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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H.;
Krouse, J. M. |
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| Author Affiliation: | Department of Agronomy, University of Maryland, College Park, MD 20742 |
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| Title: | Residual effects of fungicides on red thread and dollar spot, 1994 |
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| Section: | Turf Grass Reports
Other records with the "Turf Grass Reports" Section
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| Source: | Fungicide and Nematicide Tests. Vol. 50, 1995, p. 371. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Lolium perenne; Red thread; Laetisaria fuciformis; Dollar spot; Sclerotinia homoeocarpa; Residual effects; Fungicide evaluation; Azoxystrobin
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| Cultivar Names: | Palmer; Prelude; Repell |
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| Abstract/Contents: | "Fungicides were applied with a CO² pressurized (35 psi) sprayer equipped with a flat-fan (8010) nozzle, and calibrated to deliver 2.5 gal water per 1000ft₂ on 7 Apr 1994. Soil was a Chillum silt loam with a pH of 5.9 and 2.5% OM. Turf was mowed to a height of 2.0 in., received no fertilizer in 1993 or 1994, and was not irrigated. Plots were 5 x 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted was visually assessed on a 0 to 100% scale where 0 = no blight and 100 = entire plot area blighted. Red thread and dollar spot ratings exceeding 5% and 0.5%, respectively would be considered unacceptable injury for a golf course fairway. While there were trace amounts of red thread blighting evident on 7 Apr, significant blighting did not appear until mid-May. Significant red thread activity did not begin until mid-May, about 30 days after fungicides were applied. All treatments were providing good red thread control (i.e., < 2% blight) as late as 20 May (i.e., 43 days after treatment). Good turf quality was associated with fungicide use on 20 May. Residual red thread control began to dissipate in plots treated with EXP 10452A, Daconil, and ASC 67098-Z (1.8 oz) by 31 May. On 16 Jun (i.e., 77 days after treatment), excellent residual red thread control was observed in plots treated with Bayleton, ICIA 5504, and ASC 67098-Z (3.6 oz). Dollar spot became active within the test area in mid-Jun, and plots receiving ICIA 5504 (0.4 oz) were more severely damaged than untreated turf. On 6 Jul (i.e., 89 days after treatment), excellent residual dollar spot control still was being provided by Bayleton." Data including treatment and rate per thousand square feet, percentage of plot area affected by red thread and dollar spot, and overall quality are presented in table form. |
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| Language: | English |
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| References: | 0 |
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| Note: | Report #361
Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., and J. M. Krouse. 1995. Residual effects of fungicides on red thread and dollar spot, 1994. Fungicide Nematicide Tests. 50:p. 371. |
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