(Beyond Pesticides, June 12, 2020) New research finds that western monarch milkweed habitat contains a “ubiquity of pesticides” that are likely contributing to the decline of the iconic species. The research, published in Frontiers in Ecology and Evolution, provides a grim snapshot of a world awash in pesticides, and raises new questions about the U.S. regulatory process that continues to allow these toxic chemicals on to the market without adequate review and oversight. “We expected to find some pesticides in these plants, but we were rather surprised by the depth and extent of the contamination,” said Matt Forister, PhD, a butterfly expert, biology professor at the University of Nevada, Reno and co-author of the paper in a press release. “From roadsides, from yards, from wildlife refuges, even from plants bought at stores—doesn’t matter from where—it’s all loaded with chemicals. We have previously suggested that pesticides are involved in the decline of low elevation butterflies in California, but the ubiquity and diversity of pesticides we found in these milkweeds was a surprise,” Dr. Forister said. The researchers collected over 200 milkweed samples from nearly 20 different sites across the Central Valley of California, as well as from retailers that sell milkweed […]

(Beyond Pesticides, June 9, 2020) Use of the weed killer dicamba on genetically engineered (GE) cotton and soybeans is now prohibited after a federal court ruling against the U.S. Environmental Protection Agency (EPA) last week. A coalition of conservation groups filed suit in 2018 after EPA renewed a conditional registration for dicamba’s ‘over the top’ (OTT) use on GE cotton and soy developed to tolerate repeated sprayings of the herbicide. “For the thousands of farmers whose fields were damaged or destroyed by dicamba drift despite our warnings, the National Family Farm Coalition is pleased with today’s ruling,” said National Family Farm Coalition president Jim Goodman in a press release. First registered in the late 1960s, dicamba has been linked to cancer, reproductive effects, neurotoxicity, birth defects, and kidney and liver damage. It is also toxic to birds, fish and other aquatic organisms, and known to leach into waterways after an application. It is a notoriously drift-prone herbicide. Studies and court filings show dicamba able to drift well over a mile off-site after an application. Bayer’s Monsanto thought they could solve this problem. The “Roundup Ready” GE agricultural model the company developed, with crops engineered to tolerate recurrent applications of their […]

(Beyond Pesticides, May 28, 2020) Exposure to agricultural and industrial pesticides, solvents (thinners), electromagnetic fields, and heavy metals predispose humans to amyotrophic lateral sclerosis (ALS), according to an Italian research study, “Environmental and Occupational Risk Factors of Amyotrophic Lateral Sclerosis: A Population-Based Case-Control Study,” published in the International Journal of Environmental Research and Public Health. Although research supports ALS’s genetic etiology, epidemiologic research associating ALS risks and to environmental, or work-related risk factors (i.e., pesticide use, pollutant exposure, heavy metal exposure, etc.) has been inconsistent and non-definitive. This research demonstrates the importance of assessing aggregate health risks associated with occupational pesticide exposure, especially when determining potential exposure routes in specific occupational sectors. In the study, researchers note, “In particular, having an occupation in the agricultural sector, especially with a long duration of the working activity as well as occupational exposure to some chemicals…might increase ALS risk.” While scientists extensively study the epidemiology of amyotrophic lateral sclerosis (ALS)—a rare, yet fatal neurodegenerative disease—occupational and environmental hazards inducing random (sporadic) or hereditary ALS diagnoses remain vague. With researchers predicting a global ALS incidence increase of 69% by 2040, identifying ALS’s causal factors are important to future research. In this research, Italian researchers conducted a case-control, […]

(Beyond Pesticides, May 21, 2020) Use of the herbicide dicamba increases humans’ risk of various acute and chronic cancers, according to research published in the International Journal of Epidemiology by the National Institutes of Health (NIH). Many pesticides are “known or probable” carcinogens (cancer-causing agents), and their widespread use only amplifies chemical hazards, adversely affecting human health. However, past research lacks comprehensive information regarding human health effects associated with long-term pesticide use. This study highlights the significant role that long-term research plays in identifying potential health concerns surrounding registered pesticides, especially as the Environmental Protection Agency (EPA) plans to reaffirm its decision to allow dicamba use on genetically engineered (GE) crops. Nathan Donley, Ph.D., a scientist with the environmental health program at the Center for Biological Diversity, comments: “This sweeping study exposes the terrible human cost of the EPA’s reckless decision to expand the use of dicamba. […]For the EPA to approve widespread use of this poison across much of the country without assuring its safety to people and the environment is an absolute indictment of the agency’s persistent practice of rubber-stamping dangerous pesticides.” Dicamba—a benzoic acid chemical that controls broadleaf weeds—is one of the most widely applied herbicides in corn production. As a result of weed resistant to […]

