glyphosate Articles
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Questions concerning the potential impact of glyphosate‐based herbicides on amphibians
Use of glyphosate‐based herbicides is increasing worldwide. Here we review the available data related to potential impacts of these herbicides on amphibians and conduct a quantitative meta‐analysis. Because only a little is known about environmental concentrations of glyphosate in amphibian habitats, and virtually nothing about environmental concentrations of the substances added to the ...
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Interactive effects of temperature and glyphosate on the behavior of blue ridge two‐lined salamanders, Eurycea wilderae
The objective of the present study was to evaluate the potential interactive effects of stream temperatures and environmentally relevant glyphosate‐based herbicide concentrations on movement and anti‐predator behaviors of larval Eurycea wilderae (Blue Ridge two‐lined salamander). Larval salamanders were exposed to one of four environmentally relevant glyphosate concentrations (0.00 µg a.e./L, ...
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Effects of low levels of herbicides on prairie species of the Willamette Valley, Oregon
The relative sensitivity of 17 non‐crop plant species from Oregon's Willamette Valley was determined in response to glyphosate, tribenuron methyl (tribenuron) and fluazifop‐P‐butyl (fluazifop) herbicides. For glyphosate; Elymus trachycaulus, Festuca arundinacea, Madia elegans, Potentilla gracillis and Ranunculus occidentalis were the most sensitive species, based on a concentration calculated ...
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Adsorption of glyphosate on variable-charge, volcanic ash–derived soils
Glyphosate (N-phosphonometylglycine) is widely used due to its broad spectrum of activity and nonselective mode of action. In Chile it is the most used herbicide, but its adsorption behavior in the abundant and widespread variable charge soils is not well understood. In this study, three volcanic ash–derived soils were selected, including Andisols (Nueva Braunau and Diguillin) and Ultisols ...
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Potential risks to freshwater aquatic organisms following a silvicultural application of herbicides in Oregon's Coast Range
Glyphosate, aminomethylphosphonic acid (AMPA), imazapyr, sulfometuron methyl (SMM), and metsulfuron methyl (MSM) were measured in streamwater collected during and after a routine application of herbicides to a forestry site in Oregon's Coast Range. Samples were collected at three stations: HIGH at the fish/no‐fish interface in the middle of the harvest/spray unit; MID at the bottom of the ...
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No-tillage improves broomrape control with Glyphosate in Faba-Bean
Broomrape (Orobanche crenata Forsk.) causes considerable losses in faba-bean (Vicia faba L.) production in the Mediterranean region. The application of an ultra-low glyphosate rate at an early broomrape parasitic phase, i.e., tubercle development, is the most common control system. This study sought to determine the effect of tillage system and glyphosate application on broomrape infestation, ...
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Inhibition effect of glyphosate on the acute and subacute toxicity of cadmium to earthwom Eisenia fetida
The acute and subacute toxicities of Cd to earthworm Eisenia fetida (E.fetida) in the presence and absence of glyphosate (GPS) were studied. Cd is highly toxic to E. fetida, while the presence of GPS markedly reduced the acute toxicity of Cd to earthworm, as both the mortality rate of the earthworms and the accumulation of Cd decreased with the increase of GPS/Cd molar ratio. The subcellular ...
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Glyphosate and AMPA chronic risk assessment for soil biota
Glyphosate is a broad‐spectrum herbicide used widely in agriculture, horticulture, private gardens and in public infrastructure, where it is applied to areas such as road sides, railway tracks and parks to control the growth of weeds. The exposure risk from glyphosate and the primary soil metabolite aminomethylphosphonic acid (AMPA) on representative species of earthworms, springtails, ...
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Effects of glyphosate on egg incubation, larvae hatching and ovarian re‐maturation, in the estuarine crab Neohelice granulata
Ovigerous females of the estuarine crab Neohelice granulata were exposed to both pure glyphosate (2.5 and 5 mg/L) and a glyphosate formulation (Roundup Ultramax, containing glyphosate at 2.5 mg/L acid equivalent). At the end of the egg incubation period, a significant reduction in the number of hatched larvae was seen due to Roundup exposure. Additionally, several larvae abnormalities were ...
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Potential for delayed orchardgrass seeding during glyphosate-resistant alfalfa establishment
Few herbicides are labeled for weed control when establishing alfalfa (Medicago sativa L.)-grass mixtures. Varying the planting date of the grass in relation to alfalfa and adjusting herbicide application timing could improve weed control and forage grass safety. The research objective was to evaluate the use of glyphosate [N-(phosphonomethyl) glycine] for weed control in seedling ...
