Skip to main content
ARS Home » Southeast Area » Tifton, Georgia » Crop Protection and Management Research » Research » Publications at this Location » Publication #335323
Title: Fluensulfone sorption and mobility as affected by soil type

Author
item MORRIS, KELLY - University Of Georgia
item LI, XIAO - Auburn University
item LANGSTON, DAVID - Virginia Tech
item Davis, Richard
item Timper, Patricia - Patty
item GREY, TIMOTHY - University Of Georgia

Submitted to: Pest Management Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/4/2017
Publication Date: 10/18/2017
Citation: Morris, K.A., Langston, D.B., Davis, R.F., Timper, P., Li, X., Grey, T.L. 2017. Fluensulfone sorption and mobility as affected by soil type. Pest Management Science. 74:430-437. https://doi.org/10.1002/ps.4724.
DOI: https://doi.org/10.1002/ps.4724

Interpretive Summary: Fluensulfone is a chemical that kills multiple types of plant-parasitic nematodes, and it is in a different chemical class from other nematicides. The binding to (adsorption) and release from (desorption) soil as well as the mobility of fluensulfone was evaluated on multiple soils from the United States in laboratory and column experiments. Soil adsorption of fluensulfone increased as organic matter or clay increased but decreased as sand content increased. Fluensulfone soil desorption increased as pH and cation exchange capacity increased. The amount of fluensulfone desorption from various soil types ranged from 26% to 70%. In mobility experiments on Arredondo sand, fluensulfone in water leaching from the soil columns peaked at 3 hours, gradually declining and becoming undetectable after 9 hours. Recovery from water leached from the columns was 45% of the initial fluensulfone applied to the soil surface. In separate experiments, 30 cm long soil columns were saturated with 1 L of water, and then segregated into three-10 cm sections. Fluensulfone recovery was 41, 34, 29, and 13% in Chualar sandy loam, Arredondo sand, Greenville sandy clay loam, and Tifton loamy sand, respectively in the top 10 cm section. We conclude that soil organic matter and clay contents will affect sorption, mobility, and dissipation of fluensulfone.

Technical Abstract: Fluensulfone is a fluoroalkenyl chemistry with activity against multiple types of plant-parasitic nematodes. The adsorption, desorption, and mobility of fluensulfone was evaluated on multiple soils from the United States in laboratory and column experiments. Adsorption data regressed to the logarithmic Freundlich equation resulted in isotherm values of 1.24 to 3.28. Soil adsorption of fluensulfone positively correlated with organic matter (0.67) and clay (0.34), but negatively with sand (-0.54). Fluensulfone soil desorption correlated to pH (0.38) and cation exchange capacity (0.44). Fluensulfone desorption from Arredondo sand soil was 26%, other soils ranged from 43 to 70%. In mobility experiments, fluensulfone in the leachate peaked at 3 hours, gradually declining and becoming undetectable after 9 hours. Recovery from leachate was 45% of the initial fluensulfone applied to the soil surface. In separate experiments, 30 cm long soil columns were saturated with 1 L of water, and then segregated into three-10 cm sections. Fluensulfone recovery was 41, 34, 29, and 13% in Chualar sandy loam, Arredondo sand, Greenville sandy clay loam, and Tifton loamy sand, respectively in the top 10 cm section. We conclude that soil organic matter and clay contents will affect sorption, mobility, and dissipation of fluensulfone.