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1 December 2017 Effect of Pyroxasulfone Formulation on Dissipation from a Winter Wheat Field in Tennessee
Thomas C. Mueller
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Field studies were conducted in 2014 and 2015 in Tennessee to examine pyroxasulfone dissipation under field conditions of winter wheat production. Three formulations were examined: (1) a single component active ingredient in an 85% dry flowable, (2) dry flowable formulation in combination of pyroxasulfone flumioxazin, and (3) a liquid SC formulation of pyroxasulfone carfentrazone. The liquid formulation is a suspo-emulsion. When averaged across the three studies, the DT 50 were 34.4, 30.2 and 29.9 d for pyroxasulfone plus carfentrazone, pyroxasulfone, and pyroxasulfone plus flumioxazin, respectively. These trends would indicate that formulation had little or no effect on pyroxasulfone dissipation in this experiment. Pyroxasulfone DT 50 in all studies ranged from a low of 15.4 d to a high of 53.3 d, and loss was more rapid under warm, moist conditions. These results indicate that pyroxasulfone would last long enough to provide residual weed control, but would not persist excessively to injure rotational crops.

Nomenclature: Pyroxasulfone; wheat, Triticum aestivum L.

© Weed Science Society of America, 2017
Thomas C. Mueller "Effect of Pyroxasulfone Formulation on Dissipation from a Winter Wheat Field in Tennessee," Weed Technology 31(6), 822-827, (1 December 2017).
Received: 21 April 2017; Accepted: 1 June 2017; Published: 1 December 2017

herbicide dissipation
liquid chromatography mass spectrometry (LCMS)
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