Dissipation kinetics and consumer risk assessment of novaluron + lambda-cyhalothrin co-formulation in cabbage

Sharma, Krishan Kumar; Tripathy, Vandana; Mohapatra, Soudamini; Matadha, Nagapooja Yogendraiah; Pathan, Abdul Rashid Khan; Sharma, Badri Narayan; Dubey, Jatiender Kumar; Katna, Sapna; George, Thomas J.; Tayade, Amol B.; Sharma, Khushbu; Walia, Suresh

doi:10.1016/j.ecoenv.2020.111494

Cited by 35 publications

(9 citation statements)

References 32 publications

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“…They reported that these other products slowed down the degradation in mixture 1 (azoxystrobin, imidacloprid, and metalaxyl‐M) and mixture 2 (boscalid, chlorpyrifos ethyl, and hexythiazox). There are also studies on the degradation processes of ready‐mix formulations 7,41 …”

Section: Resultsmentioning

confidence: 99%

“…There are also studies on the degradation processes of ready-mix formulations. 7,41 The use of pesticides in mixtures leads to slower degradation and higher residues with some active ingredients and faster degradation and fewer residues with other active ingredients. Pesticides that slow down the degradation of other pesticides may pose a risk to human health.…”

Section: General Assessment Of Dissipation Kinetics Of Pesticidesmentioning

confidence: 99%

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Dissipation kinetics of some pesticides applied singly or in mixtures in/on grape leaf

Balkan

Kara

2022

Pest Management Science

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BACKGROUND: Grape and leaf quality are often severely reduced by fungi such as grey rot Botrytis cinerea Pers., powdery mildew Erysiphe necator Schwein, and downy mildew Plasmopara viticola (Berk. & M.A.Curtis) Berl. & De Toni and by insects such as Otiorhynchus spp., European grapevine moth Lobesia botrana Den.-Schiff., vine mealybug Planococcus citri Risso, and grape erineum mite Colomerus vitis Pgst. Various pesticides are often applied to mitigate these pest problems. These chemicals used singly as well as in the form of a mixture can leave residues on or in the crop. It is therefore of great importance to study the dissipation of the pesticides applied alone and in mixtures to this crop to protect consumers. RESULTS:The dissipation kinetics of cypermethrin, boscalid, deltamethrin, kresoxim-methyl, lambda-cyhalothrin, metalaxyl-M, metrafenone, and triadimenol residues were studied in vine leaves grown under sunny conditions in Turkey. The dissipation rate for singly applied pesticides followed first-order kinetics, with half-lifes in grape leaves in the range of 1.85-7.22 days. Changes in the degradation process of pesticide residues were determined after application, as both single applications and mixtures. The degradation of boscalid, cymoxanil, deltamethrin and metalaxyl-M accelerated while the degradation of cypermethrin, kresoxim-methyl, and lambda-cyhalothrin slowed down in mixtures of pesticides.CONCLUSION: The use of pesticides in mixtures leads to slower degradation and higher residues for some active ingredients and faster degradation and fewer residues for other active ingredients. Therefore, pesticide mixtures should not be applied in the field without having detailed information about their ingredients.

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Section: Resultsmentioning

confidence: 99%

Section: General Assessment Of Dissipation Kinetics Of Pesticidesmentioning

confidence: 99%

Dissipation kinetics of some pesticides applied singly or in mixtures in/on grape leaf

Balkan

Kara

2022

Pest Management Science

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“…Adhesion is inversely related to droplet size, droplet velocity, and incidence angle on the leaf [ 37 ], and if the spraying volume increases, the amount of pesticide applied to the crops and adhesion increases [ 3 ]. However, after a threshold, the amount of adhesion may not increase.…”

Section: Resultsmentioning

confidence: 99%

Dissipation and Distribution of Picarbutrazox Residue Following Spraying with an Unmanned Aerial Vehicle on Chinese Cabbage (Brassica campestris var. pekinensis)

