The effect of mixing two herbicides mesotrione and nicosulfuron on their photochemical reactivity on cuticular wax film

Halle, Alexandra ter; Lavieille, Delphine; Richard, Claire

doi:10.1016/j.chemosphere.2010.01.003

Cited by 34 publications

(11 citation statements)

References 27 publications

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“…In their study, the mesotrione rate of photolysis on leaves was much higher compared with data from the literature in water and on soils which implies that photolysis is likely to be a fast dissipation process on crops, as confirmed later by Barchanska et al . Moreover, mesotrione on wax films imitating the surface of leaves is very reactive, with a DT 50 of photolysis of 2 h .…”

Section: Fate Of Mesotrione In the Environmentmentioning

confidence: 56%

Mesotrione Herbicide: Efficiency, Effects, and Fate in the Environment after 15 Years of Agricultural Use

Carles

Joly

2017

CLEAN Soil Air Water

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Mesotrione (2‐[4‐(methylsulfonyl)‐2‐nitrobenzoyl]‐cylohexane‐1,3‐dione) is an herbicide brought to the market 15 years ago and commonly used on maize cultures. This review summarizes the results obtained from worldwide scientific studies on its efficiency, effects, and fate in environment, in order to bring first overall conclusions about its safety of use. The comprehensive review of the available scientific literature reveals that mesotrione applied as recommended ensures the desired effects on sensitive crops, mainly in post‐emergence application, while exhibiting favorable toxicological, and environmental profile. According to the studies realized so far, mesotrione presents no significant risks to humans and other non‐target organisms or to the environment. Its degradation by soil microorganisms is fast, ensuring a low possibility to retrieve mesotrione in ground water. Its terminal residues in soil, maize, grain, and maize straw are below the limit of quantification. All these results suggest that mesotrione applied as directed ensures the respect of current environmental standards and food safety. Future prospects should focus on its associated pesticides when applied in mixtures on field, and on the detection, quantification, and risk assessment of its transformation products in order to exclude any toxicological synergistic effects.

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Section: Fate Of Mesotrione In the Environmentmentioning

confidence: 56%

Mesotrione Herbicide: Efficiency, Effects, and Fate in the Environment after 15 Years of Agricultural Use

Carles

Joly

2017

CLEAN Soil Air Water

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“…Photochemical reactions between two pesticides can also take place. In our group, we have demonstrated that mixing mesotrione and nicosulfuron (Ter Halle et al, 2010) or chlorothalonil and cycloxydim (Monadjemi et al, 2011) enhances the rate of photodegradation of each of them. Thiophanate-methyl was also shown to favor the photodegradation of methyl-bifenazate (Hamdache et al, 2018).…”

Section: Introductionmentioning

confidence: 95%

Photochemical interactions between pesticides and plant volatiles

Arbid

Sleiman

Richard

2022

Science of The Total Environment

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Among the numerous studies devoted to the photodegradation of pesticides, very scarce are those investigating the effect of plant volatiles. Yet, pesticides can be in contact with plant volatiles after having been spread on crops or when they are transported in surface water, making interactions between the two kind of chemicals possible. The objectives of the present study were to investigate the reactions occuring on plants. We selected thyme as a plant because it is used in green roofs and two pesticides : the fungicide chlorothalonil for its very oxidant excited state and the insecticide imidacloprid for its ability to release the radical NO 2 under irradiation. Pesticides were irradiated with simulated solar light first in a solvent ensuring a high solubility of pesticides and plant volatiles, and then directly on thyme's leaves. Analyses were conducted by headspace gas chromatography-mass spectrometry (HS-GC-MS), GC-MS and liquid chromatography-high resolution mass spectrometry (LC-HRMS). In acetonitrile, chlorothalonil photosensitized the degradation of thymol, -pinene, 3-carene and linalool with high quantum yields ranging from 0.35 to 0.04, and was photoreduced, while thymol underwent oxidation, chlorination and dimerization. On thyme's leave, chlorothalonil was photoreduced again and products arising from oxidation and dimerization of thymol were detected. Imidacloprid photooxidized and photonitrated thymol in acetonitrile, converting it into chemicals of particular concern. Some of these chemicals were also found when imidacloprid was irradiated dispersed on thyme's leaves. These results show that photochemical reactions between pesticides and the plants secondary metabolites 2 can take place in solution as on plants. These findings demonstrate the importance to increase our knowledge on these complex scenarios that concern all the environmental compartments.

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“…It should be noted, however, that the interaction between different agrochemical compounds might influence their photochemical fate, thus influencing the photostability and efficacy of the active compounds. Although several experimental studies , have been performed on the photostability variations of mixed agrochemicals, the mechanism that alters the photostability upon mixture of agrochemicals is not fully understood. Thus, a theoretical insight can potentially provide better insight into the underlying mechanism.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Photoinduced Triplet Intermolecular Hydrogen Transfer between Cycloxydim and Chlorothalonil

et al. 2018

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The possible reaction mechanisms for the experimentally observed hydrogen transfer between the herbicide cycloxydim (CD) and the triplet fungicide chlorothalonil (CT) were identified with density functional theory (DFT) and time-dependent density function theory (TDDFT) computations. Excited energy transfer (EET) calculations indicate that reactants for intermolecular hydrogen transfer were formed via energy transfer from triplet CT to ground state CD. Three possible reaction pathways after EET were identified, and hydrogen transfer from the hydroxyl group on the cyclohexane ring of CD to CT exhibited the lowest energy barrier. Natural population analysis (NPA) along the reaction pathways has confirmed that the pathways involved either electron transfer induced proton transfer or coupled electron-proton transfer, leading to different potential energy profiles. Electrostatic potential (ESP) study substantiated the reaction mechanisms in different pathways. This study suggests an explanation for the accelerated photodegradation of CD by CT and provides a pipeline for future studies of photoinduced intermolecular hydrogen transfer.

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The effect of mixing two herbicides mesotrione and nicosulfuron on their photochemical reactivity on cuticular wax film

Cited by 34 publications

References 27 publications

Mesotrione Herbicide: Efficiency, Effects, and Fate in the Environment after 15 Years of Agricultural Use

Mesotrione Herbicide: Efficiency, Effects, and Fate in the Environment after 15 Years of Agricultural Use

Photochemical interactions between pesticides and plant volatiles

Mechanism of Photoinduced Triplet Intermolecular Hydrogen Transfer between Cycloxydim and Chlorothalonil

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