09
Aug
Glyphosate Stresses Tadpoles to Produce More Venom
(Beyond Pesticides, August 9, 2017) Common toad tadpoles express more venom when chronically exposed to glyphosate herbicides, a study published last month in Proceedings of the Royal Society B indicates. Glyphosate, an
increasingly controversial chemical found in Roundup brand herbicides produced by Monsanto, has been linked to a range of adverse impacts in both wildlife and people. The results of this research indicate a need to reduce the use of glyphosate in our environment to ease chronic stressors to sensitive wildlife like amphibians.
Scientists tested the effects of formulated glyphosate products on toad tadpoles through experiments in a laboratory setting, as well as a mesocosm, a controlled outdoor environment that replicates natural conditions. Tadpoles in the lab were split into a series of groups which were each exposed to varying levels of glyphosate, some for the duration of the experiment, and others for 9 day periods during different stages in their development. For mesocosm tadpoles, researchers set up large plastic tubs and created small self-sustaining ecosystems with pond water and beech leaves. Glyphosate herbicides were added to certain tubs at either low or high concentrations. Both lab and mesocosm experiments had control tadpoles not exposed to any glyphosate herbicides.
Tadpoles exposed to the highest levels of glyphosate products throughout the duration of the lab experiment were found to have considerably more venom concentration in their bodies than control tadpoles. However, lab results found little correlation between higher venom levels and 9 day periods of glyphosate exposure at different developmental stages. For the mesocosm experiments, tadpoles exposed at high and low glyphosate concentrations had significantly higher venom concentrations than control tadpoles.
Common toads will excrete venom, or bufotoxins containing the chemical bufadienolide, which adversely affects another animal’s heart, in order to ward off predators. Scientists indicate that while higher levels of venom may seem good for the toad, they may cause unintended effects throughout the ecosystem. Increases in toxin concentrations detected after glyphosate exposure were comparable to those seen in other species under predatory threat, which resulted in death to the predator, researchers note. “Although pesticides make toads more toxic, the predator-prey balance and the composition of natural habitats in freshwater, as much as on land, may be altered,†said Veronika Bókony, PhD, an author of the study.
This is not the first instance of glyphosate altering the normal development of amphibians. Earlier this year, the same team of researchers found that glyphosate products reduced the survival and growth of common toads, and otherwise slowed down their development. A 2012 study from the University of Pittsburg found that glyphosate induced morphological changes in the development of leopard and wood frogs similar to those seen under significant predatory threat.
The results of accumulated scientific research on stress-induced changes following glyphosate exposure points to underlying flaws in U.S. regulation of pesticides. Ecosystem-wide impacts caused by the secondary effects of pesticide use are rarely, if ever, considered under the risk assessment framework used to register pesticides.
For alternatives to the use of glyphosate, start with practices that encourage healthy soil, such as mowing high, proper, aeration and proper watering to reduce weed pressure. When cultural practices have been attempted and mechanical means are ineffective or impractical, use Beyond Pesticides’ List of Organic Compatible Products as a guide. And for more information on the impact of pesticides on amphibians, see Beyond Pesticides’ wildlife program page.
All unattributed positions and opinions in this piece are those of Beyond Pesticides.
Source: The Brussels Times, Proceedings of the Royal Society B









chemical used in genetically engineered (GE) fields. Dicamba, a toxic pesticide prone to drift off the target site, has been used in agriculture for decades. However, new GE crops developed by Monsanto must be paired with specific formulations of dicamba, and until now many believed these drift incidents were the result of illegal formulations of dicamba being applied to fields. But the extent of damage now being observed, covering over 2.5 million acres, is casting doubt on this theory, and raising more questions as to whether the new dicamba formulation is actually the cause of the widespread drift damage.
during the cabbage planting cycle
Grassroots advocates who supported passage of the Healthy Lawns Act to protect children, families and the environment are dismayed by the court’s ruling, but nevertheless vow to keep up the fight for protections from hazardous pesticides used in their community. “The court should have recognized that, in restricting lawn pesticides throughout its jurisdiction, Montgomery County is exercising a local democratic principle under Maryland and federal law to ensure the safety of the community, including children, pets, and the environment, from a known hazard not adequately regulated by the U.S. Environmental Protection Agency or the state,†said Jay Feldman, executive director of Beyond Pesticides. “After extensive hearings and study, the county council understands that toxic chemicals are dangerous and not needed to have beautiful lawns and landscapes,†Mr. Feldman said.
(Beyond Pesticides, August 3, 2017) Working in close contact with pesticides over the course of one’s lifetime increases the risk of Chronic Obstructive Pulmonary Disease (COPD) and other breathing disorders, according to a
Masarinae are the only “vegetarian†wasp in the family Vespidae., They feed solely on nectar and pollen, unlike their more aggressive Vespid wasp cousins. There are 300 species of pollen wasp from 14 genera spread across the globe, however, in the U.S., all 14 species of pollen wasps originate from the genus Pseudomasaris.
industry and the federal government to conceal from the public the real dangers associated with the use and manufacture of chemical products. The Bioscience Resource Project and the Center for Media and Democracy released more than 200,000 pages of these documents now accessible on the “
growers, those same growers are threatened by the flooding of the market with cheaper fraudulent grains. The resulting impacts of eliminating market opportunities while at the same time threatening the value of the organic label hurt organic farmers in this country.
disrupting, industrial chemicals have been found in 10 varieties of macaroni and cheese products. The coalition is calling on food companies, especially the Kraft Heinz Company, maker of the iconic boxed mac and cheese, to eliminate sources of these chemicals from their cheese products.
Farmers and Farmworkers from Nerve Agent Pesticides Act,
concerning labeling of genetically engineered (GE) food. Campbell’s President and CEO Denise Morrison said that while the company does not question the safety of GE food, it recognizes that most consumers want to see GE ingredients on the label. Meanwhile, Campbell’s has supported the GMA digital disclosure and lists ingredients that “may be derived from crops grown from genetically engineered seeds†on its
term, intensive glyphosate use, and myriad resulting concerns about impacts on soil and environmental health. The review, by Robert J. Kremer, PhD, of the University of Missouri School of Natural Resources, cites
South Florida scientist Jason Rohr, PhD and colleagues
genetically engineered (GE) ingredients [or genetically modified organisms (GMO)] are identified on products labels, or hidden behind high tech codes. 
herbicides
have been
7, 2017. Now, state officials have to develop guidelines for product labels and determine what level of exposure to the pesticide will put people at risk for developing cancer. Some have argued that the state’s proposed levels are not protective enough. Meanwhile, the state continues to face pressure from Monsanto, maker of glyphosate, which continues to challenge the decision to list the chemical as a known cancer-causing agent.
