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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=86
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Mittlesteadt, T. L.;
Askew, S. D. |
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| Author Affiliation: | Virginia Tech, Blacksburg, VA |
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| Title: | Critical period of overseeded perennial ryegrass competition with bermudagrass |
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| Section: | Weed management in turf
Other records with the "Weed management in turf" Section
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| Meeting Info.: | Jacksonville, Florida: January 27-30, 2008 |
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| Source: | 2008 Proceedings, Southern Weed Science Society. Vol. 61, 2008, p. 126. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Aesthetic values; Competition; Cynodon dactylon; Lolium perenne; Overseeding
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| Abstract/Contents: | "In the transition zone, a common practice is to overseed warm season bermudagrass (Cynodon dactylon) with cool season perennial ryegrass (Lolium perenne) to improve winter aesthetics on golf courses. Most golf revenue is generated during spring and early summer due to ideal weather conditions. Perennial ryegrass is needed to provide desirable quality and playing conditions for fairway turf, but competitively injures bermudagrass during this period. Bermudagrass has the ability to recover from perennial ryegrass competition given enough time during the summer. It has been suggested that healthy bermudagrass needs 100 days of weed-free growth in summer, yet research has not been conducted to validate or test this claim. "Healthy" bermudagrass is a subjective term that is usually based on biomass accumulation, total nonstructural carbohydrate (TNC), and ability of plants to survive stresses such as cold, heat, or UV light. Our objective is to measure how duration of perennial ryegrass competition influences bermudagrass cover, biomass accumulation and resistance to stress. Studies were conducted in Blacksburg, VA on Patriot bermudagrass at Virginia Tech's Glade Road Research Facility and on Midiron bermudagrass at the Turfgrass Research Center in 2006. In 2007 the study was repeated on Riviera bermudagrass at Virginia Tech's golf course in Blacksburg, VA. Foramsulfuron (Revolver) at 1.24 L/ha, was applied at weekly intervals for 24 weeks between April 4 and September 12, 2006 and between April 6 and September 14, 2007. To evaluate how the duration of perennial ryegrass competition influences bermudagrass cover, visual bermudagrass cover ratings and biomass accumulation measurements were recorded. To determine if perennial ryegrass competition influences the ability of bermudagrass to resist stress, TNC and electrolyte leakage measurements were recorded in 2006 and will be collected for the 2007 study. Data were subjected to analysis of variance using a repeated measures technique and regressions were used to describe effects of bermudagrass weedfree period on measured responses. Perennial ryegrass left to compete with bermudagrass beyond July 25, 2006 (less than 68 days of competition free growth) reduced bermudagrass visual cover 10 to 20% and 13 to 35% in Patriot and Midiron bermudagrasses, respectively. Perennial ryegrass left to compete with Riviera bermudagrass after August 3, 2007 (less than 50 days of competition free growth) resulted in a 13 to 38% decrease in bermudagrass. Patriot and Riviera dry biomass increased as the number of competition-free days of growth increased, while Midiron biomass exhibited a hyperbolic response with an asymptote at approximately 100 days. This differential biomass accumulation indicates that Patriot and Riviera continues to compete with ryegrass and grow during the entire season while Midiron does not. TNC and electrolyte leakage measurements for Patriot and Midiron show no differences between treatments. Riviera TNC and electrolyte leakage measurements have not been completed to date. Based on the data from these studies, we can conclude that 100 days of non-competitive growth is a safe general estimate for bermudagrass to reach acceptable cover and reach sustained health." |
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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):
Mittlesteadt, T. L., and S. D. Askew. 2008. Critical period of overseeded perennial ryegrass competition with bermudagrass. South. Weed Sci. Soc. Proc. 61:p. 126. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2008 Proceedings-SWSS.pdf#page=86
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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