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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Dernoeden, P. H.;
Fidanza, M. A.;
Wetzel, H. C. |
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| Author Affiliation: | Department of Agronomy, University of Maryland, College Park , MD 20742 |
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| Title: | Brown patch control with ICIA 5504 and subsequent effects on dollar spot, 1993 |
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| Source: | Fungicide and Nematicide Tests. Vol. 49, 1994, p. 326. |
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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: Agrostis tenuis; Brown patch; Dollar spot; Rhizoctonia solani; Sclerotinia homoeocarpa; Fungicide evaluation; Fungicides; Azoxystrobin
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| Cultivar Names: | Bardot |
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| Abstract/Contents: | "Fungicides were applied initially before blighting by R. solani on either a 14 or 21 day interval. Dates of application are footnoted in the data table. Materials were applied with CO2 pressurized (35 psi) sprayer calibrated to deliver 2.5 gal water per 1000 ft2. Soil was a Chillum silt loam with a pH of 6.1 and 3.5% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replicates. Percent of plot area blighted was visually assessed on a linear 0 to 100% scale where 0 = entire plot area green and 100 = entire plot area blighted. Brown patch pressure was severe by 12 Jul, but subsided in late Jul and Aug. Dollar spot pressure was moderately severe. Brown patch and dollar spot ratings exceeding 2% and 0.5%; respectively would be considered unacceptable control for golf course fairway turf. Between the initial application of fungicides on 7 Jun and 12 Jul, brown patch pressure was in the low to moderate range and all treatments were providing excellent disease control. No subsequent fungicide applications were made after 6 Jul, and the residual effectiveness of the materials was monitored weekly. It was not until 2 Aug when the level of brown patch control provided by CL 3336 (27 days since last applied) and CL 3336 + Daconil (35 days since last applied) became unacceptable. Loss of residual effectiveness of ICIA 5504 (21-day interval treatments) and Daconil was apparent by 9 Aug (about 42 and 33 days since last applied; respectively). The remarkable residual control by most materials was primarily attributed to a very low disease pressure period between late Jul through early-Aug. Brown patch began to intensify about 9 Aug and by 13 Aug all treatments, except ICIA 5504 (0.35 oz last applied 6 Jul), were providing unacceptable brown patch control. At this time, untreated turf appeared to be recovering; whereas, turf in plots treated with Daconil and CL 3336 were being severely blighted. This enhanced brown patch activity following the breakdown of fungicide residual is called resurgence. Dollar spot was first observed in high levels in early Aug, particularly in ICIA 5504-treated plots. Dollar spot in these plots often exceeded the levels observed in a non-fungicide-treated turf. It is not know whether ICIA 5504 encouraged dollar spot or if levels were low due to the presence of R. solani in untreated plots or in Daconil and CL 3336-treated plots experiencing brown patch resurgence." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: DOLLAR |
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| Note: | This item is an abstract, with table, only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H., M. A. Fidanza, and H. C. Wetzel. 1994. Brown patch control with ICIA 5504 and subsequent effects on dollar spot, 1993. Fungicide Nematicide Tests. 49:p. 326. |
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