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| Web URL(s): | https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2006/T017.pdf
Last checked: 11/14/2016
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | McDonald, S. J.;
Dernoeden, P. H. |
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| Author Affiliation: | Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, Maryland |
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| Title: | Preventive dollar spot control in creeping bentgrass as influenced by spray volume and a spring application of fungicides, 2005 |
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| Section: | Turfgrass
Other records with the "Turfgrass" Section
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| Source: | F&N Tests. Vol. 61, 2006, p. T017. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 3 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Dollar spot; Preventive control; Application rates; Propiconazole; Spray volumes
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| Cultivar Names: | Southshore |
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| Abstract/Contents: | "The purpose of this study was to evaluate the residual effectiveness of a single preventive application of Banner MAXX and a tank-mix of Banner MAXX plus Daconil Ultrex in two spray volumes on dollar spot control. Treatments were applied with a CO2 pressurized (34 psi) sprayer calibrated to deliver either 1.1 or 2.5 gal water per 1000 sq ft. Spray volumes of 1.1 and 2.5 gal. water per 1000 sq ft were applied using a Tee Jet 8004 and a Tee Jet 8010 nozzle, respectively. All treatments were applied once on either 11 Apr, 3 May or 1 Jun to a dry canopy and before dollar spot became visually active. Creeping bentgrass was seeded in Sep 04 and was fertilized with 3.0 lb N per 1000 sq ft in the autumn of 2004. Turf was mowed three times weekly to a height of 0.6-in. Soil was a Keyport silt loam with a pH of 5.8 and 3.6% OM. Plots were 5 ft by 5 ft, and were arranged in a randomized complete block with three replications. Dollar spot was rated by counting the number of S. Homoeocarpa infection centers plot-1. An acceptable disease threshold in a creeping bentgrass fairway was judged to be ≤ 5 infection centers plot-1. Data were subjected to analysis of variance (ANOVA) and significantly different means were separated according to Tukey's protected least significant difference t-test at P=0.05. Dollar spot became active in the study site on 10 Jun. Initially, disease pressure was low, but became moderately severe by mid-Jul. Few statistical differences were observed among treatments between 10 Jun and 7 Jul. Except Banner MAXX and Banner MAXX + Daconil Ultrex applied in 1.1 gal. per 1000 sq ft and Banner MAXX applied in 2.5 gal per 1000 sq ft on 11 Apr, all other treatments provided complete dollar spot control until 20 Jun. On 20 Jun, dollar spot became active in plots treated with Banner MAXX + Daconil Ultrex applied on 3 May in 2.5 gal. per 1000 sq ft . Untreated plots had dollar spot levels that exceeded the threshold on 1 Jul. By 7 Jul, only the tank-mix applied on 3 May or 1 Jun in both spray volumes and Banner MAXX-alone applied in 1.1 gal. per 1000 sq ft on 1 Jun had dollar spot levels less than what was observed in the untreated plots. Only plots receiving Banner MAXX and Banner MAXX + Daconil Ultrex on 1 Jun in 1.1 gal per 1000 sq ft were disease-free on 7 Jul. By 15 Jul, Banner MAXX applied in 1.1 gal per 1000 sq ft on 11 Apr and Banner MAXX applied in 2.5 gal. per 1000 sq ft on 1 Jun had dollar spot levels equal to the untreated control, while all other treated plots had less dollar spot versus the untreated control. At this point in time (15 Jul), only the tank-mixes applied on 3 May and 1 Jun (in both spray volumes), had dollar spot levels below the threshold. All treatments exceeded the threshold on the final rating date (22 Jul). On the final rating date (22 Jul), only the tank-mix applied in 2.5 gal per 1000 sq ft on 3 May and the tank-mix treatments applied in both spray volumes on 1 Jun had dollar spot levels below the untreated control. Data suggest that the 3 May and 1 Jun dates of applications were more effective in providing residual dollar spot control, when compared to treatments applied 11 Apr. Longevity was sacrificed by the 11 Apr treatment, since these were the first treated plots to develop unacceptable levels of dollar spot. The most effective treatments were able to provide an acceptable level of dollar spot control (i.e. ≤ 5 infection centers plot-1) for 35 d following the onset of symptoms. Banner MAXX and Banner MAXX + Daconil Ultrex applied in 1.1 gal. per 1000 sq ft on 1 Jun provided the longest period (27 d) of complete dollar spot control. There were, no significant difference among spray volume treatments." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
McDonald, S. J., and P. H. Dernoeden. 2006. Preventive dollar spot control in creeping bentgrass as influenced by spray volume and a spring application of fungicides, 2005. F&N Tests. 61:p. T017. |
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| Web URL(s):
https://www.plantmanagementnetwork.org/pub/trial/fntests/reports/2006/T017.pdf
Last checked: 11/14/2016
Requires: PDF Reader |
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MSU catalog number: SB 951.3 .F82 |
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