(Beyond Pesticides, May 12, 2020) California Governor Gavin Newsom (D) is issuing new enforcement guidelines intended to protect children and residents from toxic pesticides during the Covid-19 pandemic. With schoolchildren spending their time at home while in quarantine, many, particularly those in agricultural communities, are at increased risk of pesticide exposure. “During this public health crisis, it is important to ensure the strict enforcement and oversight of regulations that protect children from pesticide exposure,” Governor Newsom wrote in a letter to the state Environmental Protection Agency (CalEPA). While much of the guidance simply reinforces current legal requirements, it places an emphasis on strict enforcement. County Agricultural Commissioners (CACs), the state’s primary enforcement officers for pesticide laws, must “strictly enforce all applicable health protections around homes and schools” during the pandemic, seven days a week. Further, it stresses that pesticide applications “are expressly prohibited,” when there is, “reasonable possibility of contamination of the bodies or clothing of persons not involved in the application.” The state will prioritize the investigation of any violations made in residential areas. The state will also “take a strict approach to assessing penalties.” Violations of pesticide law that occur near homes or schools during coronavirus quarantine will […]

(Beyond Pesticides, May 8, 2020) At the height of Covid-19 impacts in the Northeast U.S., Massachusetts Governor Charlie Baker (R) and Lieutenant Governor Karyn Polito (R) filed emergency legislation at the Boston State House that would, according to their April 16 press release, “help the Commonwealth more effectively combat diseases transmitted by mosquitoes, including arboviruses like Eastern Equine Encephalitis (EEE) and West Nile Virus (WNV), by authorizing a coordinated, proactive, statewide approach to mosquito control activities.” Protecting the public from such diseases is an important public health mission. However, the Governor’s bill, H.4650, represents an alarming “over-reach” that would give unitary authority to the State Reclamation and Mosquito Control Board (SRMCB) to conduct mosquito control activities, including ineffective and toxic spraying, with virtually no effective oversight or transparency. Beyond Pesticides opposes this bill, whose passage would enable use of pesticides that can have respiratory and immune impacts — increasing health risks for everyone, but especially for the many people already at higher risk from Covid-19, despite the availability of ecological management approaches that eliminate the need for toxic chemicals. H.4650, An Act to mitigate arbovirus in the Commonwealth — was promulgated in response to a Massachusetts Department of Public Health […]

(Beyond Pesticides, April 23, 2020) Pesticide spray drift from adjacent farmlands expose butterfly larvae to lethal pesticide concentrations, according to research published in Environmental Toxicology and Chemistry by Iowa State University (ISU). Lack of previous experimental pesticide toxicity data makes it unclear as to what degree insecticides impact monarch butterfly (Danaus plexippus) productivity in milkweed (Asclepias spp.) habitats near pesticide-treated pasture. This study adds weight to the idea that pesticides are playing a role in the ongoing decline of this iconic butterfly, as researchers find insecticide drift from adjacent fields to be strongly associated with larval mortality. Future monarch butterfly conservation efforts should consider risks stemming from pesticide exposure when developing butterfly rehabilitation efforts, according to advocates. As co-author Niranjana Krishnan (ISU graduate student) states, “In order to make the best decisions about how and where to plant milkweed, we first need to find basic toxicity and exposure data.”  ISU researchers established monarch butterfly colonies by collecting larvae from roadside milkweeds, which they then reared in the laboratory for incubation. To analyze the relative toxicity of various insecticides on monarch butterflies, researchers applied normal field-application rates of each pesticide at different larval development stages. Scientists used a bioassay to measure the […]

