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| Web URL(s): | http://www.bioone.org/bioone/?request=get-document&issn=0890-037X&volume=014&issue=04&page=0675
Last checked: 11/2005
Access conditions: Item is within a limited access website |
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| Publication Type:
| Refereed |
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| Author(s): | Johnson, B. Jack;
Duncan, Ronny R. |
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| Author Affiliation: | Johnson: Professor Emeritus; and Duncan: Professor, Crop and Soil Sciences, University of Georgia, Griffin, GA |
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| Title: | Timing and frequency of ethofumesate plus flurprimidol treatments on bermudagrass (Cynodon spp.) suppression in seashore paspalum (Paspalum vaginatum) |
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| Section: | Research
Other records with the "Research" Section
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| Source: | Weed Technology. Vol. 14, No. 4, October-December 2000, p. 675-685. |
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| Publishing Information: | Champaign, IL: Weed Science Society of America. |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Application timing; Application frequency; Ethofumesate; Combination treatments; Flurprimidol; Tank mix; Weed control; Paspalum vaginatum; Cynodon; Encroachment; Application rates; Herbicide resistance; Herbicide evaluation; Herbicide injury; Cynodon dactylon; Cynodon transvaalensis; Growth; Cultivar evaluation
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| Cultivar Names: | Tifway; TifEagle; Sea Isle I; Sea Isle 2000; K-3 |
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| Abstract/Contents: | "Suppression of grass encroachment of one warm-season grass into another species is an important management tool. Two field studies were conducted in Georgia to determine the timing, rates, and frequency of ethofumesate plus flurprimidol applications needed to suppress three bermudagrass cultivars and determine what effects these treatments have on tolerance of three seashore paspalum cultivars during 1998 and 1999. Tank-mixes of ethofumesate and flurprimidol applied at the 1X rate (1.7 + 0.8 kg/ha) on April 1 suppressed 'TifEagle' bermudagrass effectively (≥78%) by late September. However, the suppression of 'Tifway' bermudagrass (≤39%) and 'common' bermudagrass (≤67%) was not acceptable at the same rates and timing. Ethofumesate plus flurprimidol applied at the 1X rate in April severely infured all paspalum cultivars 61 to 65% within a 2 to 6-wk period, but the cultivars recovered to an acceptable level (≤30%) by 10 wk. In most instances, reduced ethofumesate plus flurprimidol rates (¼X and ½X) following the 1X rate in April did not injure the paspalum cultivars as severely as did the initial 1X rate. However, bermudagrass suppression was improved from the multiple treatments. When the chemicals were applied initially at the 1X rate and followed by four timely ¼X rates, bermudagrass suppression by late September was ≥72% for all bermudagrass cultivars, with the exception of common bermudagrass in 1998 (52%). Maximum injury to the paspalum cultivars during 1998 and 1999 from the four repeated ^D#14X rates ranged from 16 to 45% for 'Sea Isle 1', to 33 to 37% for 'Sea Isle 2000', and 21 to 52% for 'K-3'. Ethofumesate plus flurprimidol applied initially at the 1X or 2X rate on June 30 and followed by a repeated application on July 25 did not effectively suppress (≤70%) common bermudagrass either year or Tifway bermudagrass in 1999. However, the suppression of common bermudagrass (≥83%) and Tifway bermudagrass (^D>90%) was effective when the chemicals were applied initially at the 2X rate on June 30, followed by a 2X rate on July 25 and a 1 X treatment on August 14. TifEagle bermudagrass was effectively suppressed (≥85%) when applied initially on June 30 and July 25 at the 1X rate. Ethofumesate plus flurprimidol applied once at the 1X rate on June 30 caused ^D<46% injury to paspalum cultivars. The injury was generally ^D#50% when the chemicals were applied in two or more applications. |
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| Language: | English |
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| References: | 14 |
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| See Also: | Other items relating to: Seashore Paspalum - Since 2000 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Johnson, B. J., and R. R. Duncan. 2000. Timing and frequency of ethofumesate plus flurprimidol treatments on bermudagrass (Cynodon spp.) suppression in seashore paspalum (Paspalum vaginatum). Weed Technol. 14(4):p. 675-685. |
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| Web URL(s):
http://www.bioone.org/bioone/?request=get-document&issn=0890-037X&volume=014&issue=04&page=0675
Last checked: 11/2005
Access conditions: Item is within a limited access website |
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MSU catalog number: SB 610 .W44 |
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