(Beyond Pesticides, February 13, 2014) French scientists from the University of Caen have revealed one more layer of the myth behind so-called “inert” ingredients in pesticides, concluding that pesticide risk assessments that focus exclusively on active ingredients substantially underestimate the potential hazards of the product as a whole. The findings in Major pesticides are more toxic to human cells than their declared active principles indicate that inert ingredients in pesticides can magnify the effects of active ingredients, sometimes as much as 1,000-fold. In conducting their study, Robin Mesnage,  Ph.D.  and  his team of scientists, including Gilles-Eric Seralini,  exposed three human cell lines to the active ingredients of three herbicides, three insecticides, and three fungicides. The team then exposed the cell lines to the well-known commercial formulations that include these active ingredients which also contained “inerts,” and compared the results. Overall the study concluded that the commercial combinations had a magnifying effect on the toxicity of the active ingredients. While many might assume  that three insecticides tested ranked highest in toxicity, the study actually ranked fungicides as having the highest on-average toxicity, followed by herbicides, then insecticides. Leading the pack for on-average toxicity in the herbicides was the well-known Monsanto product, […]

Thousands participate in bee swarm actions across the country on Valentine’s week (Beyond Pesticides, February 12, 2013) ”” This week, over 27,000 people coast-to-coast are swarming Lowe’s and Home Depot stores to support the bees that pollinate our flowers for Valentine’s Day. In a coalition campaign called the Bee Week of Action, Beyond Pesticides, Friends of the Earth and allies are delivering more than half a million petition signatures and Valentines asking these retailers to show bees some love by taking off their shelves pesticides shown to harm and kill bees —and garden plants treated with these pesticides. Beyond Pesticides is partnering with Friends of the Earth U.S., Beelieve, Beyond Toxics, Center for Food Safety, CREDO Mobilize, Friends of the Earth Canada, Northwest Center for Pesticide Alternatives, Organic Consumers Association, Pesticide Action Network, SumOfUs and the Xerces Society for Invertebrate Conservation to turn out activists across the country, including larger actions in Chicago, Washington, D.C., Minneapolis, the San Francisco Bay Area, Boston area, and Eugene, Ore. For a listing of cities participating in action, click here. This national week of action is a part of a retail campaign that is calling on retailers to stop selling neonicotinoids —the most widely […]

(Beyond Pesticides, February 11, 2014) In the midst of another tough winter for bees across the globe, scientists reveal new research showing that exposure to neonicotinoid pesticides causes a 57% reduction in the amount of pollen bumblebees are able to collect for their colony. The new evidence on these systemic pesticides, “Field realistic doses of pesticide imidacloprid reduce bumblebee pollen foraging efficiency,” published in the journal Ecotoxicology, documents a decline in pollen gathering abilities at extremely low doses that bees are likely to encounter in the field. Researchers found that the effects of neonicotinoid intoxication persist for a least a month after exposure, underscoring the long-term damage these chemicals can cause to bee colonies. Hannah Feltham, PhD, research student and co-author of the study, remarked, “This work adds another piece to the jigsaw. Even near-infinitesimal doses of these neurotoxins seem to be enough to mess up the ability of bees to gather food. Given the vital importance of bumblebees as pollinators, this is surely a cause for concern.” After being exposed to “near-infinitesimal” amounts of the neonicotinoid imidacloprid through pollen and sugar water (6 parts per billion and .7 parts per billion, respectively), bumblebees were outfitted with Radio Frequency Identification […]

(Beyond Pesticides, February 10, 2014)    A recent study has found that exposure to pyrethroids is increasing among children and adults. The study also finds that children are still widely exposure to chlorpyrifos, an organophosphate chemical that has been banned for household use for over 12 years. This is not the first study to find high concentrations of pyrethroids in residential, but it may be the first to evaluate correlations between pesticide dust concentration and concentration of pesticides in children’s urine. The study, Urinary Pyrethroid and Chlorpyrifos Metabolite Concentrations in Northern California Families and Their Relationship to Indoor Residential Insecticide Levels,  conducted by researchers at the University of California, Davis, analyzed urine samples from 90 adults, 83 children, and 88 floor wipe samples from participants’ kitchen floors. The participants were 90 northern Californian families who had children born between 2000 and 2005, with the samples collected from 2007-2009.   These samples were analyzed for concentrations of pyrethroids, pyrethroid metabolites, chlorpyrifos, and chlorpyrifos metabolites.  The study found pyrethroid metabolites in 63 percent of all urine samples with concentrations twice as high as levels reported in a national 2001-2002 study. In children, higher concentrations of pyrethroids found in floor wipes were associated […]

