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| DOI: | 10.1094/PHYTO-102-7-S4.1 |
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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO-102-7-S4.1#page=56
Last checked: 08/10/2012
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Huang, Y.;
Landschoot, P.;
Kaminski, J. |
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| Author Affiliation: | The Pennsylvania State University, University Park, PA |
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| Title: | Influence of dew removal methods and plant growth regulators on fungicide efficacy for the control of dollar spot in turf |
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| Meeting Info.: | Providence, Rhode Island: August 4-8, 2012 |
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| Source: | Phytopathology. Vol. 102, No. 7S, July 2012, p. S4.56. |
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| Publishing Information: | St. Paul, Minnesota: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Control methods; Dew reduction; Disease control; Dollar spot; Fungicide efficacy; Fungicide evaluation; Plant growth regulators; Sclerotinia homoeocarpa
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| Cultivar Names: | Penneagle |
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| Abstract/Contents: | "Dollar spot, caused by the pathogen Sclerotinia homoeocarpa F.T. Bennett, is a disease of all turfgrass species and is considered the most economical important disease on golf courses. Canopy moisture (e.g., leaf wetness) plays an important role in the development of dollar spot. It is suggested that displacement of dew in the morning can reduce symptoms by interrupting prolonged periods of leaf wetness required for disease development. In addition to the use of cultural practices, fungicides are often applied throughout the season to provide additional suppression. The effect of canopy moisture at the time of fungicide application, however, is not well understood. The objectives of this field study were to elucidate the influence of dew removal methods and plant growth regulators on the length of dollar spot control with fungicides. In 2011, a field study was initiated at the Joseph Valentine Turfgrass Research Center on a mature Penneagle creeping bentgrass (Agrostis stolonifera L.) maintained as a golf course fairway. The study setup was a 2 x 3 x 4 factorial arranged as a randomized complete splitplot design with four replications. The main factors included three dew removal strategies (none, rolled and mowed) prior to the application of fungicides (none, chlorothalonil, propiconazole and iprodione) and plant growth regulators (none and trinexapac-ethyl). On 17 August, dew removal treatments were initiated at 0800 and immediately prior to the application of fungicides and PGRs. While dew removal treatments and fungicides were applied once, PGR treatments were applied every 14-days for a total of 5 applications. Once active, dollar spot severity was assessed three times per week by counting the number of infection centers (IC) per plot. Dollar spot IC and area under the disease progress curve data were analyzed using the PROC MIXED procedure in SAS. Trace levels of dollar spot were present when treatments were initiated on 17 Aug. Disease pressure continued to increase and by 23 Aug all fungicides provided a significantly fewer ICs than the untreated control. On all remaining rating dates, all fungicide-treated plots (regardless of treatment) had significantly less dollar spot when compared to the untreated control. On 5 of 14 rating dates, a fungicide x PGR interaction was observed. On these dates, plots treated with trinexapac-ethyl had equal or fewer dollar spot IC when compared across their respective fungicide treatment. In plots receiving no fungicides, trinexapac-ethyl reduced dollar spot IC on all five dates where the interaction was significant. Results from this study indicate that the presence or absence of dew at the time of fungicide application has little influence on the duration of fungicide efficacy. In situations where fungicide use is restricted, however, the application of trinexapac-ethyl may result in a reduction in dollar spot severity. Additional trials will be initiated in 2012 to determine potential seasonal variation in dollar spot suppression relates to dew removal." |
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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):
Huang, Y., P. Landschoot, and J. Kaminski. 2012. Influence of dew removal methods and plant growth regulators on fungicide efficacy for the control of dollar spot in turf. Phytopathology. 102(7S):p. S4.56. |
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| DOI: 10.1094/PHYTO-102-7-S4.1 |
| Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO-102-7-S4.1#page=56
Last checked: 08/10/2012
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2219736a |
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Digitally in TIC by file name: phytp2012julpres |
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