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Bispyribac-sodium Metabolism in Annual Bluegrass, Creeping Bentgrass, and Perennial Ryegrass

Published online by Cambridge University Press:  20 January 2017

Patrick E. McCullough ,
Stephen E. Hart ,
Thomas J. Gianfagna  and
Fabio C. Chaves
Patrick E. McCullough*
Affiliation:
Department of Crop and Soil Sciences, University of Georgia, Griffin, GA 30223–1797
Stephen E. Hart
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901–8520
Thomas J. Gianfagna
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901–8520
Fabio C. Chaves
Affiliation:
Department of Plant Biology and Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901–8520
*
Corresponding author's E-mail: pmccull@uga.edu
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Abstract

Bispyribac-sodium selectively controls annual bluegrass in creeping bentgrass and perennial ryegrass, which might be attributed to differential metabolism among species. To test this hypothesis, we investigated metabolism of 14C-bispyribac-sodium in annual bluegrass, creeping bentgrass, and perennial ryegrass. Creeping bentgrass and perennial ryegrass metabolized approximately 50% of the 14C-bispyribac-sodium after 1 d, while annual bluegrass metabolized less than 20%. Parent herbicide recovered 7 d after treatment in annual bluegrass, creeping bentgrass, and perennial ryegrass was 73, 32, and 39% of total radioactivity per species, respectively. Polar metabolites recovered after 7 d in annual bluegrass, creeping bentgrass, and perennial ryegrass were 24, 59, and 55% of total radioactivity per species, respectively. Half-life of 14C-bispyribac-sodium in annual bluegrass, creeping bentgrass, and perennial ryegrass was estimated at greater than 7 d, 1 d, and 2 d, respectively. Results support the hypothesis that differential tolerances of these grasses are attributed to herbicide metabolism.

Keywords

Bispyribac-sodiumannual bluegrass, Poa annua L.creeping bentgrass, Agrostis stolonifera L., ‘L-93’perennial ryegrass, Lolium perenne L., ‘Manhattan 4’.Efficacyturfgrass
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 57 , Issue 5 , October 2009 , pp. 470 - 473
Copyright
Copyright © Weed Science Society of America 

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