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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Porter, W. C. |
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| Author Affiliation: | Louisiana State University Agricultural Center, Louisiana Agricultural Experiment Station, Department of Horticulture, Baton Rouge, LA 70803 |
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| Title: | Response of warm-season turfgrass to CGA-136872 |
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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. 66-67. |
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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: Experimental products; Cyperus rotundus; Kyllinga brevifolia; Warm season turfgrasses; Herbicide injury; Cynodon dactylon; Cynodon transvaalensis; Axonopus affinis; Eremochloa ophiuroides; Stenotaphrum secundatum; Color; Application rates; Halosulfuron; Murdannia nudiflora; Diodia virginiana; Cultivar susceptibility
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| Abstract/Contents: | "CGA-136872 is a sulfonylurea herbicide that is being evaluated for control of purple nutsedge, green kyllinga, and phytotoxic effects in warm-season turfgrass species. Studies were conducted on bermudagrass, carpetgrass, centipedegrass, bermudagrass, and St. Augustinegrass. Color ratings were visual and/or taken with a Minolta Chroma meter. Bermudagrass, 'Tifway 419' plots were treated with CGA 136872 at 0, 10 fb 10, or 20 g/A or halosulfuron. Color was reduced by the 10g fb 10g combination of CGA 136872 after the second application (6 weeks after the initial treatment). This discoloration had almost disappeared by nine WAT. Purple nutsedge control was poor for CGA 136872 applied at 10 fb 10 g/A and 20 g/A in this study. Only halosulfuron provided any control and that was at 9 WAT. Green kyllinga control was good for all treatments at three and six WAT. At nine WAT some of the green kyllinga had resprouted from rhizomes or possibly emerged from seeds. Bermudagrass and carpetgrass plots were treated with CGA 136872 at 0, 10, 20, or 40 g/A. Halosulfuron was included as a standard check. At three WAT (weeks after treatment) bermudagrass plots treated with CGA 136872 at 20 or 40 g/A exhibited poorer visual color than the other plots. This color difference had disappeared by five WAT. No differences were detected in Chroma meter color values for any evaluation date or either turfgrass species. CGA 136872 provided unacceptable control of green kyllinga, doveweed, or Virginia buttonweed. Any suppression of Virginia buttonweed growth had disappeared by seven WAT. CCGA 136872 suppressed the growth of the bermudagrass for about four WAT. Carpetgrass growth was not influenced. Ten cultivars of St. Augustinegrass were evaluated for their response to CGA 136872. Treatments consisted of CGA 126872 at 10 fb10 g/A, 20 g/A, 40 g/A, and an untreated check. The turfgrass samples were grown in 3.75 inch square pots in a 80:20 sand:peat medium that had been amended with 2.4 lb/cu.yd. of dolomitic lime and 5 lb/cu.yd. of Nutricote 17-7-12 + minor elements fertilizer. The turfgrass was grown in the pots for one month prior to treatment. Initial treatment was on July 31, 1997 and the second application two weeks later. Each treatment was replicated three times with three pots/rep. Minolta Chroma meter color readings and injury ratings were made at four and seven weeks after the initial treatment. Top fresh weight and turf height were taken at the last evaluation. At four WAT, CGA 136872 treatments caused the St. Augustinegrass to be lighter in color (higher L values). There were treatment X cultivar interactions for the L and h° values. Lighter color was observed in all cultivars except 'Floratam' at 10 g fb 10 g/A. At 20 g/A, 'Bitterblue', 'Jade', and 'Sunclipse' were not affected. At 40 g/A all cultivars were lighter in color. The h° value (hue) was lower (increased yellowness) for 'Mercedes' at all rates of CGA 136872. 'Jade' and 'Raleigh" had lower h° values at 10g fb 10 g/A and 40 g/A. There were difference among the St. Augustinegrass cultivars for all color values. Color ratings at the last evaluation showed that 'Mercedes' at all rates and 'Jade', treated at 40 g/A, was still exhibiting more yellow color (lower h° values) than the other cultivars. Most of the cultivars had lower L values for plots treated with CGA 136872. 'Jade', 'Mercedes', and 'Raleigh' exhibited the most injury at the first evaluation. By the second evaluation all the cultivars had recovered from the initial injury except for 'Jade' treated with the 10g fb 10 g/A and 40 g/A rates. CGA 136872 also decreased the fresh weight and height of all the St. Augustinegrass cultivars. 'Bittervlue' showed greatest reduction in both paramenters at the split-rate and the 40 g/A rate 'Floralawn', 'Floratam', and 'Seville' were not affected by the 20 g/A or 40 g/A treatments. At the rates evaluated, CGA 136872 did not provide consistent control of purple nutsedge or green kyllinga. Injury to the turfgrass varied from none on centipedegrass and carpetgrass, to low on bermudagrass, and to severe on certain cultivars of St. Augustinegrass. Future studies should concentrate on using higher rates only on the tolerant species." |
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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):
Porter, W. C. 1998. Response of warm-season turfgrass to CGA-136872. South. Weed Sci. Soc. Proc. 51:p. 66-67. |
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MSU catalog number: SB 611 .S6 v.51 |
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