|Introduced to market||1976|
|Agriculture||non-selective post-emergence weed control|
|Surfactant||Polyethoxylated tallow amine (most common)|
|Main active ingredient||isopropylamine salt of Glyphosate|
|Mode of action||5-enolpyruvylshikimate-3-phosphate synthase(EPSPS) inhibitor|
Roundup is the brand name of a systemic, broad-spectrum glyphosate-based herbicide originally produced by the U.S. company Monsanto, which was acquired by Bayer in 2018, and contains the active ingredient glyphosate. Glyphosate is the most widely used herbicide in the USA. As of 2009, sales of Roundup herbicides still represented about 10% of Monsanto's revenue despite competition from Chinese producers of other glyphosate-based herbicides; the overall Roundup line of products (which includes GM seeds) represented about half of Monsanto's yearly revenue.
Monsanto developed and patented the glyphosate molecule in the 1970s, and marketed Roundup from 1973. It retained exclusive rights to glyphosate in the US until its US patent expired in September, 2000; in other countries the patent expired earlier. The Roundup trademark is registered with the US Patent Office and still extant. However, glyphosate is no longer under patent, so similar products use it as an active ingredient.
Monsanto also produced seeds which grow into plants genetically engineered to be tolerant to glyphosate, which are known as Roundup Ready crops. The genes contained in these seeds are patented. Such crops allow farmers to use glyphosate as a post-emergence herbicide against most broadleaf and cereal weeds.
Beyond the glyphosate salts content, commercial formulations of Roundup contain surfactants, which vary in nature and concentration. As a result, the effects of this herbicide are not with the main active ingredient alone, but with complex and variable mixtures.
Roundup contains the surfactant polyethoxylated tallow amine (POEA), which makes it more toxic for aquatic species than some other glyphosate formulations. Independent scientific reviews and regulatory agencies have regularly concluded that glyphosate-based herbicides do not lead to a significant risk for human or environmental health when the product label is properly followed.
The acute oral toxicity for mammals is low, but death has been reported after deliberate overdose of concentrated Roundup. The surfactants in glyphosate formulations can increase the relative acute toxicity of the formulation. Surfactants generally do not, however, cause synergistic effects (as opposed to additive effects) that increase the acute toxicity of glyphosate within a formulation. The surfactant POEA is not considered an acute toxicity hazard, and has an oral toxicity similar to vitamin A and less toxic than asprin. Deliberate ingestion of Roundup ranging from 85 to 200 ml (of 41% solution) has resulted in death within hours of ingestion, although it has also been ingested in quantities as large as 500 ml with only mild or moderate symptoms. Consumption of over 85 ml of concentrated product is likely to cause serious symptoms in adults, including burns due to corrosive effects as well as kidney and liver damage. More severe cases lead to "respiratory distress, impaired consciousness, pulmonary edema, infiltration on chest X-ray, shock, arrhythmias, renal failure requiring haemodialysis, metabolic acidosis, and hyperkalaemia" and death is often preceded by bradycardia and ventricular arrhythmias.
Skin exposure can cause irritation, and photocontact dermatitis has been occasionally reported. Severe skin burns are very rare. In a 2017 risk assessment, the European Chemicals Agency (ECHA) wrote: "There is very limited information on skin irritation in humans. Where skin irritation has been reported, it is unclear whether it is related to glyphosate or co-formulants in glyphosate-containing herbicide formulations." The ECHA concluded that available human data was insufficient to support classification for skin corrosion or irritation.
Inhalation is a minor route of exposure, but spray mist may cause oral or nasal discomfort, an unpleasant taste in the mouth, or tingling and irritation in the throat. Eye exposure may lead to mild conjunctivitis. Superficial corneal injury is possible if irrigation is delayed or inadequate.
Glyphosate formulations with POEA, such as Roundup, are not approved for aquatic use due to aquatic organism toxicity. Due to the presence of POEA, glyphosate formulations only allowed for terrestrial use are more toxic for amphibians and fish than glyphosate alone. Terrestrial glyphosate formulations that include the surfactants POEA and MON 0818 (75% POEA) may have negative impacts on various aquatic organisms like protozoa, mussels, crustaceans, frogs and fish. Aquatic organism exposure risk to terrestrial formulations with POEA is limited to drift or temporary water pockets. While laboratory studies can show effects of glyphosate formulations on aquatic organisms, similar observations rarely occur in the field when instructions on the herbicide label are followed.
