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| Publication Type:
| Report |
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| Author(s): | Studstill, D.;
McCarty, L. B.;
Weinbrecht, J. |
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| Author Affiliation: | Department of Environmental Horticulture, University of Florida, Gainesville, FL 32611-0670 |
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| Title: | Tifway bermudagrass (Cynodon dactylon) response to plant growth retardants |
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| Meeting Info.: | 48th Annual Meeting, Memphis, TN, January 16-18, 1995 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 48, January 1995, p. 156-157. |
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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: Cynodon dactylon; Lolium perenne; Irrigation
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| Abstract/Contents: | "Tifway bermudagrass is used as landscape and recreational turf throughout the Southern U.S. Frequent mowings are required to maintain proper height and appearance. Plant growth retardants (PGRs) have the potential to reduce vegetative growth and the number of required mowings. Also, PGRs could minimize turf scalping and increase safety in dangerous-to-mow areas. Research was conducted at the University of Florida in 1992 through 1994 with the objective of monitoring turf phytotoxicity, height reduction, and number of mowings. Plots were 1.6 x 3.3m arranged in a randomized complete block design with 4 replicates. PGRs were applied in 187 L/ha of water with a ²-powered backpack sprayer. Percent density of perennial ryegrass (Lolium perenne LOLPE) and bermudagrass (Cynodon dactylon CYNDA) was visually rated on a 0 to 100 scale, where 0 = no cover and 100 = total cover. Percent height reduction was taken by averaging 5 measurements per plot and comparing these to the untreated. Also, phytotoxicity was visually rated on a scale from 1 to 10 where 5.0 = minimally acceptable and 10 = best turf color. In 1992, treatments and rates (kg ai/ha) included trinexapac-ethyl initially applied at 0.42 followed by 0.14 at 9 and 14 wk; paclobutrazol initially at 0.55 followed by 0.14 at 3, 8, 10 and 14 wk. In 1994, trinexapac-ethyl was initially applied to overseed ryegrass at 0.19 in January followed by 0.19 in February + March + April. Treatments in both studies were irrigated per label recommendation after application. In 1992, trinexapac-ethyl provided marginal bermudagrass phytotoxicity (5.0-5.9) up to 4 weeks after initiation (WAI). However, by 8 WAI trinexapac-ethyl had recovered and turf phytotoxicity was not significantly different to the untreated. Flurprimidol and paclobutrazol provided turf color >7.3 throughout the study. In 1992, trinexapac-ethyl provided >58% bermudagrass height reduction whereas flurprimidol and paclobutrazol provided <40% at 4 WAI. By 8 WAI, all treatments provided <15% height reduction. In 1992, the number of mowings for trinexapac-ethyl was reduced by 67% whereas flurprimidol and paclobutrazol reduced the number of mowings by 50% compared to the untreated plot. Furthermore, the 1st mowing cycle for trinexapac-ethyl occurred at 7 WAI while it was 2 WAI for flurprimidol and paclobutrazol. By the end of the study, trinexapac-ethyl required 4 mowings while flurprimidol and paclobutrazol required 6 mowings and the untreated required 12. In 1994, LOLPE transition density was 71% with trinexapac-ethyl compared to 58% for the untreated 8 WAI. At 16 WAI, LOLPE transition density was significantly greater (>35%) with trinexapac-ethyl compared to the untreated (<10%). By 23 WAI, there was no difference in CYNDA density between trinexapac-ethyl and the untreated plot. Overall, trinexapac-ethyl provided the best height reduction and fewer mowings than flurprimidol and paclobutrazol. However, trinexapac-ethyl provided marginal turf color 4 WAI as compared with remaining treatments. Trinexapac-ethyl allowed significantly greater (>35%) LOLPE transition density through 16 WAI compared to the untreated. Future research should explore various timings, rates, and determine if tank mixing PGRs is effective. Also, effect of PGRs on rooting systems should be explored." |
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| Language: | English |
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| References: | 0 |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Studstill, D., L. B. McCarty, and J. Weinbrecht. 1995. Tifway bermudagrass (Cynodon dactylon) response to plant growth retardants. South. Weed Sci. Soc. Proc. 48:p. 156-157. |
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