(Beyond Pesticides, February 7, 2014) Flying in the face of  recent science demonstrating that pollinator populations are declining, the U.S. Environmental Protection Agency (EPA) has made the decision to unconditionally register another pesticide that is known to be highly toxic to bees, coming almost one year after EPA registered sulfoxaflor, disregarding concerns from beekeepers and environmental groups. The announcement, posted in the Federal Register on Wednesday, set tolerances for the pesticide cyantraniliprole in foods ranging from almonds and berries, to leafy vegetables, onions, and milk. EPA establishes the allowable limit of the chemical residue, called tolerances, based on what EPA considers ”˜acceptable’ risk.  EPA’s ruling details that “there is a reasonable certainty that no harm will result from aggregate exposure to the pesticide residue,” despite all evidence that cyantraniliprole is toxic to bees and harmful to mammals. Ignoring beekeeper warning and concerns on their impacts to bees, EPA has given the green light for cyantraniliprole after recently registering sulfoxaflor.  In July 2013, beekeepers filed suit against EPA for their decision to register sulfoxaflor when it failed to demonstrate that it will not cause any ”˜unreasonable adverse effects on the environment’ as required by the Federal Insecticide, Fungicide, and Rodenticide Act […]

(Beyond Pesticides, February 6, 2014) We know that pesticides and bees don’t mix and that particular pesticides, such as neonictinoids, pose significant threats to bee populations worldwide, but a recent study conducted by researchers at Pennsylvania State University have identified that it is “the mix” of the many chemicals in the environment that pose a significant threat to honey bee survival. Looking at the four most common pesticides detected in pollen and wax –fluvalinate, coumaphos, chlorothalonil, and chloropyrifos, Wanyi Zhu and other researchers have assessed the toxic impacts of these pesticides on honey bee larvae at real world exposure levels; that is, levels that are found in existing hives outside of a laboratory. But these researchers go beyond the usual one-chemical analysis in their study,  Four Common Pesticides, Their Mixtures and a Formulation Solvent in the Hive Environment Have High Oral Toxicity to Honey Bee Larvae. Rather than just looking at the pesticides in their individual, out-of-the-bottle form, they also mixed them up and broke them apart. Why did they take this mixed-up approach? “Recently, one hundred and twenty-one different pesticides and metabolites were identified in the hive with an average of seven pesticides per pollen sample, including miticides, insecticides, […]

(Beyond Pesticides, February 5, 2014) According to a new study published in Environmental Health Perspectives, chemical contaminants in waterways that mimic estrogen -endocrine disruptors- target developing heart valves in fish and impair the growth of fish hearts. The study illustrates that these hormone-mimicking compounds, which include some pesticides, pharmaceuticals, and other household chemicals often found in sewage effluent and runoff that flows into waterways, are being linked to mounting science that show serious human and environmental adverse effects. Researchers from the Fish Health Branch of the U.S. Geological Survey (USGS) and the Carnegie Institution for Science exposed zebrafish embryos to water from 19 sites in the Susquehanna, Delaware, Allegheny and Shenandoah watersheds. Water from 16 of the sites triggered proteins in the fish that were estrogen receptors, indicating that the rivers contained endocrine disrupting chemicals. These receptors are attached to DNA, which turn genes on and off. While such activity is common in the liver, this is the first experiment to show estrogenic activity in heart valves. “This tells us that endocrine-disrupting chemicals could lead to improper heart development. We were quite surprised, since this is something that others hadn’t observed before,” said study co-author Luke Iwanowicz, PhD, and research […]