(Beyond Pesticides, April 7, 2020) Last week, the U.S. Environmental Protection Agency (EPA) registered a carcinogenic herbicide for new uses without following  the required public notification and comment process, the Midwest Center for Investigative Reporting (MCIR) reports. The chemical in question, isoxaflutole, is a broadleaf weedkiller that can now be applied to genetically engineered (GE) soybeans in half of U.S. states. Health and environmental groups are outraged by EPA’s furtive move, accusing the agency of colluding with the pesticide industry. “Clearly no one from the public health community knew about this because no one commented,” said Nathan Donley, PhD, of the Center for Biological Diversity to MCIR. “Yet there was all these industry comments, all these positive comments. Someone was tipped off that this docket had been opened. One side was able to comment, the other wasn’t.” Without public notification, only 54 comments were received. In its decision document, the agency touted how most of the input “were generally in favor of the decision to register the new use.” When questioned about its move, EPA simply told MCIR that it “requested public comment on the proposed registration decision.” The Federal Register provides the public notice of a proposed rulemaking by […]

(Beyond Pesticides, February 28, 2020) State legislators in Boise, Idaho have advanced House Bill 487, An Act Relating to Pesticides and Chemigation, out of the House Agricultural Affairs Committee. If passed, the statutory alterations in this bill would, according to the Idaho Statesman, loosen some rules on aerial application by crop-dusting airplanes, and reduce state agricultural investigators’ ability to regulate the spraying of pesticides. The legislation replaces sections of current rules and deletes language regarding drift, including “Chemicals shall not be applied when wind speed favors drift beyond the area intended for treatment or when chemical distribution is adversely affected.” Such changes will exacerbate the already-significant issue of pesticide drift. In an overview of the pesticide dicamba, Beyond Pesticides recently reported on this legislative development, as well as on a precipitating exposure event in an Idaho hops field. Banning of aerial spraying, as has been attempted by some localities, would go a long way toward eliminating the harms of pesticide drift. The only conclusion that can be drawn from this is the following: As the problem of drift grows and farmers’ crops and people are put at risk, this legislation attempts to define away serious problems and eliminate protections. The Idaho […]

(Beyond Pesticides, February 20, 2020) Missouri’s largest peach farm, Bader Farms, is set to receive $265 million in compensation from two multinational agrichemical companies after the companies’ dicamba-based weed killers caused widespread damage to the farm’s fruit trees. Bayer’s Monsanto and BASF were found to be responsible for negligence in the design of their dicamba herbicides, and failure to warn farmers about the dangers of their products. The jury determined that the joint venture between the two companies amounted to a conspiracy to create an “ecological disaster” in the name of profit. In 2015, the U.S. Department of Agriculture (USDA) approved Bayer Monsanto’s release of a new line of genetically engineered (GE) seeds designed to tolerate repeated spraying of dicamba. With glyphosate resistant ‘super-weeds’ widespread and threatening GE farmer’s yields, the company aimed to redeploy dicamba, one of the oldest herbicides in the market, on cotton and soybeans throughout the U.S. Knowing the propensity of dicamba to drift for miles off site, Bayer’s Monsanto promised a new product line with much lower volatility.  But as the company was waiting on approval for this product by the Environmental Protection Agency (EPA), it nonetheless began selling its dicamba-tolerant seeds. This led to […]

(Beyond Pesticides, February 19, 2020) The ongoing insect apocalypse isn’t sparing the iconic firefly. In an article published this month, “A Global Perspective on Firefly Extinction Threats,” experts are sounding the alarm over declines in fireflies attributed to habitat loss, light pollution, and indiscriminate pesticide use. “Our goal is to make this knowledge available for land managers, policy makers and firefly fans everywhere,” said study co-author Sonny Wong, PhD, of the Malaysian Nature Society to USA Today. “We want to keep fireflies lighting up our nights for a long, long time.” Although there is scant monitoring data on firefly populations, studies that have been conducted over the last decade, alongside anecdotal reports and expert opinion, have led to international concern. To assess conservation status and threats to firefly species, the International Union for the Conservation of Nature (IUCN) established a Firefly Specialist Group. The study, part of the specialist group’s investigation, surveyed firefly experts from around the world on what they viewed as the primary threats to firefly populations. Experts specified habitat loss, light pollution, and pesticide use as the three top concerns, though water pollution, tourism, invasive species, and climate change were also discussed as minor contributing factors. Night-time […]

