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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Murphy, T. R.;
Smith, A. E. |
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| Author Affiliation: | Crop and Soil Sciences Department, The University of Georgia, Griffin, GA 30223-1797. |
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| Title: | Control of suspected Dinitroaniline-resistant goosegrass (Eleusine indica) in bermudagrass |
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| Meeting Info.: | Dallas, TX: January 17-19, 1994 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 47, 1994, p. 73-74. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Weed resistance to herbicides; Cynodon dactylon; Eleusine indica; Dinitroaniline herbicides; Herbicide application; Encroachment; Weed control; Chemical control; Oxadiazon; Pendimethalin; Prodiamine; Oryzalin; Dithiopyr
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| Abstract/Contents: | "Effective, economical annual grass control has led to the widespread use of dinitroaniline herbicides by turfgrass managers. In 1992, a golf course superintendent in middle Georgia reported that goosegrass populations were increasing on fairways that had a history of annual applications of various dinitroaniline herbicides. In 1993, experiments were conducted to investigate the possibility of the presence of dinitroaniline-resistant goosegrass on this golf course. Both field and laboratory experiments were conducted. The field experiment was conducted on a common bermudagrass fairway that was maintained at a 1.25 cm clipping height. Oxadiazon at 2.2 and 4.5, prodiamine at 4.0 and 0.8, pendimethalin at 1.7 and 3.4, oryzalin at 1.7 and 3.4 and dithiopyr at 0.3 and 0.6 kg/ha were applied to separate plots either as a single or repeat application. The single application was made on February 17 and the repeat application on April 16. Goosegrass control and coverage ratings were recorded periodically throughout the year. In August, 1993, goosegrass plants were collected from plots previously treated with a dinitroaniline herbicide and dithiopyr, as well as the no herbicide check plot. Additionally, goosegrass plants were collected from a golf course in North Carolina from turfgrass areas that had a history of dinitroaniline herbicide treatment, and from an area with no history of dinitroaniline herbicide use. Goosegrass plants were fractionated into into individual tillers and roots were trimmed to the base of the tiller. Single tillers were suspended in a styrofoam block and floated on a 0.5 strength Hoaglands solution that contained either 10 -6M trifluralin, oryzalin or dithiopyr. A no herbicide check was included. Tillers were placed in a growth chamber maintained at a 14 h day temperature of 29.5 C and a 10 h night temperature of 21.0 C. Nutrient/herbicide solutions were changed weekly. At 21 days of treatment, tillers were harvested and fresh root weights determined. Regardless of the rate, single and repeated applications of pendimethalin, oryzalin, and prodiamine did not control goosegrass either as a single or repeat application. Oxadiazon at all rates and application sequences provided >=90% goosegrass control. The tiller bioassay proved to be a reliable method of detecting goosegrass resistance to dithiopyr and dinitroaniline herbicides. Root growth was extensive for goosegrass plants collected from plots previously treated with pendimethalin, oryzalin, prodiamine and dithiopyr in the presence of a dinitroaniline herbicide and dithiopyr. However, there was essentially no root growth from goosegrass plants collected from turfgrass areas with no history of dinitroaniline herbicide use. To our knowledge, this is the first report of cross resistance to dinitroaniline herbicides and dithiopyr." |
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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):
Murphy, T. R., and A. E. Smith. 1994. Control of suspected Dinitroaniline-resistant goosegrass (Eleusine indica) in bermudagrass. South. Weed Sci. Soc. Proc. 47:p. 73-74. |
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