(Beyond Pesticides, February 4, 2014) No strawberries, no honey — without bees Valentine’s Day just wouldn’t be the same. In fact, one out of three bites of food depend on honey bee pollination, but they are in danger from the use of neonicotinoid pesticides that Europe has already banned. We know bees can’t wait any longer for increased protections, so we need to take a stand wherever we can. That’s why we’re asking you to join thousands of people coast-to-coast to swarm Home Depot and Lowe’s stores the week of Valentine’s Day (February 10-16). We’ll be delivering valentines, asking these stores to “show bees some love” and stop selling bee-killing pesticides and garden plants poisoned with these harmful chemicals. Planting season is right around the corner. We can’t let another year pass with Home Depot and Lowe’s selling “poisoned plants” with no warning to consumers. Last year U.S. beekeepers reported a 30-100 percent loss of their hives, and right now they are likely facing another winter of historic bee die-offs. You can help BEE Protective of pollinators during another tough winter season by delivering a Valentine to retailers. We’ve made it easy: Sign up here and we’ll send you a […]

(Beyond Pesticides, February 3, 2014) Prompted by the prolific threat of contamination of organic agriculture by genetically engineered crops, the Organic Seed Growers and Trade Association (OSGATA) recently published a comprehensive guide to help  organic seed growers maintain the integrity of organic seed. The publication comes just weeks after the U.S. Supreme Court ruling to limit the ability of farmers to legally defend themselves against genetic drift in a landmark federal lawsuit OSGATA et al. vs. Monsanto. The publication, entitled Protecting Organic Seed Integrity, provides organic farmers, seed handlers, and seed companies an array of resources they can employ to maintain organic integrity through crop specific, scale-appropriate strategies. In addition, the handbook provides guidance on testing protocols for crops that are particularly risky, that is, crops with GE counterparts that are approved by the U.S. Department of Agriculture, including corn, soy, cotton, alfalfa, canola, sugar beets, and squash. “The risk to organic farmers by GE contamination is real,” said Maine organic seed farmer, Jim Gerritsen, OSGATA President. “Organic farmers continue to be failed by the government. This new handbook is an important tool for farmers to protect themselves and the organic seed supply.” With widespread planting of genetically engineered crops, […]

(Beyond Pesticides, January 31, 2014) Michael Skinner, Ph.D.,  author of the landmark study that links exposure to the insecticide DDT with multi-generational effects, ultimately contributing to obesity three generations down the line, is joining an impressive array of speakers at Beyond Pesticides’ 32nd National Pesticide Forum, April 11-12 in Portland, Oregon. Dr. Skinner’s groundbreaking research on transgenerational effects of pesticides has created quite a stir within the scientific community and backlash from the industry. A professor in the School of Biological Sciences at Washington State University, Dr. Skinner has published over 240 peer-reviewed publications and has given over 237 invited symposia, plenary lectures and university seminars. His  research focuses on the investigation of gonadal growth and differentiation, with emphasis in the area of reproductive biology. His current research has demonstrated the ability of environmental toxicants to promote the epigenetic transgenerational inheritance of disease phenotypes due to abnormal germ line epigenetic programming in gonadal development. Science Magazine has dubbed Dr. Skinner “The Epigenetics Heretic.” The article, published January 24, explores the controversy surrounding his recent findings, industry challenges to his research,  as well as the significance: “To those who don’t flatly dismiss Skinner’s findings, he has raised a tantalizing glimpse of […]

(Beyond Pesticides, January 30, 2014) With the U.S. House of Representatives’ passage of the Agriculture Act of 2014 (commonly known as the Farm Bill) yesterday, conventional farming allies and chemical agribusiness dealt a dangerous blow to children’s health protections and offered up yet another reason for consumers everywhere to support organic. The behind-closed-door amendment to the Farm Bill that appeared in neither the pre-conference House or Senate-passed versions of the Bill available to the public, orders the U.S. Environmental Protection Agency (EPA) to ignore its ruling that levels of fluoride left in food treated with the toxic fumigant sulfuryl fluoride are unsafe for consumers everywhere, especially children and infants. Looking at the Numbers Under the Food Quality Protection Act (FQPA), a law designed to provide stronger protections for infants and children from pesticides, EPA must consider the aggregate dose that children receive from pesticide residues along with the other “nonpesticidal” sources. In the case of sulfuryl fluoride, a fumigant used in closed structures such as barns, storage buildings, commercial warehouses, ships in port, and railroad cars and thus also found on their stored contents like grains and other crops, this is an important consideration because other sources of fluoride abound […]