(Beyond Pesticides, February 14, 2020) The weed killer dicamba has been blamed for killing or damaging millions of acres of non–genetically modified crops and other plants that have no protection against the compound. Litigation, legislation, and manufacturer machination abound as dicamba damage mounts. The trial in a suit filed in 2016 by a Missouri peach farmer against dicamba manufacturers Bayer and BASF has just begun; an Indiana state laboratory struggles to keep up with demand to evaluate dicamba damage; Idaho lawmakers are poised to weaken rules that protect farmworkers who apply dicamba (and other pesticides) aerially; agricultural officials in Missouri are pressuring the state legislature to increase funding to handle the exploding numbers of dicamba complaints; and Indiana’s legislature is considering two bills aimed at curtailing dicamba drift that kills neighboring crops. This Daily News Blog will round up the plethora of recent news on dicamba — the toxic and destructive culprit behind each of these stories. In the face of the U.S. Environmental Protection Agency’s (EPA) failure to mitigate dicamba hazards, states have been scrambling to enact limits on when and how dicamba can be used, amend buffer zones around application sites, and in some cases, ban its use outright. […]

(Beyond Pesticides, February 6, 2020) Bill Bader, a Missouri peach farmer, is taking on agrichemical giants for damages to his crops, allegedly caused by the volatile herbicide dicamba drifting from neighboring properties. Mr. Bader says that not only did he lose over 30,000 trees, his remaining peaches are now smaller and his trees are less productive. According to Bader, the damage has cost him $20.9 million for which he seeks restitution. The case is claiming that Monsanto, now owned by Bayer, and German partner company BASF knew that the sale of their products would result in crop damage due to drift, but sold dicamba-resistant cotton and soybean seeds anyway. The companies deny the claims. Dicamba is a benzoic acid herbicide that exerts an auxin-like growth regulatory effect when absorbed by plant tissue, ultimately causing the plant to outgrow its nutrient supply and die. Originally developed in the 1950’s, dicamba has become more popular as crops become resistant to glyphosate. It is extremely volatile and prone to drift. Soybeans are particularly sensitive to dicamba, and drift damage can pit neighbor against neighbor in rural communities. Risk of crop damage alone can drive farmers to buy dicamba-resistant soybean seeds. In addition to […]

(Beyond Pesticides, February 4, 2020) It was a good day for Bayer/Monsanto. The chemical company’s weed killer glyphosate and its neonicotinoid insecticides are set for reapproval by the U.S. Environmental Protection Agency (EPA), according to interim decisions published last week. EPA reapproval of human carcinogens and chemicals contributing to the pollinator crisis is disappointing for health and environmental advocates, but not surprising to those watchdogging the agency during the current administration. “This is how a captured agency behaves,” said Beyond Pesticides community resource and policy director Drew Toher. “When EPA’s decision making repeatedly reflects the exact wishes of the chemical industry, public trust erodes, and we must look to new policy mechanisms that support the protection of health and the environment.”   On Glyphosate EPA’s glyphosate decision document glosses over the hazards of the chemical and is requiring very few new safety measures when using the herbicide. These measures are focused on agriculture, including minor label changes around drift, guidelines on resistance management, and a label advisory indicating the chemical is toxic to plants and may adversely impact pollinator foraging. The restrictions fail to match those proposed by Health Canada in 2015, which included buffer zones and restricted entry intervals. […]

(Beyond Pesticides, January 13, 2020) Birds are facing an existential crisis. Three billion birds have disappeared since 1970. Two out of three birds are threatened by climate change. In spite of this crisis, our nation’s most important bird protection law, the Migratory Bird Treaty Act (MBTA) is being weakened by the Trump Administration’s Department of the Interior. Ask your U.S. Representative to support and cosponsor the Migratory Bird Protection Act. Thank those who are already cosponsors. Songbirds Threatened. The poisonous farm fields that migratory birds forage reduce their weight, delay their travel, and ultimately jeopardize their survival, according to “A neonicotinoid insecticide reduces fueling and delays migration in songbirds,“ published in the journal Science. Like their effects on insect pollinator populations, neonicotinoid insecticides generally do not cause acute poisoning and immediate death, but instead precipitate a cascade of sublethal impacts reducing their fitness in the wild. As the authors told Environmental Health News, the study is a call not simply to ban neonics or one class of chemical, but to change the entire farming system toward more sustainable bird and bee-friendly practices. Bird Habitat Threatened in Arkansas. A citizen science monitoring project of Audubon Arkansas found evidence of contamination from the weed killer dicamba far […]

