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Hybrid Bluegrass Tolerance to Postemergence Applications of Mesotrione and Quinclorac

Published online by Cambridge University Press:  20 January 2017

J. Scott McElroy ,
Greg. K. Breeden  and
John C. Sorochan
J. Scott McElroy*
Affiliation:
Department of Plant Science, University of Tennessee, 2431 Joe Johnson Dr., Knoxville, TN 37996
Greg. K. Breeden
Affiliation:
Department of Plant Science, University of Tennessee, 2431 Joe Johnson Dr., Knoxville, TN 37996
John C. Sorochan
Affiliation:
Department of Plant Science, University of Tennessee, 2431 Joe Johnson Dr., Knoxville, TN 37996
*
Corresponding author's E-mail: mcelroy@utk.edu
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Abstract

New hybrid bluegrass cultivars have been bred for increased heat and drought tolerance compared with traditional Kentucky bluegrass cultivars. Research was conducted to evaluate hybrid bluegrass tolerance and smooth crabgrass and goosegrass control with mesotrione and quinclorac during seeded establishment. Mesotrione applied as a single application 14, 28, or 42 d after emergence (DAE) injured hybrid bluegrass acceptably from 1 to 11% 7 d after treatment (DAT). A sequential mesotrione application at 0.14 kg/ha 28 DAE did not injure hybrid bluegrass greater than the initial 14 DAE application; however, a sequential application at 0.28 kg/ha 28 DAE injured hybrid bluegrass greater than the initial 14 DAE application. Three sequential mesotrione applications did not reduce hybrid bluegrass ground cover 63 DAE. Quinclorac applied singly at 1.68 kg/ha 14 DAE and sequentially at 0.84 kg/ha 14 and 28 DAE injured hybrid bluegrass that continued throughout the rating period resulting in decreased ground cover at 63 DAE. Quinclorac at 0.84 kg/ha plus mesotrione at 0.28 kg/ha injured hybrid bluegrass < 20% throughout the rating period but reduced ground cover 63 DAE. All quinclorac-containing treatments controlled smooth crabgrass ≥ 92%. All mesotrione sequential-application treatments controlled smooth crabgrass and goosegrass ≥ 87%. These data indicate that sequential mesotrione applications can be used for smooth crabgrass and goosegrass control during seeded hybrid bluegrass establishment. Quinclorac should be applied according to label recommendations at 0.84 kg/ha no earlier than 28 DAE.

Keywords

MesotrionequincloracgoosegrassEleusine indica (L.) Gaertn. ELEINsmooth crabgrass, Digitaria ischaemum (Schreb.) Schreb. ex Muhl. DIGIShybrid bluegrass, Poa pratensis L. × Poa arachnifera Torr. ‘Solar Green’, ‘Durablue’, and ‘Thermal Blue’, Kentucky bluegrass, Poa pratensis L. POAPRSeeded establishmentturfgrass injury
Type
Research
Information
Weed Technology , Volume 21 , Issue 3 , September 2007 , pp. 807 - 811
Copyright
Copyright © Weed Science Society of America 

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