Tropical signalgrass (Urochloa subquadripara) control with preemergence- and postemergence-applied herbicides

Tropical signalgrass is one of the most serious weed problems in the St. Augustinegrass sod production in Florida, and its presence increases production costs and lowers turfgrass quality. The objectives of our research were to: (1) evaluate herbicides preemergence and postemergence for control of t...

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Bibliographic Details
Published in:Weed technology 2004-04, Vol.18 (2), p.419-425
Main Authors: Teuton, T.C, Unruh, J.B, Brecke, B.J, MacDonald, G.E, Miller, G.L, Ducar, J.T
Format: Article
Language:English
Subjects:
Agricultural soils
Biological and medical sciences
Chemical control
Fertilizer application timing
Fundamental and applied biological sciences. Psychology
Germination
Herbicides
Organic farming
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
postemergent weed control
preemergent weed control
Sand
Seedlings
Soil organic matter
Turf grasses
Urochloa
Web pages
Weeds
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Summary:Tropical signalgrass is one of the most serious weed problems in the St. Augustinegrass sod production in Florida, and its presence increases production costs and lowers turfgrass quality. The objectives of our research were to: (1) evaluate herbicides preemergence and postemergence for control of tropical signalgrass and (2) compare control of tropical signalgrass and other problem weeds (torpedograss, blanket crabgrass, and India crabgrass) with postemergence herbicides. In preemergence herbicide field trials, only benefin + oryzalin, imazapic, imazapic + 2,4-D, and oryzalin provided ≥75% tropical signalgrass control 8 wk after application (WAA). By 11 WAA, only benefin + oryzalin and imazapic + 2,4-D provided ≥75% tropical signalgrass control. In greenhouse experiments, eight herbicide treatments were applied postemergence to tropical signalgrass seedlings at the two-, four-, six-, and eight-leaf stages. Asulam and CGA 362622 provided ≥89% tropical signalgrass control at all application timings. Imazaquin controlled tropical signalgrass ≥98% when applied before the eight-leaf stage. However, in field trials with mature tropical signalgrass (>20 cm stolons), none of the 20 herbicide treatments applied postemergence provided acceptable control.
ISSN:0890-037X
1550-2740
DOI:10.1614/WT-03-155R1