(Beyond Pesticides, November 18, 2019) The U.S. Environmental Protection Agency is proposing changes to the way farmworkers and bystanders are protected from toxic pesticide applications. Billed as “improvements” that will “reduce regulatory burdens for farmers,” the actions would instead significantly shrink Application Exclusion Zones (AEZs), buffer areas where individuals are not supposed to enter during a pesticide application, putting farmworkers and bystanders at risk. Tell your Congressional Representative and Senators that EPA must protect farmworkers. “Although the proposal is framed as a narrow revision, it would in fact eliminate, reduce, or weaken various AEZ provisions,” said Farmworker Justice attorney Iris Figueroa to Politico. “These changes threaten to increase exposure to toxic pesticide drift for farmworkers and their families.” EPA’s proposal, announced in a press release featuring the heads of industry associations like the American Farm Bureau, would do the following: Make AEZs applicable only to a farm owners’ property. Under the current rules, pesticide handlers are required to keep individuals out of an area where pesticides are applied both on and off site. Exempt on-farm family members from all aspects of the AEZ. EPA says this will allow farmers and their family “to decide whether to stay in their homes or…on […]

(Beyond Pesticides, October 29, 2019) The U.S. Environmental Protection Agency is proposing changes to the way farmworkers and bystanders are protected from toxic pesticide applications, per an announcement published on the agency’s website last week. Billed as “improvements” that will “reduce regulatory burdens for farmers,” the actions would instead significantly shrink Application Exclusion Zones (AEZs), buffer areas where individuals are not supposed to enter during a pesticide application. Health and justice advocates say the move will put farmworkers at risk. “Although the proposal is framed as a narrow revision, it would in fact eliminate, reduce or weaken various AEZ provisions,” said Farmworker Justice attorney Iris Figueroa to Politico. “These changes threaten to increase exposure to toxic pesticide drift for farmworkers and their families.” EPA’s proposal, announced in a press release featuring the heads of industry associations like the American Farm Bureau, would do the following: Make AEZs applicable only to a farm owners’ property. Under the current rules, pesticide handlers were required to keep individuals out of an area where pesticides were applied both on and off site. Exempt on-farm family members from all aspects of the AEZ. EPA says this will allow farmers and their family “to decide whether […]

(Beyond Pesticides, October 4, 2019) A Circuit Court judge in Lincoln County, Oregon has overturned a hard-won ban on aerial spraying of pesticides, citing preemption of state law over any local ordinance. In her late-September decision, Judge Sheryl Bachart wrote that Oregon’s Pesticide Control Act “expressly and conclusively displaces any local ordinance regarding pesticide use. The intention of the legislature is apparent and unambiguous.” She noted in her opinion that the Oregon Revised Statutes (the codified laws of the state of Oregon), Chapter 634.057 “prohibits local governments from making any ordinance, rule or regulation governing pesticide sale or use.” Voters in the county approved the subject ban on the aerial spraying of pesticides (Measure 21-177) in 2017, the initiative having been spurred by the work of Lincoln County Community Rights (LCCR), a grassroots organization that “seeks to educate and empower people to exercise their right of local community self-government in matters that pertain to their fundamental rights, their natural environment, their quality of life, their health and their safety.” In its advocacy for the initiative, the group cited both the harm done by aerial pesticide spraying to people and ecosystems, and the injustice of laws — often drafted by corporations for approval […]

(Beyond Pesticides, September 18, 2019) A new report published by Friends of the Earth (FOE), “Pesticides and Soil Health” highlights healthy soil as a key pillar of regenerative, organic agriculture. There are numerous methods that regenerative agriculture utilizes to maximize soil health such as cover cropping, crop rotation, and compost applications. FOE focuses in on an often-overlooked aspect to soil health, “that eliminating or greatly reducing toxic pesticides is key to building healthy soils and ecosystems for a healthy planet.” Beyond Pesticides has long believed that toxic pesticide use has no place in organic and regenerative land management practices and that they can and should be eliminated. According to Jay Feldman, executive director of Beyond Pesticides and former member of the National Organic Standards Board (NOSB) said, “Pesticide reduction strategies that allow continued use of toxic substances undermine the soil biology and biodiversity that is critical to healthy plants and  unnecessary to achieving pest management goals.” “It’s past time to talk elimination of toxic pesticides and nothing short of that.” Toxic pesticides have a diverse range of unintended impacts, including  cancer and other diseases to those exposed via usage or drift, and crop loss. Lesser known is the impact that pesticides […]

