Behavior of mixed formulation of metalaxyl and dimethomorph in grape and soil under field conditions

Liu, Congyun; Wan, Kai; Huang, Jianxiang; Wang, Youcheng; Wang, Fuhua

doi:10.1016/j.ecoenv.2012.06.030

Cited by 40 publications

(24 citation statements)

References 13 publications

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“…The use of an n>1-order exponential model did not show a significant improvement (data not shown), which is consistent with other field studies (e.g., Pasarella et al, 2009;Liang et al, 2012). Several authors have reported a higher dissipation rate in the field during the first week after application, followed by a slow dissipation rate during the second or third weeks for table and wine grapes (Cabras et al, 2001;Mandal et al, 2010;Liu et al, 2012). However, in this study, dissipation rates were stable during the entire study period (approximately six weeks).…”

Section: Pesticide Grape Berry Dissipationsupporting

confidence: 80%

Effects of wine grape cultivar, application conditions and the winemaking process on the dissipation of six pesticides

Alister

Araya

Morandé³

et al. 2014

Cienc. Inv. Agr.

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Pesticide residue in primary products is an important issue for producers and consumers, even though little information is available on the effect of application conditions on residue persistence and the transfer to primary elaborated products. During the 2012 season, field and laboratory studies were conducted to determine the dissipation of lambda-cyhalothrin, buprofezin, pyrimethanil, tebuconazole, imidacloprid and acetamiprid in Sauvignon blanc and Pinot Noir cultivars and their residue dynamics during the winemaking process. Half-life values (DT 50 ) for each pesticide applied alone and as a tank mix of all pesticides were similar and had averages of 6.4, 14.0, 19.7, 26.0, 14.5 and 13.4 days for lambda-cyhalothrin, buprofezin, pyrimethanil, tebuconazole, imidacloprid and acetamiprid, respectively. The grape cultivar did not affect pesticide DT 50 . All pesticides were transferred from the raw material (grape) to red and white wines except lambdacyhalothrin. The transfer factors of buprofezin, tebuconazole pyrimethanil, imidacloprid and acetamiprid ranged from 3 to 23% in red wine and 9 to 30% in white wine. Alcoholic fermentation, pressing (through pomace) and malolactic fermentation were the steps in which the greatest residue losses occurred in red wine, whereas pressing (through the grape and stem), alcoholic fermentation and clarification with bentonite had the greatest residue loss in white wine. In both cases, bottled wine showed substantial residue reduction after ten months.

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Section: Pesticide Grape Berry Dissipationsupporting

confidence: 80%

Effects of wine grape cultivar, application conditions and the winemaking process on the dissipation of six pesticides

Alister

Araya

Morandé³

et al. 2014

Cienc. Inv. Agr.

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“…DT 50 values ranged between 16 and 23 days, whereas DT 90 values ranged between 52 and 76 days (Table 2). Our DT 50 values are somewhat lower than the average value of 46 days reported by the PPDB (2016) for the field dissipation of metalaxyl, but within the range of 9 and 70 days observed in different field studies where metalaxyl was applied to unamended and organically-amended soils (Kookana et al, 1995;Liu et al, 2012;Triantafyllidis et al, 2013). The enhanced persistence of metalaxyl in the top 0-5 cm soil layer after amending the soil with clay was most likely a consequence of the higher sorption exerted by the amendment (Table 1), which reduced not only the leaching of the fungicide to deeper soil layers, but also its bioavailability to be degraded, as suggested by other authors for organically-amended soils (Fernandes et al, 2006;Rodríguez-Cruz et al, 2012) and supported by the results of the enantioselective study presented in the next section.…”

Section: Fungicide Persistence and Leachingcontrasting

confidence: 57%

Effect of synthetic clay and biochar addition on dissipation and enantioselectivity of tebuconazole and metalaxyl in an agricultural soil: Laboratory and field experiments

Gámiz

López-Cabeza

Facenda

et al. 2016

Agriculture, Ecosystems & Environment

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A B S T R A C TLaboratory and field experiments were conducted to assess how the addition of oleate-modified hydrotalcite (clay) and biochar (BC) to an agricultural soil affected the sorption, leaching, persistence, and enantiomeric composition of soil residues of two chiral fungicides, tebuconazole and metalaxyl. Laboratory experiments showed that the sorption of both fungicides ranked as follows: unamended soil < BC-amended soil < clay-amended soil. The addition of clay at a rate of 1% increased metalaxyl soil sorption coefficient (K d ) from 0.34 to 3.14 L kg À1 and that of tebuconazole from 2.4 to 47.4 L kg À1 . In our experimental set-up, field plots were either unamended or amended with clay (2 t ha À1 ) or BC (4 t ha À1 ), and subsequently treated with a mixture of tebuconazole and metalaxyl at 3 and 6 kg ha À1 , respectively. The leaching, persistence, and enantiomer composition of fungicides residues were monitored by sampling at different soil depths (0-5, 5-10, 10-20 cm) for 98 days. No significant changes in the scarce mobility and long persistence of tebuconazole upon amending the soil with clay or BC were observed. In contrast, sorption to clay and BC particles reduced the leaching and degradation of metalaxyl and the clay increased its persistence in the topsoil compared to the unamended soil. The enantioselective analysis of tebuconazole and metalaxyl soil residues indicated that tebuconazole remained mostly racemic along the experiment, whereas for metalaxyl the concentration of S-enantiomer was greater than the concentration of R-enantiomer, more so at longer experimental times and deeper horizons. Nevertheless, for the top 0-5 cm soil layer metalaxyl remained more racemic in clay-and BC-amended soil than in unamended soil. Our results show that addition of amendments with high sorptive capacities can be beneficial in reducing leaching and degradation losses of chiral pesticide enantiomers from the topsoil, and that sorption by the amendments can influence the final enantiomeric composition of pesticide residues.

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“…The half‐life of metalaxyl was observed to be 1.3 and 0.4 days in tomato at single and double the application rate respectively . It has been shown that metalaxyl dissipates faster in grape (half‐life value 4.9 days) than in soil (half‐life value 8.7 days) . The R ‐form of metalaxyl dissipated more rapidly, with half‐life values of 2.8, 3.7 and 2.4 days in cucumber, cabbage and spinach respectively .…”

Section: Resultsmentioning

confidence: 93%

“…To optimise the mass conditions, the reference standard of metalaxyl was directly infused in the mobile phase to the Triple‐Quad for confirmative conditions in MRM mode. The precursor ion of metalaxyl in electrospray ionisation (ESI+) mode was m / z 280 [M + H] + . The fragmentor voltage for metalaxyl was 90 V. The MRM transitions of the fungicide were m / z 280 → 220 (collision energy 5 V), 280 → 160 (collision energy 20 V).…”

Section: Methodsmentioning

confidence: 91%

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Dissipation behaviour, processing factors and risk assessment for metalaxyl in greenhouse‐grown cucumber

Ramezani

Shahriari

2014

Pest Management Science

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Behavior of mixed formulation of metalaxyl and dimethomorph in grape and soil under field conditions

Cited by 40 publications

References 13 publications

Effects of wine grape cultivar, application conditions and the winemaking process on the dissipation of six pesticides

Effects of wine grape cultivar, application conditions and the winemaking process on the dissipation of six pesticides

Effect of synthetic clay and biochar addition on dissipation and enantioselectivity of tebuconazole and metalaxyl in an agricultural soil: Laboratory and field experiments

Dissipation behaviour, processing factors and risk assessment for metalaxyl in greenhouse‐grown cucumber

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