(Beyond Pesticides, January 29, 2014) People with high levels of exposure to the banned insecticide DDT are four times more likely to have Alzheimer’s disease than people with low levels, according to a new study of patients in Georgia and Texas. The research is among the first to report a connection between Alzheimer’s disease, which is the world’s most common neurodegenerative disease, and chemicals in the environment. The traces of the insecticide found in the study’s Alzheimer’s patients are comparable to the amounts found in most Americans today. Although it was banned more than 40 years ago in the U.S., DDT still persists in the environment worldwide and is still used today in developing countries for malaria abatement programs. “Our findings suggest that genetically susceptible individuals with higher levels of DDT exposure may be more at risk,” said Jason Richardson, PhD, a Rutgers University researcher who led the study. The case-control study consisting of existing samples from patients with Alzheimer’s disease and control participants from the Emory University Alzheimer’s Disease Research Center and the University of Texas Southwestern Medical School’s Alzheimer’s Disease Center measured serum levels of DDE in 79 control and 86 Alzheimer’s disease cases. Levels of DDE, a […]

Beyond Pesticides, January 28, 2014) In the latest attempt to suppress the voice of local communities and scuttle the implementation of laws to protect health and the environment, last week a bill was introduced in the Hawaii State House of Representatives that will preempt (block) local governments from restricting the use of hazardous pesticides and genetically engineered (GE) crops. Though House Bill 2506 is being promoted as the expansion of the state’s “Right-to-Farm Act,” the bill will prevent the implementation of new laws recently passed in Kauai and Hawaii County. Kauai Councilman Gary Hooser explained to The Garden Island, “Both of these bills take away 100 percent of the authority of the county to regulate agriculture, which includes pesticides. It is without question an attempt to nullify Ordinance 960 (formerly Bill 2491), as well as the ordinance passed on the Big Island.” Local communities in the Hawaiian Islands fought a number of hard-won battles last year against intrusions by agrichemical companies spraying pesticides and planting GE crops near where they work, live, and go to school. After massive outpourings of public support, numerous late-night council sessions, and overcoming a mayoral veto, Kauai County passed Bill 2491. Kauai’s Ordinance 960 requires […]

(Beyond Pesticides, January 27, 2014) During the worst drought that California has seen in 100 years , goats are being used to clear brush, a fire hazard,  on several acres  of city property in Anaheim, California. This is not the first city in California to use goats to limit the dangers of wildfires; Auburn California also used them last September. Goats are an extremely efficient way to clear brush and are used in many landscape settings beyond fire hazardous brush. During the week of January 13-17, Anaheim Fire and Rescue and the Department of Public Works contracted Environmental Land Management to clear six acres of brush along a right-of-way  using close to 100 goats. This method of ecological brush control was specifically chosen because it is a safer way to eliminate the wildfire dangers that dry brush can create.   Other common methods of brush control, such as mowing, can cause problems in dry conditions by creating sparks and inadvertently start fires. The goats were also used in hilly areas of East Anaheim, which are difficult to clear using mowers. This method of brush clearing is extremely efficient and contracting goats cost the city only $5,000 dollars, one-third less than […]

(Beyond Pesticides, January 25, 2014) U.S. Representative Peter DeFazio (D-OR) joined other members of Congress, along with more than 200 businesses and organizations, including Beyond Pesticides, in petitioning President Obama to adopt labeling requirements for genetically engineered (GE) foods. The letter encourages the president to fulfill his campaign pledge made in 2007 to require the Food and Drug Administration (FDA) to adopt a national mandatory labeling system. “It’s time the FDA’s policies reflected 21st century food technologies,” said Rep DeFazio in a press conference last Thursday. “After all, twenty years ago they didn’t have corn that could produce its own insecticides.” In April 2013, Rep. DeFazio and Senator Barbara Boxer (D-CA) introduced bipartisan legislation that requires FDA to label GE food, under the proposed Genetically Engineered Food Right-to-Know Act. The bill now has 50 cosponsors. “Two state legislatures have already approved GE labeling and more than 20 other states are considering GE labeling laws,” the letter reads, referring to the GE labeling laws passed in Connecticut and Maine. “Plain and simple, this is about consumer rights,” said Rep. DeFazio. “People should have the ability to make an informed choice about what they feed their family and we know it’s not […]

