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1 January 2010 Timing of Oxadiazon and Quinclorac Application on Newly Sprigged Turfgrass Species
Barry J. Brecke, Daniel O. Stephenson, J. Bryan Unruh
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Tolerance of sprigged ‘Tifsport’ and ‘Tifdwarf’ bermudagrass, ‘Meyer’ zoysiagrass, and ‘Salam’ seashore paspalum to oxadiazon (2,240 g/ha) or quinclorac (840 g/ha) applied 1 wk before sprigging (WBS), at sprigging (AS), 2 wk after sprigging (WAS), and 4 WAS was investigated in the field. Weed control was also evaluated. For both herbicides only the AS application timing injured the turfgrass greater than 22%, and injury for the other application timings ranged from 9 to 19% 5 WAS. When evaluated 8 WAS turfgrass injury following the AS application timing remained at 19%, and injury for all other timings was 8% or less. Eight WAS the 1 WBS, AS, 2 WAS, and 4 WAS application timings achieved 89, 79, 94, and 99% plot coverage, respectively, when averaged over all turfgrass species/cultivars and herbicides. By 13 WAS, all species/cultivars achieved at least 90% plot coverage. Presprigging applications of oxadiazon provided 98 to 100% goosegrass and old world diamond-flower control. Quinclorac applied AS provided greater than 70% control of these weeds. Results indicate that oxadiazon and quinclorac applied AS will cause unacceptable turfgrass injury. If goosegrass and/or old world diamond-flower are problematic, oxadiazon is a feasible choice for control of these weeds, but quinclorac is not.

Nomenclature: Oxadiazon; quinclorac; goosegrass, Eleusine indica (L.) Gaertn.; old world diamond-flower, Oldenlandia corymbosa L.; bermudagrass, Cynodon dactylon (L.) Pers. × Cynodon transvaalensis Burtt-Davey ‘Tifsport’, ‘Tifdwarf’ CYNDA; zoysiagrass, Zoysia japonica L. ‘Meyer’ ZOYJA; seashore paspalum, Paspalum viginatum Swartz, ‘Salam’ PASVA

Barry J. Brecke, Daniel O. Stephenson, and J. Bryan Unruh "Timing of Oxadiazon and Quinclorac Application on Newly Sprigged Turfgrass Species," Weed Technology 24(1), 28-32, (1 January 2010).
Received: 22 April 2008; Accepted: 1 October 2009; Published: 1 January 2010

Turfgrass tolerance
weed control
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