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Physiological Mechanisms in the Synergism between Thifensulfuron and Imazethapyr in Sulfonylurea-Tolerant Soybean (Glycine max)

David M. Simpson and E. W. Stoller
Weed Science
Vol. 44, No. 2 (Apr. - Jun., 1996), pp. 209-214
Stable URL: http://www.jstor.org/stable/4045669
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Physiological Mechanisms in the Synergism between Thifensulfuron and Imazethapyr in Sulfonylurea-Tolerant Soybean (Glycine max)
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Abstract

Greenhouse and laboratory experiments were conducted to determine if the synergistic interaction between imazethapyr and thifensulfuron in sulfonylurea-tolerant (STS) soybean involved enhanced absorption and translocation or reduced metabolism of one or both herbicides. Thifensulfuron at 4.4 g ha⁻¹ and imazethapyr at 70 g ha⁻¹ caused 0 and 28% injury to STS soybean 7 DAT, respectively, while the combination of both herbicides caused 50% injury 7 DAT. Imazethapyr had no effect on absorption of ¹⁴C-thifensulfuron into the first trifoliolate. Imazethapyr did not affect absorption, translocation, or metabolism of ¹⁴C-thifensulfuron. Metabolism of ¹⁴C-thifensulfuron was rapid, with less than 10% remaining after 24 h, and was not affected by imazethapyr. Likewise, thifensulfuron did not affect the absorption, translocation, or metabolism of ¹⁴C-imazethapyr. Therefore, the synergism between thifensulfuron and imazethapyr does not involve changes in the absorption, translocation, or metabolism of either herbicide.

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