(Beyond Pesticides, January 23, 2014) Putting ideas into action, an Oregon-based restoration nonprofit group, Ocean Blue Project, is harnessing the power of mushrooms to clean up pesticides and other pollutants that plague Oregon and national waterways. Yes, mushrooms. The test project launched Sunday, January 19 on the banks of Sequoia Creek, a tributary to the Willamette River. Using recycled burlap bags filled with used coffee grounds, straw, and yellow oyster mushroom spawn, the purpose of the unusual potpourri will be to harness the extremely effective filtering capabilities of mycelium. A kind of root system for fungi, mycelium demonstrate a wide variety of biological powers, from breaking down oil, pesticides, and harmful bacteria to acting as natural pesticides against some of the most problematic pests. Paul Stamets, a leading expert on the power of mushrooms and former speaker at Beyond Pesticides’ National Pesticide Forum in 2006, has a word for the natural properties of fungi to fight human-made pollution: mycorestoration. As Mr. Stamets explained to Discover Magazine in 2013, “Oyster mushrooms, for example, can digest the complex hydrocarbons in wood, so they can also be used to break down petroleum byproducts. Garden Giants use their mycelia to trap and eat bacteria, […]

(Beyond Pesticides, January 22, 2014)  Exposure to a widely used pesticide causes worker bumblebees to grow less and then hatch out at a smaller size, according to a new study by Royal Holloway University of London. The research, published this week in the Journal of Applied Ecology, reveals that prolonged exposure to a pyrethroid pesticide, which is used on flowering crops to prevent insect damage, reduces the size of individual bees produced by a colony. The researchers, Gemma Baron, Dr Nigel Raine and Professor Mark Brown from the School of Biological Sciences at Royal Holloway worked with colonies of bumblebees in their laboratory and exposed half of them to the pesticide. The scientists tracked how the bee colonies grew over a four month period, recording their size and weighing bees on micro-scales, as well as monitoring the number of queens and male bees produced by the colony. “We already know that larger bumblebees are more effective at foraging. Our result, revealing that this pesticide causes bees to hatch out at a smaller size, is of concern as the size of workers produced in the field is likely to be a key component of colony success, with smaller bees being less […]

(Beyond Pesticides, January 21, 2013) Two Minnesota state agencies are creating plans they say will  address declining pollinator populations in the state. The Minnesota Department of Natural Resources (DNR) is developing best management practices for managing and increasing pollinator habitat and the Minnesota Department of Agriculture (MDA) is developing a plan to study the impacts of neonicotinoid pesticides on pollinators. Critics of the state’s plan say that there is no more need to study the effects of neonicotinoids because the negative impacts they have on pollinators has been already studied extensively.   The DNR is developing guidelines to improve habitat for pollinator insects. Recent reports show that  the planting of herbicide-resistant genetically engineered (GE) crops is responsible for habitat loss and the decline of native pollinators like the Monarch butterfly. The expansion of glyphosate tolerant GE corn and soybean cropland has allowed farmers to kill milkweed, the primary source of food for Monarchs, which historically grew between crop rows in the Midwest. A rapid expansion of farmland ””more than 25 million new acres in the U.S. since 2007”” has also eaten away grasslands and conservation reserves that supplied the Monarchs with milkweed. DNR officials have indicated this guide could change […]

(Beyond Pesticides, January 17, 2014) A new economic study, Would banning atrazine benefit farmers?, published in the International Journal of Occupational and Environmental Health demonstrates that eliminating the herbicide atrazine, widely used on U.S. corn crops, will economically benefit corn growers. The study examines the research produced by the Atrazine Benefits Team (ABT), a group assembled by atrazine manufacturer Syngenta, revealing that the industry-funded studies significantly overestimate the benefits of atrazine without considering the value of nonchemical weed management techniques. Research, led by Frank Ackerman, PhD., professor at Tufts University in the Global Development and Environment Institute, questions the economic viability of atrazine in Syngenta’s study. Researchers critically review five papers released by ABT in 2011, which claim that the withdrawal of atrazine would diminish corn yields by 4.4%, increasing corn prices by 8%. Using these assumptions, Dr. Ackerman and his team calculated that corn growers’ revenue would actually increase by 3.2%, providing a total of $1.7 billion to farmers and the U.S. economy with minimal price changes for consumers. In short, because of price elasticity, eliminating atrazine would improve farmer revenues. According to the study, “The result [of an atrazine ban] would be an increase in corn growers’ revenues, […]

