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Hybrid Kentucky Bluegrass Tolerance to Preemergence and Postemergence Herbicides

Published online by Cambridge University Press:  20 January 2017

Travis C. Teuton ,
Christopher L. Main ,
John C. Sorochan ,
J. Scott McElroy ,
William E. Hart ,
Carl E. Sams  and
Thomas C. Mueller
Travis C. Teuton*
Affiliation:
Division of Plant Sciences, University of Missouri–Columbia, Columbia, MO 65211
Christopher L. Main
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
John C. Sorochan
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
J. Scott McElroy
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
William E. Hart
Affiliation:
Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, TN 37996
Carl E. Sams
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
Thomas C. Mueller
Affiliation:
Department of Plant Sciences, University of Tennessee, Knoxville, TN 37996
*
Corresponding author's E-mail: [email protected]
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Abstract

Field studies were conducted near Knoxville, TN, from 2003 to 2005 to evaluate the response of ‘Thermal Blue’, a new interspecific hybrid Kentucky bluegrass to commonly applied PRE and POST herbicides for weed management. Dithiopyr, oryzalin, oxadiazon, pendimethalin, prodiamine, quinclorac, and trifluralin applied at seeding injured hybrid bluegrass greater than 81% and reduced hybrid bluegrass cover greater than 57%. In a second study, established hybrid bluegrass was treated POST with acetolactate synthase–inhibiting herbicides including bispyribac-sodium, chlorosulfuron, foramsulfuron, halosulfuron, imazapic, imazaquin, metsulfuron, rimsulfuron, sulfosulfuron, and trifloxysulfuron at low and high rates (one and two times the suggested use rates in Kentucky bluegrass or other turfgrasses). By 5 wk after treatment (WAT), foramsulfuron at 88 g ai/ha and trifloxysulfuron at 35 g ai/ha injured hybrid bluegrass greater than 26% and reduced visually estimated quality and chlorophyll meter indices. However, hybrid bluegrass injury was no longer evident at 10 WAT. In a third study, established hybrid bluegrass was treated with clethodim, diclofop-methyl, fluazifop-p-butyl, and sethoxydim applied at low, medium, and high rates (0.5, 1, and 2 times the registered Kentucky bluegrass or other turfgrass use rates). Clethodim applied at 280 and 560 g ai/ha, fluazifop at 420 g ai/ha, and sethoxydim at 630 g ai/ha injured hybrid bluegrass 5 WAT. These treatments also reduced quality (to less than 5 on a scale of 1 to 9) and chlorophyll meter indices (24 to 37%) when compared to the untreated control. By 10 WAT, only clethodim at 560 g ai/ha caused injury (14%). By 10 WAT, hybrid bluegrass had recovered and injury was only observed in plots treated with clethodim at 560 g ai/ha. No differences in chlorophyll indices or quality were observed at 10 WAT for any POST graminicides.

Keywords

Bispyribac-sodium, chlorosulfuron, clethodim, diclofop-methyl, dithiopyr, fluazifop-p-butyl, foramsulfuron, halosulfuron, imazapic, imazaquin, metsulfuron, oryzalin, oxadiazon, pendimethalin, prodiamine, quinclorac, rimsulfuron, sethoxydim, sulfosulfuron, trifloxysulfuron, trifluralin, Kentucky bluegrass, Poa arachnifera Torr. × P. pratensis L. ‘Thermal Blue’Chlorophyll indexchlorophyll meterinjuryqualityturf
Type
Weed Management — Other Crops/Areas
Information
Weed Technology , Volume 22 , Issue 2 , June 2008 , pp. 240 - 244
Copyright
Copyright © Weed Science Society of America 

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References

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