(Beyond Pesticides, September 13, 2019) A study on the use of the herbicide dicamba’s off-target effects finds broad impacts, in both geographic spread and the variety of affected species, with use of the weed killer on Arkansas cropland putting birds at risk in agricultural landscapes. Audubon of Arkansas is reporting results of its community science dicamba monitoring project, conducted under the direction of Bird Conservation Director Dan Scheiman, PhD, and launched in late spring 2019. The project monitored dicamba symptomology in species on municipal, state, and federal lands, where dicamba was not applied, but where its impacts were nonetheless detected. Arkansas Audubon “predicts that in a landscape full of GMO crops [genetically modified organisms] (on which dicamba is typically used), the atmospheric loading of volatile dicamba could be enough to cause landscape scale damage to our state natural areas, wildlife management areas, national wildlife refuges, family farms, and the wildlife they harbor.” Dicamba herbicides are volatile compounds used to control broadleaf weeds — especially on fields of GMO soybean and cotton crops that have been genetically engineered for resistance to dicamba. These herbicides damage non-GMO crops and native plants well beyond intended application areas. (In 2017, more than 3 million acres of […]

(Beyond Pesticides, August 30, 2019) The indictment of organophosphate pesticides gained more traction with the publication, in the Proceedings of the National Academy of Sciences, of a new research study out of the University of California, Berkeley. The research, among the first to use advanced brain imaging to assess cortical activation, shows altered brain activity, during tasks that call on executive function, in teenagers from California’s Salinas Valley (the site of significant organophosphate use) whose mothers were exposed prenatally. The UC Berkeley study underscores the slow-motion calamity of the Trump administration Environmental Protection Agency’s (EPA’s) failure to ban the use of this class of pesticides, and of chlorpyrifos in particular, which compounds carry extreme risks for children. The effects of this prenatal exposure continue to unfold during children’s critical developmental periods. Researchers used fNIRS (functional near-infrared spectroscopy) imaging to monitor blood flow in the brains of the teens, 15–17, born and raised in the Salinas Valley. They used data from the California Pesticide Use Reporting program (which documents locations and times of pesticide spraying) to estimate the subjects’ mothers’ proximity to organophosphate (OP) applications during pregnancy. The subject adolescents — estimated to have relatively high levels of prenatal exposure to organophosphates — […]

(Beyond Pesticides, August 29, 2019) The Peoples Garden, located on the grounds on the U.S. Department of Agriculture (USDA) on the national mall, has been renamed and remodeled to highlight genetically engineered (GE) crops and farming techniques that directly counter the organic movement. The new exhibit, entitled “Voice of the Farmer,” is part of the “Trust in Food” initiative of Farm Journal magazine. This marks a continuation of trends in the Trump administration: pushing for GE/GMOs and pesticides. Since 2009, the USDA Peoples Garden has highlighted organic agriculture. It was originally envisioned by the Obama administration as a place where visitors could learn about what differentiates organic from conventional chemical-intensive food production, and the practices used in organic land management. The garden had several different exhibits: the Three Sisters Garden, the People’s Garden Apiary, three green roofs, a certified organic vegetable garden, a tool shed with a rain barrel and green roof, wildlife and pollinator friendly landscaping, and a bat house. With an emphasis on sustainable gardening practices such as cover cropping, storm water collection, and composting, the garden served as a headquarters for numerous Peoples Gardens founded between 2009 and 2016. The People’s Garden and other projects of the […]

(Beyond Pesticides, August 15, 2019) An article in the journal Plos One, “An assessment of acute insecticide toxicity loading (AITL) of chemical pesticides used on agricultural land in the United States,” shows that recent shifts in insecticide use—from organophosphates and carbamates to synthetic pyrethroids and neonicotinoids—have made a large contribution to the ongoing insect apocalypse. This shift to insecticides that target insects based on both selective toxicity and delivery method occurs within a context of shrinking habitat and biodiversity. The study, by Michael DiBartolomeis, PhD, Susan Kegley, PhD, Pierre Mineau, PhD, Rosemarie Radford, and Kendra Klein, PhD, presents a measure of acute insecticide toxicity loading that incorporates acute toxicity, quantity used, and the rate at which the insecticide degrades. Goulson et al. applied a similar measure in Great Britain that did not incorporate the rate of degradation. Both studies use the median lethal dose (LD50) to honey bees as a measure of acute toxicity and calculate the potential number of bee deaths based on the number of lethal doses of various insecticides applied in the field. In both cases, researchers used toxicity estimates for honey bees because they are widely available. Other insects may be more or less sensitive. The […]