(Beyond Pesticides, January 16, 2014) Researchers in Norway recently released a new study giving organic consumers and anti-genetically engineered (GE) crop advocates another few solid reasons to promote organic and continue the fight against engineered crops.  Findings from the study demonstrate that not only do soybeans grown using organic cultivation practices provide the healthiest nutritional profile of the three classes of soybeans studied, but GE soybeans also retain glyphosate residues at higher levels than their conventional, non-GE soybean counterparts. In Compositional differences in soybeans on the market: Glyphosate accumulates in Roundup Ready GM soybeans (Soy Study), Thomas Bøhn of Genøk, Centre for Biosafety and his team of researcher examined 31 batches of soybeans””all grown in the United States.  The batches were separated into three categories: (1) GE, glyphosate-tolerant soy (GE-soy); (2) unmodified soy cultivated using conventional ”˜chemical’ practices; and (3) unmodified soy cultivated using organic practices. Among the three categories, all individual soybean samples were analyzed for their nutritional content, including total protein, total fat, dry matter, starch, ash, minerals, trace elements, vitamin B6, amino acid and fatty acid composition, in addition to the relevant pesticides used on the samples during cultivation. The study selected soybeans as the target crop […]

(Beyond Pesticides, January 15, 2013) The U.S. Supreme Court issued a decision on Monday  in the landmark federal lawsuit Organic Seed Growers and Trade Association et al v. Monsanto, limiting the ability of farmers to protect themselves from genetic drift. An earlier Appeals Court decision in the case acknowledged genetic drift as inevitable and evoked a public  commitment from Monsanto that it would not sue farmers faced with contamination of crops containing “trace amounts” of the company’s patented genes.  In the past, Monsanto has claimed that farmers were responsible and liable for its genetic property being found on land farmed by farmers who did not pay to cultivate the company’s genetically engineered crop. The Supreme Court refused to hear an appeal and reinstate the suit, denying farmers the right to argue their case in court and gain greater protection from potential abuse by the agrichemical and genetic engineering giant, Monsanto. Additionally, the high court decision dashes the hopes of family farmers who sought the opportunity to prove in court Monsanto’s genetically engineered seed patents are invalid. The case, originally filed on behalf of several plaintiffs on March 29, 2011, Organic Seed Growers & Trade Association, et al. v. Monsanto, challenges […]

(Beyond Pesticides, January 14, 2014) Agrichemical companies filed   a lawsuit to stop Kauai County  from moving ahead with its new law  to restrict genetically engineered (GE) agriculture and toxic pesticide applications near schools, hospitals, homes, and shorelines. As the first Hawaiian Island to pass restrictions on pesticides and GE agriculture, Kauai County saw an unprecedented outpouring of public support for Bill 2491. Despite numerous attempts by agrichemical companies to derail the bill, including personal attacks on councilmembers, and in the face of a veto by Mayor Bernard Carvalho, the residents of Kauai prevailed when the County Council chose to override the Mayor’s veto and make Bill 2491 law. Kauai’s  action for a  safe and healthy community was followed in Hawaii County by Bill 113, which restricts new GE crops. Efforts in Maui County are now underway to enact protections similar to Kauai’s. The lawsuit, filed January 11 in U.S. District Court, attempts to block Bill 2491 from coming into law (it is currently set to go into effect 9 months after its passage), and was brought forward by agrichemical company giants  DuPont, Syngenta, and Agrigenetics Inc., an affiliate of Dow Agrosciences. The suit does not come as a complete […]

(Beyond Pesticides, January 13, 2013) As medical and recreational production of marijuana in the U.S. increases, new and complicated questions have risen over how to limit consumers’ exposure to pesticides through marijuana consumption. Many growers are facing limited institutional knowledge and economic forces that could lead to the unnecessary use of pesticides. States are also still wrestling with the adequate  regulation of production and testing practices. Exposure to pesticides from marijuana consumption may also be more harmful than exposure through food consumption when consumed through inhalation. As marijuana consumption becomes more widely legalized, many are calling for  stronger safety standards for marijuana production. Alan Schreiber, Ph.D., President of the Agriculture Development Group, believes that the legalization of recreational marijuana use in Colorado and Washington will lead to immense demand for pest prevention research. Currently, growers of marijuana lack institutional assistance from federal agencies or state agricultural extension services, which have limited understanding of marijuana production. There is a concern that the lack of  field research and increased demand may lead to heavy pesticide use. In Washington, the state will allow the equivalent of 46 acres to be grown for recreational use, a factor that Dr.. Schreiber says will drive most […]