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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Lowe, D. B.;
Whitwell, T. |
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| Author Affiliation: | Department of Horticulture, Clemson University |
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| Title: | Late postemergence herbicide applications to reduce purple nutsedge tubers in bermudagrass turf. |
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| Meeting Info.: | 51st Annual Meeting, Birmingham, AL, January 26-28, 1998 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 51, 1998, p. 72-73. |
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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: Postemergence herbicides; Application timing; Cyperus rotundus; Cynodon; Weed control; Herbicide injury; Imazaquin; MSMA; Tank mix; Halosulfuron; Sulfentrazone; Tubers; Soil depth
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| Abstract/Contents: | "Purple nutsedge produces numerous tubers that allow subsequent regrowth once existing shoots are killed by herbicides. Long-term purple nutsedge control requires substantial tuber number reduction, however, no herbicides will kill existing tubers. In turfgrass, several herbicide applications are needed each year for adequate purple nutsedge shoot suppression. The objective of our study was to determine if postemergence herbicide application timing influences tuber numbers. A golf course driving range at Florence Country Club in Florence, SC was heavily infested with purple nutsedge. Treatments were applied with a COā backpack sprayer calibrated to deliver 30 gal/A and included halosulfuron (0.063 lb ai/A), imazaquin (0.38 lb ai/A) + MSMA (2.0 lb ai/A) and sulfentrazone (0.38 lb ai/A). Optima surfactant was included with each treatment at a 0.5% rate. Treatments were applied to the same plots in 1996 and 1997. Application timings were either August or October 1996. Plots were retreated with respective treatments in July, 1997 and again in either August, September or October. Purple nutsedge control and bermudagrass injury was rated visually on a 0 to 100% scale with 0% = no control or injury and 100% = total plant death. Plot size was 6.6 X 6.6 ft. Two soil cores were taken from each plot on December 11, 1997 using a golf cup cutter (12.6 in.Ā²) to a depth of 4 in. Soil was washed and tubers were counted and weighed. A randomized complete block design was used and data analyzed with means separated using an LSD of P=0.05. All treatments provided greater than 60% purple nutsedge shoot suppression by November 11, 1996; with imazaquin + MSMA (August) and halosulfuron (October) treatments providing >80%. Sulfentrazone only decreased nutsedge shoots 60 to 70% by November ratings. In 1997, the final rating was recorded on October 10 and all treatments provided greater than 60% shoot suppression. September applications of imazaquin + MSMA and halosulfuron provided >90% shoot suppression. Sufentrazone provided <70% shoot suppression in 1997. Ten soil cores were taken from untreated areas outside of study plots and cores were separated into 3 segments (0 to 2.4, 2.5, to 4.8 and 4.9 to 7.0 inch depths). Most tubers (89%) occurred at a 0 to 2.4 inch depth, 11% of tubers were found at the 2.5 to 4.8 inch depth and no tubers were found at the 4.9 to 7.0 inch depth. Tuber fresh weights at 0 to 2.4 inch depths averaged 0.1g/tuber, whereas, tuber fresh weights were greater at 2.5 to 4.8 inch depths (0.2g/tuber). All postemergence herbicides decreased tuber numbers but not tuber weights. August treatments of imazaquin + MSMA, halosulfuron and sulfentrazone reduced tuber numbers (3, 5 and 8 tubers/100inĀ³, respectively) compared to untreated plots (113 tubers/100 inĀ³). Within herbicide treatments, sulfentrazone applied in October had the most tubers (43 tubers/100inĀ³)." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: M S M A |
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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):
Lowe, D. B., and T. Whitwell. 1998. Late postemergence herbicide applications to reduce purple nutsedge tubers in bermudagrass turf.. South. Weed Sci. Soc. Proc. 51:p. 72-73. |
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MSU catalog number: SB 611 .S6 v.51 |
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