Evaluation of Juvenile Freshwater Mussel Sensitivity to Multiple Forms of Florpyrauxifen-Benzyl

Buczek, Sean B.; Archambault, Jennifer M.; Cope, W. Gregory; Heilman, Mark A.

doi:10.1007/s00128-020-02971-1

Cited by 6 publications

(5 citation statements)

References 28 publications

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“…(Beets and Netherland 2018;Mudge et al 2021;Netherland and Richardson 2016;Richardson et al 2016;Sperry et al 2021). Additionally, florpyrauxifen-benzyl was classified by the U.S. Environmental Protection Agency as a reduced-risk herbicide (USEPA 2017) with favorable toxicological profiles (Buczek et al 2020).…”

Section: Management Implicationsmentioning

confidence: 99%

Susceptibility of native and invasive submersed plants in New Zealand to florpyrauxifen-benzyl in growth chamber exposure studies

Howell

Hofstra

Heilman

et al. 2022

Invasive plant sci. manag.

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Invasive aquatic plants constantly threaten freshwaters and associated environs globally. Water resource managers frequently seek new control tactics to combat invasive macrophytes, especially when the availability of herbicides registered for submersed plant control is limited. The synthetic auxin herbicide, florpyrauxifen-benzyl, recently registered (2018) for aquatic site applications in the United States, has shown success in controlling several invasive aquatic weeds. Studies were conducted to evaluate native and invasive submersed plant response to florpyrauxifen-benzyl under growth chamber conditions to provide insight on the selectivity of varying herbicide concentrations in New Zealand. Florpyrauxifen-benzyl concentrations evaluated ranged from 0.01 to 107.86 µg ai L-1, encompassing the maximum use concentration (48 µg ai L-1) for submersed plant applications. Dose-response metrics indicated the New Zealand native species, Myriophyllum triphyllum, was highly sensitive to florpyrauxifen-benzyl following a 21-day static exposure, having a dry weight 50% effective concentration (EC50) value of 1.2 µg ai L-1. The invasive species Lagarosiphon major and Elodea canadensis were less sensitive, with dry weight EC50 values of 35.4 and >107.86 µg ai L-1, respectively. Egeria densa was most tolerant to the tested concentrations, as EC50 values were not achieved. Overall, results indicate florpyrauxifen-benzyl demonstrates potential for controlling L. major, with further large-scale screening required to confirm control among field site applications. Since the native species (M. triphyllum) was most sensitive to florpyrauxifen-benzyl compared to the invasive plant evaluated (I/N ratio indicated >31.3 times more sensitive), any targeted concentration used for invasive plant control for field applications would likely injure the native M. triphyllum plants. Future studies should investigate additional native and invasive species for management guidance, and consider how exposure times influence plant response using similar florpyrauxifen-benzyl concentrations tested in the present study.

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Section: Management Implicationsmentioning

confidence: 99%

Susceptibility of native and invasive submersed plants in New Zealand to florpyrauxifen-benzyl in growth chamber exposure studies

Howell

Hofstra

Heilman

et al. 2022

Invasive plant sci. manag.

Self Cite

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“…[6][7][8][9] The toxicity of this compound to humans and the environment has been the objective of studies in Brazil and in other countries. [10][11][12] Therefore, the insertion of this active ingredient in the environment must be monitored in detail, as the use of this product may cause episodes of environmental and human contamination, and its impacts are still poorly studied. [10][11][12] This herbicide has low water solubility (< 0.015 mg L -1 ) and high affinity for nonpolar organic solvents.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12] Therefore, the insertion of this active ingredient in the environment must be monitored in detail, as the use of this product may cause episodes of environmental and human contamination, and its impacts are still poorly studied. [10][11][12] This herbicide has low water solubility (< 0.015 mg L -1 ) and high affinity for nonpolar organic solvents. 5,10,13,14 These characteristics are very favorable for contamination and accumulation in soils, plants, as well as entering the food chain, since some rice varieties have been cultivated in highly irrigated soils.…”

