Sorption of the nematicide fluensulfone in six UK arable soils – implications for control of the potato cyst nematode Globodera pallida

in Nematology
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Batch adsorption experiments were performed to determine the sorption of the nematicide fluensulfone as a technical-grade and a granular formulation (as Nimitz 15G) in six UK arable soils. The Freundlich and equilibrium sorption coefficients KF and KD, respectively, were generally low. KF and KD correlated positively with soil organic matter in all instances. The sorption kinetics was similar for both forms, but the KD was about four times lower for Nimitz 15G than the technical-grade, suggesting concentration dependency of fluensulfone sorption. The low sorption of fluensulfone across the soils indicates that partitioning of fluensulfone to the soil liquid phase may be unlimited. Therefore, substantial availability in the soil to be effective is likely. Sorption, therefore, may not limit fluensulfone efficacy. Nonetheless, these results call for cautious use of the nematicide because leaching is possible.

Sorption of the nematicide fluensulfone in six UK arable soils – implications for control of the potato cyst nematode Globodera pallida

in Nematology

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Figures

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    Fluensulfone sorption isotherms for (A) six UK arable soils collected from Cambridgeshire (Soil WC), Lincolnshire (Soils GL, WL, KL), Nottinghamshire (Soil MN), and Shropshire (Soil HS), and (B) Soil HS treated with peat (PT) at five levels.

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    Percentage sorption of technical-grade and granular formulation (as Nimitz 15G) of fluensulfone in a Shropshire sandy clay loam treated with peat (PT) at five levels.

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    Plots of equilibrium sorption coefficient KD, determined for technical-grade or granular fluensulfone (as Nimitz 15G), against levels of peat treatment (PT). Data points are means; n = 3.

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    Eight hour sorption kinetics for nematicide fluensulfone as a (A) granular formulation (Nimitz 15G) and (B) technical-grade in five UK arable soils.

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    Comparisons of equilibrium sorption coefficient KD, obtained for nematicide fluensulfone sorption in the technical grade form and the granular formulation (Nimit 15G) by five UK arable soils. Mean coefficients are presented with standard error of the mean; n = 3. See Table 1 for key to abbreviations.

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