Full TGIF Record # 80680
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Publication Type:
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Content Type:Abstract or Summary only
Author(s):Weinbrecht, J. S.; Miller, G. L.; McCarty, L. B.
Author Affiliation:University of Florida, Gainesville, FL; Clemson University, SC
Title:Tropical signalgrass (Urochloa subquadripara) morphological growth responses following multiple postemergence herbicide applications
Section:Section II: Weed management in turf, pasture, and rangeland
Other records with the "Section II: Weed management in turf, pasture, and rangeland" Section
Meeting Info.:54th Annual Meeting, Biloxi, Mississippi: January 22-24, 2001
Source:Southern Weed Science Society Proceedings. Vol. 54, 2001, p. 72-73.
Publishing Information:Champaign, IL: Southern Weed Science Society.
# of Pages:2
Keywords:TIC Keywords: Morphology; Growth; Postemergence herbicides; Perennial weeds; Weed control; MSMA; Asulam; Imazaquin; Simazine; Ethofumesate; Quinclorac; Metribuzin; Stolons; Dry weight; Seedheads; Herbicide combinations
Trade Names:Asulox; Image; Princep; Prograss; Drive; Sencor; Illoxan
Abstract/Contents:"Tropical signalgrass is a perennial grassy weed by means of a rapidly sprawling stoloniferous growth habit. Abundant seedhead during the fall further ensures its survival by contributing significantly to its seed bank. Even if on a limited basis, the lignified senescent leaf tissue of tropical signalgrass may also serve as a survival mechanism in the form of a barrier, not only to environmental stresses, but to the uptake and translocation of postemergence herbicide applications. These features, and their relative responses to a variety of conventional postemergence herbicide applications, and various tank-mix combinations, were the focus of greenhouse pot screen trials conducted in 1999 and 2000. The objective was to identify effective treatments that merit further evaluations in subsequent field trials. A four replicate set of twelve treatments in a RCB included: MSMA (1.2 qt/A); Asulox® (5.0 pt/A); MSMA + Image® (1.2 + 1.3 qt/A); Princep® (2.0 qt/A); Princep® + Prograss® (2.0 + 4.0 qt/A); Drive® (1.0 lb/A); MSMA + Drive® (1.2 qt/A + 1.0 lb/A); Sencor® (0.3 lb/A); MSMA + Sencor® (0.1.2 qt/A + 0.16 lb/A); Illoxan® + Sencor® (1.4 qt/A + 0.16 lb/A); Illoxan® + Drive® (1.4 + 1.0 lb/A), as well as an untreated control (UTC). All treatments were applied three times at two-week intervals, with the exception of Asulox®, which was applied only twice. Surfactant requirements were addressed per label recommendations. All treatments were applied using a Devries CO2 track sprayer calibrated to deliver 20 GPA at 3 MPH and 32 PSI. Parameters reported at twelve weeks after initial treatment (WAIT) included area of stoloniferous spread (in2), above-ground (stoloniferous, senescent leaf, and green leaf) and below-ground (root) oven-dried tissue, as well as seedhead numbers per plot. Efficacy, based on reductions in parameters observed relative to the UTC, were considered fair (70-79%), good (80-89%), or excellent (90-100%). Over both years, Illoxan® + Sencor® as well as Illoxan® + Drive® were consistently similar to the UTC in terms of stoloniferous, senescent leaf, green leaf, and root tissue dry weights. Likewise, Princep® and Sencor® were similar to the UTC in terms of stoloniferous spread and senescent leaf dry weights, while Princep® and Drive® were similar to the UTC in terms of senescent leaf dry weights and seedhead numbers. As a result, these treatments were considered ineffective in consistently controlling one or more of the significant features associated with tropical signalgrass survival, and as evaluated here, did not merit further evaluation in field trials. Consistent responses over both years at 12 WAIT demonstrated that fair to good green leaf tissue reductions followed any treatment containing MSMA (≅73%) or Asulox® (≅80%). Furthermore, any treatment containing MSMA or Asulox® provided ≥98% seedhead reduction. Only MSMA applied alone and Asulox provided fair or better (≅72% and ≅83%, respectively) stoloniferous spread reductions. However, no treatment provided better than a 57% or 36% reduction in stoloniferous or root dry weights, respectively. Compared to MSMA and Asulox®, no other treatment or tank-mix combination effective in controlling other difficult perennial weeds, provided evidence of enhanced tropical signalgrass control. Yet despite reductions in green leaf dry weights, seedhead number, and stoloniferous spread, stoloniferous and root dry weights (critical features in perennial survival) were not effectively controlled. As a result, further field evaluations may incorporate MSMA or Asulox®, realizing it to be only a component to an overall control strategy. Along those same lines, although Princep® + Prograss® did not consistently provide reductions in stoloniferous, senescent leaf, green leaf, or root tissue dry weights, it did provide reductions in stoloniferous spread (≅67%) and seedhead numbers (≅97%). And based on its existing tolerance in St. Augustinegrass sod production, while effectively controlling common bermudagrass (Cynodon dactylon), it may also serve as a component to an overall control strategy. Further screening research will evaluate experimental compounds for their effectiveness in tropical signalgrass control, as well as warm-season turf tolerance."
Language:English
References:0
See Also:Other items relating to: M S M A
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Weinbrecht, J. S., G. L. Miller, and L. B. McCarty. 2001. Tropical signalgrass (Urochloa subquadripara) morphological growth responses following multiple postemergence herbicide applications. South. Weed Sci. Soc. Proc. 54:p. 72-73.
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MSU catalog number: SB 611 .S6 v.54
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