a slow killer? . . . Given that nearly every bite of food that we eat has a pollinator, the seriousness of this emerging problem could dwarf all previous food disruptions.” While CCD has been a worldwide concern, there has been minimal research in determining pesticides’ role, particularly regarding proximity to cropland. McDonald writes, “When it appeared that others weren’t interested in this experiment, I undertook to do my own investigation at my own expense.” Beginning in May, McDonald established new colonies (as his had been wiped out earlier), one in Centre County, Pennsylvania, where farming is extensive, […]

(Beyond Pesticides, July 19, 2007) In response to the recent declining bee colony crisis, U.S. Department of Agriculture Under Secretary for Research, Education and Economics Gale Buchanan announced on July 13, 2007 that USDA researchers have finalized an action plan for dealing with colony collapse disorder (CCD) of honey bees, which includes pesticides as a reason for the problem. “There were enough honey bees to provide pollination for U.S. agriculture this year, but beekeepers could face a serious problem next year and beyond,” Buchanan said. “This action plan provides a coordinated framework to ensure that all of the research that needs to be done is covered in order to get to the bottom of the CCD problem.” The action plan coordinates the federal strategy in response to CCD. It addresses four main components: (1) survey and data collection needs; (2) analysis of samples to determine the prevalence of various pests and pathogens, exposure to pesticides, or other unusual factors; (3) controlled experiments to carefully analyze the potential causes of CCD; and (4) developing new methods to improve the general health of bees to reduce their susceptibility to CCD and other disorders. Four possible causes for CCD are identified in the […]

(Beyond Pesticides, June 22, 2007) The U.S. Senate (S.Res. 580) and the U.S. Department of Agriculture has designated June 24-30, 2007 as National Pollinator Week. This week has been designated to recognize the important work of pollinators and their role in ecosystem health. The Pollinator Partnership, sponsored by the North American Pollinator Protection Campaign (NAPPC) and their partners, has put together numerous resources and events all across the country to raise awareness and support for pollinators and pollinator-friendly practices. Pollinators include approximately 200,000 species of beneficial insects such as bees, flies, wasps, butterflies, to name a few, along with vertebrates such as bats, birds and small mammals. Pollination is the process of pollen transfer between flowering plants that leads to fertilization. Without pollination, most plants would be unable to produce fruits or seeds and many of the foods consumed would no longer be available. Pollinators are responsible for pollinating about 75 percent of all crop plants worldwide. This translates to approximately 20 billion dollars worth of food and medicinal products. Other animals and plants also rely on pollinators for food and shelter. Recent studies indicate that these important species are disappearing. Loss of habitat, diseases and the widespread use of […]

(Beyond Pesticides, June 19, 2007) Scientists investigating a mysterious die-off of many of the nation’s honeybees are concentrating on pesticides and microorganisms as possible causes of the disorder, and some beekeepers are refusing to place their hives near chemically treated fields out of fear that pesticides may be contributing to the die-off. Scientists from Penn State University and the U.S. Department of Agriculture are leading the research into the disease, which has killed tens of thousands of bee colonies in at least 35 states. The die-off has threatened the livelihood of commercial beekeepers and strained fruit growers and other farmers who rely on bees to pollinate more than 90 flowering crops, including apples, nuts and citrus trees. After months of study, researchers cannot tie the ailment to any single factor. But scientists have zeroed in on a new, unnamed pathogen found in the dead bees, and on the role of pesticides, said Maryann Frazier, a senior extension associate in the university’s entomology department. David Hackenberg was the first beekeeper to report the disorder to Penn State last fall after losing nearly 75 percent of his 3,200 colonies. He has since rebuilt his business to 2,400 colonies, but now asks growers […]

(Beyond Pesticides, March 1, 2007) In 24 states throughout the country, beekeepers have been shocked to find that bees have been inexplicably disappearing at an alarming rate, according to an article in the New York Times last week. This loss of honeybees threatens not only beekeeper livelihoods but also the production of numerous crops, including California almonds, one of the nation’s most profitable crops. Although the reasons for the honeybee disappearances are unknown, pesticides may be one of the culprits. “I have never seen anything like it,” David Bradshaw, a California beekeeper, said. “Box after box after box are just empty. There’s nobody home.” Last month he discovered that half of his 100 million bees were missing. Beekeepers have fought regional bee crises before, but this is the first national affliction. Bees are flying off in search of pollen and nectar and simply never returning to their colonies. And nobody knows why. Researchers say the bees are presumably dying in the fields, perhaps becoming exhausted or simply disoriented and eventually falling victim to the cold. As researchers scramble to find answers to the syndrome they have decided to call “colony collapse disorder,” growers are becoming openly nervous about the capability […]