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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1999_vol53.pdf#page=105
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Zawierucha, Joseph;
Penner, Donald |
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| Author Affiliation: | Zawierucha: Technical Manager, BASF Corporation, Research Triangle Park, NC; Penner: Professor, Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI |
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| Title: | Differential response of large crabgrass and goosegrass to quinclorac |
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| Meeting Info.: | Cambridge, MA: January 4-7, 1999 |
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| Source: | Proceedings of the 53rd Annual Meeting of the Northeastern Weed Science Society. Vol. 53, 1999, p. 105. |
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| Publishing Information: | College Park, MD: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Digitaria sanguinalis; Crabgrass control; Weed control; Eleusine indica; Quinclorac; Herbicides; Herbicide evaluation; Adjuvants; Growth stages; Application rates; Absorption; Translocation; Metabolism
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| Abstract/Contents: | "Quinclorac herbicide from BASF is currently registered in the United States for use in rice (Oryza sativa L.) and is on registration tract for use in turfgrass. The spectrum of weed control with quinclorac includes annual grasses and several key broadleaf weeds. Quinclorac exhibits both preemergence and postemergence activity on susceptible weed species. Two major weedy grass species in both warm and cool season turfgrass include large crabgrass (Digitaria sanguinalis [L.] Scop.) and goosegrass (Eleusine indica [L.] Gaertn.). Previous studies have found that large crabgrass is very sensitive to quinclorac, while goosegrass has been found to be quite tolerant. Past research has also demonstrated that quinclorac requires the use of an effective adjuvant to maximize foliar activity. Several greenhouse experiments were conducted to evaluate selected commercial and experimental adjuvants for their effectiveness and selectivity in turfgrass. Large crabgrass and goosegrass were used as indicator species for efficacy. Applications were made at the 1-2 tiller stage of the weeds. GR ₅₀ values were calculated to quantify and compare the efficacy of the adjuvants. For large crabgrass, GR ₅₀ values ranged from 46 to 98 g ha ⁻¹ depending on adjuvant. For goosegrass, no adjuvant was found to provide sufficient control to allow for a GR ₅₀ calculation within a commercial use rate range. Further studies were conducted with goosegrass to evaluate the effects of growth stage and the impact of both foliar and soil uptake of quinclorac on resultant control. Quinclorac was applied @ 1,2,4,8, and 16 kg ha⁻¹ to goosegrass as a preemergence treatment, 1-2 leaf stage, 4-5 leaf stage, and 1-2 tiller stage with and without a vermiculite soil barrier. Results showed that across growth stages, the soil activity of quinclorac tended to increase control; however, commercial performance could not be achieved within the perspective labeled use rate at any growth stage. Absorption, translocation, and metabolism studies using ¹⁴ C-quinclorac were also conducted with the two grass species. For these experiments, plants were maintained in vials containing Hoagland's solution and were continually aerated. Results from the absorption studies showed that after an eighty-hour exposure time, that both species had absorbed approximately equal amounts of applied ¹⁴ C- quinclorac (27% and 22%), respectively for large crabgrass and goosegrass. The translocation results showed that 95% of the absorbed ¹⁴ C-quinclorac remained in the treated leaf for large crabgrass after 80 hr. However, only 58% of the absorbed ¹⁴ C remained in the treated leaf of goosegrass. Nutrient vials did not contain any appreciable amounts of ¹⁴ C-quinclorac that may have been exudated by either species. Results of the metabolism studies showed that neither the susceptible species (crabgrass) nor the tolerant species (goosegrass) was able to metabolize the parent quinclorac herbicide. The data indicate that target site differences may contribute to selectivity." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Zawierucha, J., and D. Penner. 1999. Differential response of large crabgrass and goosegrass to quinclorac. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 53:p. 105. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1999_vol53.pdf#page=105
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 53 |
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