Full TGIF Record # 70172
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Publication Type:
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Report
Author(s):Sciarappa, W. J.; Evans, J. R.
Author Affiliation:BASF Corporation, Research Triangle Park, NC
Title:Timing of quinclorac application in relation to seeding of cool-season turfgrasses
Section:Supplement of the 47th annual meeting of NEWSS: Presented papers - 1992
Other records with the "Supplement of the 47th annual meeting of NEWSS: Presented papers - 1992" Section
Meeting Info.:Baltimore, MD: January 4-7, 1993
Source:Proceedings of the 47th Annual Meeting of the Northeastern Weed Science Society. Vol. 47, 1993, p. 207.
Publishing Information:Ithaca, NY: Northeastern Weed Science Society
# of Pages:1
Keywords:TIC Keywords: Application timing; Quinclorac; Seeding; Cool season turfgrasses; Establishment; Weed control; Seedlings; Herbicide resistance; Preemergence weed control; Postemergence weed control; Preemergence herbicides; Postemergence herbicides; Comparisons; Herbicide injury; Festuca arundinacea; Poa pratensis; Lolium perenne; Agrostis stolonifera
Abstract/Contents:"A major problem in establishing cool-season grasses in the spring or summer is controlling crabgrass and other annual grass species. Quinclorac may be able to provide effective crabgrass control in some of the more tolerant cool-season turfgrasses. Greenhouse trials had indicated that during turfgrass establishment, new seedings tolerated quinclorac better as a postemergence application than as a preemergence application. Field tests were conducted on a clay and a sandy loam soil to confirm these results in a multi-cultivar planting. Results were similar at both sites. Preemergence and pre-plant incorporated treatments of quinclorac were applied at .5, .75 and 1.0 lbs ai/a just prior to and just following the seeding of four turfgrass cultivars. Control of large crabgrass [Digitaria sanguinalis {L.} Scop.] and yellow foxtail [Setaria glauca {L.} Beauv.] ranged from 86 to 96% at 42 DAT. Turf injury to tall fescue and perennial ryegrass occurred in the form of some stunting and discoloration which was marginally unacceptable - 3.0 to 3.3 injury rating on a 0 to 9 scale. Kentucky bluegrass injury was similar although not quite as severe while 'Penncross' creeping bentgrass was surprisingly tolerant. Postemergence treatments were applied at 2, 4, 8 and 12 weeks after emergence. Applications at 2 weeks showed bluegrass to have noticeably higher injury ratings with severe twisting and some stand reduction occurring. The three other turf species were injured to a lesser degree which was in contrast to the greenhouse studies which showed bluegrass to be more tolerant than bentgrass. This may have been due to the additive field effect of heatstress. Applications at 4 and 8 weeks after emergence were considerably safer to all four turf cultivars although bentgrass at one site showed considerable discoloration. Control of large crabgrass and yellow foxtail was generally excellent at these timings [over 90%]. This high level of annual grass control at any application timing was the overriding factor in successfully establishing turf. Elimination of the weeds that were vigorously competing for space and nutrients allowed the turfgrasses to grow out of either minor or substantial injury."
Language:English
References:0
Note:Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Sciarappa, W. J., and J. R. Evans. 1993. Timing of quinclorac application in relation to seeding of cool-season turfgrasses. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 47:p. 207.
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