Section: Introductionmentioning

confidence: 99%

Extraction Method for Determining Florpyrauxifen-benzyl Herbicide in Soil

Lopes¹,

Sicupira²,

Silvério³

2023

J. Braz. Chem. Soc.

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Florpyrauxifen-benzyl is the new active ingredient authorized by Brazilian legislation, which acts as herbicide and may be used to control weeds in rice cultivation, but studies on toxicity to humans and the environment are still under review. Due to recent insertion in the world pesticide market, there are still few studies related to the extraction and detection methodologies of this compound. Therefore, this study aimed to optimize and validate solid-liquid extraction with low temperature purification (SLE-LTP) for determining florpyrauxifen-benzyl in soil using highperformance liquid chromatography coupled to a diode array detection (HPLC-DAD). The results showed that the best conditions were achieved using Poroshell column, a temperature of 30 °C, mobile phase composition of acetonitrile:water (85:15 v/v) acidified with formic acid 0.1% (v/v), a flow rate of 0.3 mL min-1, and 243 nm as the wavelength. The best extracting phase was acetonitrile acidified with formic acid 0.1% (v/v) which achieved a recovery rate ca. 100% and relative standard deviation (RSD) less than 3.9%. The methodology was precise, accurate, linear and selective, with a limit of quantification of 20 μg kg-1. The stability study of this compound in soil showed that approximately 17.5 days is the half-life of florpyrauxifen-benzyl in soil.

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“…Florpyrauxifen-benzyl exhibits excellent herbicidal activities against all kinds of weeds at lower concentrations of 5–20 g/ha . In addition, florpyrauxifen-benzyl showed no acute toxicity to juvenile Fatmucket ( Lampsilis siliquoidea ) and Eastern Lampmussel ( Lampsilis radiata ), indicating a minimal risk of short-term exposure from forpyrauxifen-benzyl in the environment for application to aquatic weeds …”

Section: Synthetic Carboxylic Acids and Their Derivatives For Herbici...mentioning

confidence: 99%

“…47 In addition, florpyrauxifen-benzyl showed no acute toxicity to juvenile Fatmucket (Lampsilis siliquoidea) and Eastern Lampmussel (Lampsilis radiata), indicating a minimal risk of short-term exposure from forpyrauxifen-benzyl in the environment for application to aquatic weeds. 48 According to Dow AgroSciences statistics, the use of synthetic auxin herbicides reached 366 million ha in 2014. The globally excessive and incorrect use of auxinic herbicides has to date resulted in strong resistance to this type of herbicide by a variety of weeds including 30 kinds of broadleaf species, 5 kinds of grasses, and 1 grass-like weed species.…”

Section: Synthetic Carboxylic Acids and Their Derivatives For Herbici...mentioning

confidence: 99%

Carboxylic Acid Derivatives in Herbicide Development

Cai

Gan

Jin

et al. 2023

J. Agric. Food Chem.

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Carboxylic acids and their derivatives are extensively found in natural and non-natural compounds with proven bioactivities. They have made great contributions to the development of herbicides and herbicidal lead structures in the past 70 years. Carboxylic acid-related herbicidal molecules have targeted a diversity of biosynthetic pathways, proteins, enzymes, energetic metabolism systems, and other reaction sites through different mechanisms. It is significant and helpful for us to know the herbicidal targets and mechanisms of the carboxylic acid-related herbicides as well as the basic rules for the design and development of herbicidal lead structures. We therefore summarize here the overall development of carboxyl group-containing herbicides and herbicidal molecules in the past 20 years based on their structural properties and herbicidal mechanisms.

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Evaluation of Juvenile Freshwater Mussel Sensitivity to Multiple Forms of Florpyrauxifen-Benzyl

Cited by 6 publications

References 28 publications

Susceptibility of native and invasive submersed plants in New Zealand to florpyrauxifen-benzyl in growth chamber exposure studies

Susceptibility of native and invasive submersed plants in New Zealand to florpyrauxifen-benzyl in growth chamber exposure studies

Extraction Method for Determining Florpyrauxifen-benzyl Herbicide in Soil

Carboxylic Acid Derivatives in Herbicide Development

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