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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. |
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| Author Affiliation: | Department of Agronomy, The University of Georgia, Georgia Station, Griffin, GA |
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| Title: | Khakiweed (Alternanthera pungens ) control in bermudagrass |
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| Meeting Info.: | Little Rock, AR; January 21-22, 1992 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 45, January 1992, p. 129. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Alternanthera pungens; Herbicides; Cynodon; Sulfometuron
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| Abstract/Contents: | "Khakiweed is a prostrate summer annual that often perennates from a thick taproot. Native to South America, this species has been found in turfgrasses and forage grasses on sandy soils in Florida, Alabama, Georgia, east Texas and California. Khakiweed has villous stems and opposite orbicular to oval glabrate leaves. Flowers are white and arranged in stiff-bracted axillary heads. Experiments were conducted from 1989 to 1991 at the Southwest Experiment Station in Plains, Georgia to evaluate the efficacy of selected herbicides for khakiweed control in a common bermudagrass turf. Common bermudagrass was maintained at a mowing height of 5.0 cm and no fertilizer or irrigation water was applied to the site. Sprayable herbicide formulations were applied in a spray volume of 234 L/ha. Granular formulations were uniformly applied by hand to the plot area. Plot size was 1.5 by 3.0 or 7.6 m. Herbicides were arranged in a randomized complete block design with three replications. Visual estimates of khakiweed control and bermudagrass injury were recorded at various time intervals on a scale of 0 to 100, where 0 = no control or injury and 100 = complete control or death of bermudagrass. Khakiweed density was also recorded on a scale of 0 to 100, where 0 = no khakiweed and 100 = complete soil coverage. Early March preemergence applications of atrazine, isoxaben, pendimethalin and oxadiazon at standard turfgrass use rates did not reduce khakiweed density below that of the untreated check plot. Postemergence herbicides that did not effectively control khakiweed were imazaquin at 0.27 and 0.54 kg/ha, atrazine at 1.12 and 2.24 kg/ha, metribuzin at 0.28 and 0.56 kg/ha, dicamba at 0.28 and 0.56 kg/ha, 2, 4-D at 0.56 and 1.12 kg/ha, 2, 4-D + MCPP + dicamba at 0.9 + 0.5 + 0.1 and 1.0 + 0.6 + 0.12 kg/ha, and MCPP + 2, 4-D + dicamba at 0.4 + 0.2 + 0.04 and 0.8 + 0.4 + 0.08 kg/ha. Metsulfuron and sulfometuron at 21, 42 and 84 g/ha were applied to established khakiweed in late August of 1990 and 1991. A nonionic surfactant at 0.25% v/v was included with each herbicide. Metsulfuron did not injure common bermudagrass in either year. In 1990, sulfometuron injury 6 WAT (weeks after treatment) ranged from 12 to 27%. In 1991, sulfometuron injury ranged from 7 to 22% 2 WAT; however, no injury was apparent at 4 and 6 WAT. All rates of metsulfuron provided > 90% khakiweed control. Sulfometuron was slightly less effective than metsulfuron in controlling khakiweed. Sulfometuron at 21 and 84 g/ha gave 82 and 89%, respectively, control; however, control was only 67% at 42 g/ha. Both metsulfuron and sulfometuron significantly reduced khakiweed density below that of the untreated plots. In a separate experiment, metsulfuron at rates as low as 4.2 g/ha provided greater than or equal to 95% control of khakiweed." |
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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. 1992. Khakiweed (Alternanthera pungens ) control in bermudagrass. South. Weed Sci. Soc. Proc. 45:p. 129. |
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