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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/pdmr/reports/2007/T029.pdf
Last checked: 11/14/2016
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Tredway, L. P.;
Butler, E. L.;
Soika, M. D. |
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| Author Affiliation: | Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina |
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| Title: | Effects of ethephon and trinexapac-ethyl on annual bluegrass putting greens, 2006 |
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| Source: | PDMR: Plant Disease Management Reports. Vol. 1, 2007, p. T029. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Ethephon; Trinexapac-ethyl; Poa annua; Golf greens; Quality; Seedhead development; Disease development; Dollar spot; Comparisons; Growth regulators
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| Abstract/Contents: | "Two plant growth regulators were evaluated for their effect on turf quality, seedhead production, and disease development in annual bluegrass putting greens. This trial was conducted at the Blowing Rock Country Club in Blowing Rock, NC on a mixed stand of annual bluegrass (~90%) and creeping bentgrass (~10%) maintained under putting green conditions. Plots were 3.33 ft x 6 ft and were arranged in a randomized complete block with four replications. Fungicides were applied in water equivalent to 1 gal per 1000 sq ft with a CO2 powered sprayer at 40 psi using TeeJet 8002 nozzles. All treatments were initiated on 29 Mar. Fungicides were reapplied at the appropriate intervals as indicated in the table. Dollar spot incidence was evaluated on 7 and 12 Jul by counting the number of dollar spot infection centers per plot. Percent turf area exhibiting annual bluegrass seedheads was assessed on 28 Apr, 7 Jun, and 12 Jul. Turfgrass quality was evaluated on 7 Jun and 12 Jul, using a 1 to 9 scale (9=best, 5=acceptable) based on color, density, and uniformity. Data were subjected to analysis of variance and means separation by Waller-Duncan k-ratio t test (k=100). No treatments provided significant suppression of seedhead formation on 28 Apr, presumably because applications were initiated too late to control this initial flush of seed production. Two additional flushes of seedhead formation occurred and were evaluated on 7 Jun and 12 Jul. On 7 Jun, all treatments provided a significant reduction in seedhead formation, but repeat applications of Proxy or Proxy + Primo Maxx provided superior control compared to single applications. On 12 Jul, only treatments receiving 4 applications of Proxy or Proxy + Primo Maxx provided excellent seedhead suppression. Plots receiving 3 or 4 applications of Proxy alone exhibited increased dollar spot incidence on 12 Jul, but Proxy + Primo Maxx had no impact on dollar spot development. Plots treated with Proxy alone on 24 May exhibited reduced turf quality on 7 Jun in the form of severe chlorosis, and similar effects were observed on 12 Jul resulting from the treatment applied on 28 Jun. Treatments containing Proxy + Primo Maxx did not induce chlorosis or reduce turfgrass quality. Throughout the trial, no differences were observed between treatments receiving 4 applications of Proxy + Primo Maxx or 1 application of Proxy followed by 3 applications of Proxy + Primo Maxx. Repeat applications of Proxy are necessary to obtain season-long suppression of annual bluegrass seedheads, but this can cause reductions in turf quality and increased susceptibility to dollar spot. Proxy + Primo Maxx combinations provide similar benefits in seedhead suppression without these negative side effects." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is as abstract and tables only!
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Tredway, L. P., E. L. Butler, and M. D. Soika. 2007. Effects of ethephon and trinexapac-ethyl on annual bluegrass putting greens, 2006. PDMR: Plant Dis. Manage. Rep. 1:p. T029. |
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Last checked: 11/14/2016
Requires: PDF Reader |
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