Timing of oxadiazon and quinclorac application on newly sprigged turfgrass species

Document Type

Article

Publication Date

1-1-2010

Abstract

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.

Publication Source (Journal or Book title)

Weed Technology

First Page

28

Last Page

32

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