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Persistence of Rimsulfuron on Perennial Ryegrass (Lolium perenne) and Annual Bluegrass (Poa annua) Foliage

Published online by Cambridge University Press:  20 January 2017

Whitnee L. Barker ,
Josh B. Beam  and
Shawn D. Askew
Whitnee L. Barker
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Box 0330, Blacksburg, VA 24060-0330
Josh B. Beam
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Box 0330, Blacksburg, VA 24060-0330
Shawn D. Askew*
Affiliation:
Department of Plant Pathology, Physiology, and Weed Science, Virginia Polytechnic Institute and State University, 435 Old Glade Road, Box 0330, Blacksburg, VA 24060-0330
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies have shown that rimsulfuron can move laterally with mower tires and injure neighboring cool-season grasses, indicating that persistent chemical can dislodge from turfgrass foliage. Laboratory studies were conducted to evaluate persistence and stability of 14C rimsulfuron on perennial ryegrass and annual bluegrass foliage. Rimsulfuron was absorbed by annual bluegrass and perennial ryegrass equivalently, and persisted equally on foliage of each species. When extracted with a water rinse, 57% of applied rimsulfuron was recovered after 10 min, and 42% of applied rimsulfuron was recovered after 96 h. Rimsulfuron was stable 4 d after application based on comparison of rinse water chromatograms to stock solution chromatograms. These data indicate that appreciable rimsulfuron persists on turf foliage for 4 d. Thus, limiting traffic on treated areas for several hours to allow drying is not a viable method to prevent lateral relocation of rimsulfuron, and subsequent injury to cool-season turfgrasses.

Keywords

Rimsulfuronannual bluegrass, Poa annua L. # POAANperennial ryegrass, Lolium perenne L. ‘Pennant II’Absorptionherbicide degradationherbicide relocationherbicide stabilitysulfonylureaHAT, hours after treatmentLSS, liquid scintillation spectrometryTLC, thin-layer chromatography
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 2 , June 2006 , pp. 345 - 350
Copyright
Copyright © Weed Science Society of America 

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