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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1998_vol52.pdf#page=46
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): | Derr, Jeffrey F. |
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| Author Affiliation: | Associate Professor, Hampton Roads Ag. Res. and Ext. Center, Virginia Polytech. Inst. and State Univ., Virginia Beach, VA 23455. |
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| Title: | Fenoxaprop-resistant smooth crabgrass discovered at a golf course tee |
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| Section: | Turfgrass and plant growth regulators Tuesday-January 6, 1998
Other records with the "Turfgrass and plant growth regulators Tuesday-January 6, 1998" Section
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| Meeting Info.: | Washington, DC: January 5-8, 1998 |
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| Source: | Proceedings of the 52nd Annual Meeting of the Northeastern Weed Science Society. Vol. 52, 1998, p. 46. |
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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 ischaemum; Fenoxaprop-ethyl; Herbicide evaluation; Herbicide resistance; Weed control
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| Geographic Terms: | New Jersey |
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| Abstract/Contents: | "Seed was collected from smooth crabgrass [Digitaria ischaemum (Schreb.) Muhl] plants thought to be resistant to fenoxaprop. These plants were growing at a golf course tee in the southern part of New Jersey, where fenoxaprop was the primary herbicide used for crabgrass control in the tees. For comparison, seed of smooth crabgrass plants was collected from plants growing in the rough, where fenoxaprop had not been used. Seed of these two smooth crabgrass selections and seed of large crabgrass [Digitaria sanguinalis (L.) Scop.] were used to produce plants for greenhouse studies. Plants were transplanted to containers and were treated treated when they were tillering. The 0.57 lb/gallon formulation of fenoxaprop was used in all studies. In the first study, fenoxaprop was applied at 0.06, 0.12, and 0.25 lb ai/A. Shoot fresh weight was recorded 18 days after treatment (DAT). Fenoxaprop at 0.06 lb/A reduced shoot weight of large crabgrass by 91% and smooth crabgrass collected from the rough by 80%. Fenoxaprop at 0.25 lb/A reduced shoot weight of large crabgrass by 95% and smooth crabgrass collected from the rough by 91%. Fenoxaprop at 0.25 lb/A did not cause a significant reduction in shoot weight of smooth crabgrass plants from the tee. Smooth crabgrass therefore had developed resistance in the tee, but resistance was not present in areas of the golf course which had not been treated with fenoxaprop. A second study evaluated the extent of tolerance in the resistant smooth crabgrass. Fenoxaprop was applied at 0.17, 0.34, 0.68, and 1.36 lb/A. Injury was observed in plants treated at the three highest rates. Shoot fresh weight was recorded 6 weeks after treatment. As the fenoxaprop rate increased, shoot fresh weight decreased. No reduction was observed at 0.17 lb/A, while 93% reduction was observed at 1.36 lb/A, with about 60% reduction seen at 0.68 lb/A. The resistance therefore is not unlimited since these plants can tolerate rates up to 0.25 lb/A but are adversely affected by higher rates. To determine sensitivity to other postemergence crabgrass herbicides, a third study was established. Fenoxaprop was applied at 0.085 and 0.17 lb/A, MSMA was applied at 2.0 and 4.0 lb/A, dithiopyr was applied at 0.25 and 0.5 lb/A, and quinclorac was applied at 0.5 and 1.0 lb/A to large crabgrass and the two selections of smooth crabgrass. Fenoxaprop at both rates gave essentially complete control of large crabgrass and smooth crabgrass from the rough, with no injury seen in the resistant smooth crabgrass. At the higher rate tested, both MSMA and dithiopyr gave over 90% reduction in shoot weight of the resistant smooth crabgrass. The higher rate of quinclorac reduced shoot weight of the resistant smooth crabgrass by approximately 40%." |
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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):
Derr, J. F. 1998. Fenoxaprop-resistant smooth crabgrass discovered at a golf course tee. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 52:p. 46. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1998_vol52.pdf#page=46
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. 52 |
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