Kim¹,

Jeong²,

Kyung

et al. 2021

Molecules

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We assessed the residual distribution and temporal trend of picarbutrazox sprayed by agricultural multicopters on Chinese cabbage and considered fortification levels and flying speeds. In plot 2, 14 days after the last spraying, the residues decreased by ~91.3% compared with those in the samples on day 0. The residues in the crops decreased by ~40.8% of the initial concentration owing to growth (dilution effect) and by ~50.6% after excluding the dilution effect. As the flight speed increased, picarbutrazox residues decreased (p < 0.05, least significant deviation [LSD]). At 2 m s−1 flight speed, the residual distribution differed from the dilution rate of the spraying solution. The average range of picarbutrazox residues at all sampling points was 0.007 to 0.486, below the limit of quantitation −0.395, 0.005–0.316, and 0.005–0.289 mg kg−1 in plots 1, 2, 3, and 4, respectively, showing significant differences (p < 0.05, LSD). These results indicated that the residual distribution of picarbutrazox sprayed by using a multicopter on the Chinese cabbages was not uniform. However, the residues were less than the maximum residue limit in all plots. Accordingly, picarbutrazox was considered to have a low risk to human health if it was sprayed on cabbage according to the recommended spraying conditions.

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“…(2) LOQ is the minimum additive concentration that can be detected by the established method in the additive recovery experiment, 20 and LOD is the lowest amount (standard solution) producing a peak with a signal-to-noise ratio of 3. 20,21 (3) The matrix effect is a common phenomenon in the HPLC-MS/MS analysis process and has a certain impact on the quantitative analysis of the target analyte. IUPAC defines the matrix effect as the "comprehensive impact of all components in the sample except for the analyte on the measured value".…”

Section: Methods Validationmentioning

confidence: 99%

Dissipation and Risk Assessment of Propaquizafop in Ginseng under Field Conditions

Cheng,

Xiong,

et al. 2024

J. Agric. Food Chem.

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Propaquizafop is a highly efficient aryloxy phenoxy propionate chiral herbicide. However, the use of propaquizafop, including its safe use methods, residue patterns, dietary risk assessment, and maximum residue limits, for ginseng, a traditional Chinese medicinal plant, has not been studied. An analytical method was established for the simultaneous determination of propaquizafop and its four metabolites in ginseng soil, fresh ginseng, ginseng plant, and dried ginseng using HPLC-MS/MS. This approach showed good linearity (R 2 ranging from 0.9827 to 0.9999) and limit of quantification ranging from 0.01 to 0.05 mg/kg. The intra-and interday recovery rates of this method ranged from 71.6 to 107.1% with relative standard deviation ranging from 1.3 to 23.2%. The method was applied to detect residual samples in the field, and it was found that the degradation of propaquizafop in ginseng plants and soil followed a first-order kinetic equation. R 2 was between 0.8913 and 0.9666, and the half-life (t 1/2 ) ranged from 5.04 to 8.05 days, indicating that it was an easily degradable pesticide (T 1/2 < 30 days). The final propaquizafop residues in ginseng soil, plants, fresh ginseng, and dried ginseng ranged from 0.017 to 0.691 mg/kg. A dietary risk assessment was conducted on the final propaquizafop residue in fresh and dried ginseng. The results showed that the chronic exposure risk quotient values were less than 100% for fresh and dried ginseng (1.15% for fresh ginseng and 1.13% for dried ginseng). This illustrates that the dietary risk associated with the use of 10% propaquizafop emulsifiable concentrate in ginseng is very low. Thus, applying 750 mL/ha of propaquizafop on ginseng could not pose an unacceptable risk to public health. The results of the present study support the registration of propaquizafop in ginseng.

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Dissipation kinetics and consumer risk assessment of novaluron + lambda-cyhalothrin co-formulation in cabbage

Cited by 35 publications

References 32 publications

Dissipation kinetics of some pesticides applied singly or in mixtures in/on grape leaf

Dissipation kinetics of some pesticides applied singly or in mixtures in/on grape leaf

Dissipation and Distribution of Picarbutrazox Residue Following Spraying with an Unmanned Aerial Vehicle on Chinese Cabbage (Brassica campestris var. pekinensis)

Dissipation and Risk Assessment of Propaquizafop in Ginseng under Field Conditions

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