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Potential for delayed orchardgrass seeding during glyphosate-resistant alfalfa establishment
Few herbicides are labeled for weed control when establishing alfalfa (Medicago sativa L.)-grass mixtures. Varying the planting date of the grass in relation to alfalfa and adjusting herbicide application timing could improve weed control and forage grass safety. The research objective was to evaluate the use of glyphosate [N-(phosphonomethyl) glycine] for weed control in seedling ...
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Influence of nonoptimal ripener applications and postharvest residue retention on sugarcane second ratoon yields
Retention of sugarcane (interspecific hybrids of Saccharum spp.) postharvest residue and certain glyphosate ripener application regimes may independently reduce yields of the subsequent ratoon crop in wet climates. The objective of this experiment was to determine the effects of ripener application and ripener treatment to harvest intervals (THI) on yields of the treated first ratoon, and the ...
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EPA Issues Guidance Regarding Prop 65 Labeling Requirements for Glyphosate Products and OEHHA Responds
On August 7, 2019, EPA took long awaited action concerning the inclusion of Prop 65 warning statements for glyphosate on EPA registered pesticide labels, which will likely impact the broader ongoing debate over EPA approval of Prop 65 warnings on pesticide labels. EPA’s August 7, 2019, letter to glyphosate registrants states that EPA “will no longer approve labeling that includes the ...
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The effects of single and multiple applications of glyphosate or aminopyralid on simple constructed plant communities
To determine effects of multiple applications of herbicides on small constructed plant communities, Prunella vulgaris L.var. lanceolata Fern, Festuca roemeri (Pavlick) Alexeev, Clarkia amoena (Lehm.) Nels. and Cynosurus echinatus L. were grown together in small field plots. Plants were treated with glyphosate at target concentrations of 0, 0.01, 0.1, and 0.2 x a field application rate (FAR) of ...
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Particle-facilitated pesticide leaching from differently structured soil monoliths
Received for publication September 19, 2008. The leaching of soil particles and surface applied 14C-labeled glyphosate and pendimethalin from intact soil columns (height: 50 cm; diameter: 30 cm) were investigated, and the relative significance of particle-facilitated pesticide transport was quantified. Investigations were performed with a recently plowed (four columns) and an untilled (five ...
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The direct and indirect effects of a glyphosate‐based herbicide and nutrients on Chironomidae (Diptera) emerging from small wetlands
Laboratory and mesocosm experiments have demonstrated that some glyphosate‐based herbicides can have negative effects on benthic invertebrate species. Although these herbicides are among the most widely used in agriculture, there have been few multiple‐stressor, natural system based investigations of the impacts of glyphosate‐based herbicides in combination with fertilizers on the emergence ...
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Evaluating exposure and potential effects on honeybee brood (Apis mellifera) development using glyphosate as an example
This study aimed to develop an approach to evaluate potential effects of plant protection products on honeybee brood with colonies at realistic worst‐case exposure rates. The approach comprised two stages. In the first stage, honeybee colonies were exposed to a commercial formulation of glyphosate applied to flowering Phacelia tanacetifolia with glyphosate residues quantified in relevant ...
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Variation in amphibian response to two formulations of glyphosate‐based herbicides
Variation in toxicity among formulations and species makes it difficult to extrapolate results to all species and all formulations of herbicides. We exposed larval wood frogs (Lithobates sylvaticus) from four populations to two glyphosate‐based herbicides, Roundup Weed and Grass Control™ and Roundup WeatherMax™. 96 hour LC50 values for both formulations varied among the populations (RWGC: 0.14 ...
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Yield, quality, and fruit distribution in bollgard/roundup ready and bollgard ii/roundup ready flex cottons
New transgenic cotton (Gossypium hirsutum L.) technologies Bollgard II/Roundup Ready Flex (BGII/RRF) provide additional mechanisms for the cotton crop to retain early initiated fruiting structures positioned in the lower canopy. It may be possible, therefore, for early fruit retention to become too high with these new technologies resulting in early cutout and reduced yield. The objective of this ...
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Toxicity of Cúspide 480SL® spray mixture formulation of glyphosate to aquatic organisms
In 2011, a formulation of glyphosate called Cúspide 480SL® was chosen to replace Roundup‐SL®, Fuete‐SL®, and Gly‐41® for the control of Erythroxylum coca in Colombia. Cúspide 480SL contains the active ingredient glyphosate isopropylamine (IPA) salt, which is the same active ingredient used in previous formulations. However, Cúspide 480SL contains an alkyl polyglycoside surfactant rather than ...
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