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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | McCarty, L. B.;
Weinbrecht, J. S. |
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| Author Affiliation: | Univ. of Florida, Gainesville, FL 32611-0670 |
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| Title: | Trinexapac-ethyl (PRIMOĀ®) as an overseeding and transition establishment aid |
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| Section: | Papers and Abstracts Presented
Other records with the "Papers and Abstracts Presented" Section
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| Meeting Info.: | 49th Annual Meeting, Charlotte, NC, January 15-17, 1996 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 49, 1996, p. 72. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Plant growth retardants (PGRs) have traditionally been used in the turfgrass market for low maintenance situations such as roadsides. However, in recent years introduction of new chemistry has successfully allowed the transition of these PGRs on fine turf such as that found on golf courses and home lawns. With this transition, new reserch questions arise that traditionally were not considered. One such question is the possibility of using PGRs to enhance the transition from a warm-season permanent turf to the temporary cool-season turf used as overseeding. Therefore, research at the University of Florida was conducted to evaluate the possibility of using trinexapac-ethyl (PRIMO 1EĀ®), mefluidide (Embark 2SĀ®) and paclobutrazol (TGR 50WĀ®) to aid in the establishment of overseeded cool-season turfgrasses and to enhance the spring transition from overseeded cool-season turfgrass to the perrmanant bermudagrass. Several experiments conducted between 1994 and 1995 in Gainesville, FL on overseeded Tifway (or 419) bermudagrass fairways with perennial ryegrass. Plots were arranged in a randomized complete block design and replicated four times. Products were applied at various timings at 187 L haā»Ā¹ and rated for turfgrass density (%), turfgrass color (1 to 10 where 10=best turf and 5=minimum acceptable), and lateral growth (cm). Means were separated by Duncan's Multiple Range Test at p=0.05. In the first experiment, trinexapac was applied at 22 oz product/A monthly from January through April in an attempt to maintain a desirable turf cover and color during the spring transition period. Initial applications provided a slight (15%) decrease in ryegrass density compared to the untreated when rated in late February. However, by late March through April, the trinexapac treated plots had an increase (ā
15%) in ryegrass density compared to the untreated. This probably is from the emerging bermudagrass being slightly stunted by the PGR, allowing the ryegrass to remain. By July, differences in bermudagrass density was not evident from the four trinexapac applications. Applications of mefluidide at 8 oz product/A or paclobutrazol at 1 lb product/A during January had ā
15% reduction in ryegrass stand density 5 weeks after treatment with no effect on ryegrass or bermudagrass afterwards. In the second experiment, trinexapac was applied on a monthly basis at 22 oz product/A initiated in October and continued through February to see its effect on ryegrass establishment in the fall as well as the effects on spring transition. Ryegrass establishment was enhanced ā
20% when trinexapac was applied just prior to overseeding. This trend continued through March except during January. By April, ryegrass density was similar between treated and untreated plots. However, as observed in the first experiment, a slight (ā
15%) increase in ryegrass stand density continued through May. In a third study, bermudagrass lateral (stoloniferous) growth was measured following mefluidide (4 to 18 oz/A) or trinexapac (11 or 22 oz/A) application. Mefluidide had no influence on bermudagrass lateral growth while trinexapac stunted lateral growth up to six weeks. A rate response was seen with ā
20% reduction at the 11 oz/A rate and ā
25% reduction at the 22 oz/A rate. This may be benificial when chemically edging areas such as around bunkers. Overall trinexapac ethyl stunted bermudagrass growth enough to allow better perennial ryegrass overseeding establishment and delayed the ryegrass transition in spring. Mefluidide applied in early January temporarily (ā
5 weeks) reduced perennial ryegrass (ā
15%) stand while paclobutrazol had little effect on perennial ryegrass density or bermudagrass spring transition. Trinexapac limited bermudagrass lateral growth ā
25% for 6 weeks following treatment." |
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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):
McCarty, L. B., and J. S. Weinbrecht. 1996. Trinexapac-ethyl (PRIMOĀ®) as an overseeding and transition establishment aid. South. Weed Sci. Soc. Proc. 49:p. 72. |
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