16
Jul
(Beyond Pesticides, July 16, 2025) A study following a mass mortality event of approximately 200 monarch butterflies (Danaus plexippus plexippus) in Pacific Grove, California, highlights the role of pesticides, synthetic pyrethroids in particular, in causing lethal and sublethal effects to nontarget organisms. The research, published in Environmental Toxicology and Chemistry, detects residues of 15 pesticides and associated metabolites in the bodies of 10 deceased butterflies collected from the January 2024 event that occurred near an overwintering site frequented by monarchs. “On average, each monarch butterfly contained 7 pesticides,” the authors report. They continue, “Notably, three pyrethroid insecticides—bifenthrin, cypermethrin, and permethrin—were consistently detected at or near each chemical’s lethal dose (LD50).” LC50, or Lethal Concentration 50, values represent the concentrations of chemicals lethal to 50% of a test population. To assess pesticide residues within ten of the deceased butterflies, the researchers use liquid and gas chromatography with tandem mass spectrometry (LC-MS/MS and GC-MS/MS) and find “a total of 15 pesticides and associated metabolites in the butterflies, including 8 insecticides (plus 1 associated metabolite), 2 herbicides (plus 2 associated metabolites), and 2 fungicides.” The study “present[s] evidence that the mortality incident at the Pacific Grove Monarch overwintering site was likely caused by […]
Posted in Beneficials, Bifenthrin, Biodiversity, California, cypermethrin, Death, Ecosystem Services, Metabolites, Permethrin, Pesticide Residues, Poisoning, Pollinators, pyrethroids, synergistic effects, Synthetic Pyrethroid, Synthetic Pyrethroids, Wildlife/Endangered Sp. | No Comments »
16
Jun
***Featured Art Page submissions for National Pollinator Week, highlighted with the gratitude of Beyond Pesticides: Jesse from Livermore, CA: “Honeybee Pollinating Citrus Blossom”; Yumi from New York, NY: “Birds and the Bees”; Gretchen from Helena, MT: “Butterflies”; Janet from Concord, MA: “Beneath the Big Dipper”; and Trix from Petersburg, NY: “Downy Woodpecker.” (Beyond Pesticides, June 16, 2025) Every year, Beyond Pesticides announces National Pollinator Week to remind eaters of food, gardeners, farmers, communities (including park districts to school districts), civic organizations, responsible corporations, policy makers, and legislators that there are actions that can be taken that are transformative. All the opportunities for action to protect pollinators, and the ecosystems that are critical to their survival, can collectively be transformational in eliminating toxic pesticides that are major contributors to the collapse of biodiversity. This is why Beyond Pesticides starts most discussions and strategic actions for meaningful pollinator and biodiversity protection with the transition to practicing and supporting organic. In launching National Pollinator Week, Beyond Pesticides makes suggestions for individual actions to increase efforts to think and act holistically to protect the environment that supports pollinators. The impact that people have starts with grocery store purchases and the management of gardens, parks, […]
Posted in Alternatives/Organics, Announcements, Bats, Biodiversity, Birds, Children, Children/Schools, Climate, Congress, Ecosystem Services, Environmental Justice, Events, Farmworkers, Habitat Protection, Holidays, Parks, Parks for a Sustainable Future, Pollinators, Reflection, Seasonal, Take Action, Uncategorized, Wildlife/Endangered Sp. | No Comments »
20
Dec
Image: Art Page submission from Carol Moyer, “Monarch Butterfly Sideways with Closed Wings.“ (Beyond Pesticides, December 20, 2024) On December 12, the U.S. Fish and Wildlife Service (FWS) opened a public comment period on its proposal to list the monarch butterfly (Danaus plexippus) as a threatened species and to designate critical habitats for the species under the Endangered Species Act of 1973. Under the proposal, the designated habitats would span approximately 4,395 acres throughout overwintering sites in coastal California. The public comment period will be open until March 12, 2025. These suggested protections call attention to the role of chemical-intensive agriculture in affecting populations of pollinators and other beneficial organisms. George Kimbrell, legal director at the Center for Food Safety, shares in a press release that the “monarch listing decision is a landmark victory 10 years in the making. It is also a damning precedent, revealing the driving role of pesticides and industrial agriculture in the ongoing extinction crisis… But the job isn’t done: Monarchs still face an onslaught of pesticides. The Service must do what science and the law require and promptly finalize protection for monarchs.” In the docket, FWS states, “Under the Act, a species warrants listing if […]
Posted in Beneficials, Biodiversity, Climate Change, Ecosystem Services, Endangered Species Act (ESA), Fish and Wildlife Service (FWS), Habitat Protection, Pollinators, Wildlife/Endangered Sp. | 1 Comment »
23
Apr
(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 […]
Posted in Agriculture, Alternatives/Organics, Chlorpyrifos, Cyfluthrin, Habitat Protection, Imidacloprid, Increased Vulnerability to Diseases from Chemical Exposure, neonicotinoids, organophosphate, Pesticide Drift, Pollinators, Pyrethrin, Reproductive Health, Synthetic Pyrethroid, Thiamethoxam, Uncategorized, Wildlife/Endangered Sp. | No Comments »