Studies in a variety of amphibians have shown the toxicity of products containing POEA to amphibian larvae. These effects include interference with gill morphology and mortality from either the loss of osmotic stability or asphyxiation. At sub-lethal concentrations, exposure to POEA or glyphosate/POEA formulations have been associated with delayed development, accelerated development, reduced size at metamorphosis, developmental malformations of the tail, mouth, eye and head, histological indications of intersex and symptoms of oxidative stress. Glyphosate-based formulations can cause oxidative stress in bullfrog tadpoles. The use of glyphosate-based pesticides are not considered the major cause of amphibian decline, the bulk of which occurred prior to widespread use of glyphosate or in pristine tropical areas with minimal glyphosate exposure.
A 2000 review of the toxicological data on Roundup concluded that "for terrestrial uses of Roundup minimal acute and chronic risk was predicted for potentially exposed nontarget organisms". It also concluded that there were some risks to aquatic organisms exposed to Roundup in shallow water.
There is limited evidence that human cancer risk might increase as a result of occupational exposure to large amounts of glyphosate, such as agricultural work, but no good evidence of such a risk from home use, such as in domestic gardening. The consensus among national pesticide regulatory agencies and scientific organizations is that labeled uses of glyphosate have demonstrated no evidence of human carcinogenicity. Organizations such as the World Health Organization (WHO) and the Food and Agriculture Organization, European Commission, Canadian Pest Management Regulatory Agency, and the German Federal Institute for Risk Assessment have concluded that there is no evidence that glyphosate poses a carcinogenic or genotoxic risk to humans. The final assessment of the Australian Pesticides and Veterinary Medicines Authority in 2017 was that "glyphosate does not pose a carcinogenic risk to humans". The EPA has classified glyphosate as Group E, meaning "evidence of non-carcinogenicity in humans". Only one international scientific organization, the International Agency for Research on Cancer (IARC), affiliated with the WHO, has made claims of carcinogenicity in research reviews. The IARC has been criticized for its assessment methodology by failing to consider the broad literature and only assessing hazard rather than risk.
On 10 August 2018, Dewayne Johnson, who has non-Hodgkin's lymphoma, was awarded $289 million in damages after a jury in San Francisco found that Monsanto had failed to adequately warn consumers of cancer risks posed by the herbicide, a decision the company plans on appealing. Johnson had routinely used two different glyphosate formulations in his work as a groundskeeper, RoundUp and another Monsanto product called Ranger Pro. The jury's verdict addressed the question of whether Monsanto knowingly failed to warn consumers that RoundUp could be harmful, but not whether RoundUp causes cancer. Court documents from the case show the company's efforts to influence scientific research via ghostwriting. After the IARC classified glyphosate as "probably carcinogenic" in 2015, over 300 federal lawsuits have been filed that were consolidated into a multidistrict litigation called In re: RoundUp Products Liability.
In 1996, Monsanto was accused of false and misleading advertising of glyphosate products, prompting a law suit by the New York State attorney general. Monsanto had made claims that its spray-on glyphosate based herbicides, including Roundup, were safer than table salt and "practically non-toxic" to mammals, birds, and fish, "environmentally friendly", and "biodegradable". Citing avoidance of costly litigation, Monsanto settled the case, admitting no wrongdoing, and agreeing to remove the offending advertising claims in New York State.
Environmental and consumer rights campaigners brought a case in France in 2001 accusing Monsanto of presenting Roundup as biodegradable and claiming that it left the soil clean after use; glyphosate, Roundup's main ingredient, is classed by the European Union as "dangerous for the environment" and "toxic for aquatic organisms". In January 2007, Monsanto was convicted of false advertising. The result was confirmed in 2009.
Falsification of test results
Some tests originally conducted on glyphosate by contractors were later found to be have been fraudulent, along with tests conducted on other pesticides. Concerns were raised about toxicology tests conducted by Industrial Bio-Test Laboratories in the 1970s and Craven Laboratories was found to have fraudulently analysed samples for residues of glyphosate in 1991. Monsanto has stated that the studies have since been repeated.
Genetically modified crops
Roundup was first developed in the 1970s by Monsanto. It was initially used in a similar way to paraquat and diquat, as a non-selective herbicide. Attempts were made to apply glyphosate-based herbicides to row crops, but problems with crop damage kept them from being widely used for this purpose. In the USA, use of Roundup experienced rapid growth following the commercial introduction of a glyphosate-resistant soybean in 1996. "Roundup Ready" became the company trademark for its patented line of crop seed that are resistant to Roundup. Between 1990 and 1996 sales of Roundup increased around 20% per year. As of 2015[update] it is used in over 160 countries. Roundup is used most heavily on corn, soy, and cotton crops that have been genetically modified to withstand the chemical, but since 2012 glyphosate was used in California to treat other crops like almond, peach, cantaloupe, onion, cherry, sweet corn, and citrus.
- Pesticides in the United States
- Pesticide regulation in the United States
- Environmental impact of pesticides
- Health effects of pesticides
- Integrated pest management
- 2,4-Dichlorophenoxyacetic acid
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