TY - JOUR
T1 - Bispyribac-sodium Metabolism in Annual Bluegrass, Creeping Bentgrass, and Perennial Ryegrass
AU - McCullough, Patrick E.
AU - Hart, Stephen E.
AU - Gianfagna, Thomas J.
AU - Chaves, Fabio C.
PY - 2009/9
Y1 - 2009/9
N2 - 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. Nomenclature: Bispyribac-sodium; annual bluegrass, Poa annua L.; creeping bentgrass, Agrostis stolonifera L., 'L-93'; perennial ryegrass, Lolium perenne L., 'Manhattan 4'.
AB - 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. Nomenclature: Bispyribac-sodium; annual bluegrass, Poa annua L.; creeping bentgrass, Agrostis stolonifera L., 'L-93'; perennial ryegrass, Lolium perenne L., 'Manhattan 4'.
KW - Efficacy
KW - Turfgrass
UR - http://www.scopus.com/inward/record.url?scp=77749274253&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77749274253&partnerID=8YFLogxK
U2 - https://doi.org/10.1614/WS-09-025.1
DO - https://doi.org/10.1614/WS-09-025.1
M3 - Article
SN - 0043-1745
VL - 57
SP - 470
EP - 473
JO - Weed Science
JF - Weed Science
IS - 5
ER -