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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H.;
Krouse, J. M.;
Feng, Y. |
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| Author Affiliation: | Department of Natural Resource Sciences & LA, University of Maryland, College Park, MD |
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| Title: | Brown patch control with Bayer fungicides, 1998 |
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| Source: | Fungicide and Nematicide Tests. Vol. 54, 1999, p. 482. |
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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; Disease control; Brown patch; Rhizoctonia solani; Fungicide evaluation; Application rates; Color; Plant density; Disease severity; Penconazole; Triadimefon; Azoxystrobin; Tank mix; Quality
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| Cultivar Names: | Bardot |
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| Abstract/Contents: | "Fungicides were applied with a CO₂ pressurized (34 psi) sprayer equipped with a flat-fan (8010) nozzle, and calibrated to deliver 2.5 gal water per 1000 ft². Treatments were applied on 21-day intervals on the dates footnoted in the data table. Soil was a Chillum silt loam with a pH of 6.0 and 2.5% OM. Turf was maintained at about 0.60 inches, and was fertilized with 2.0 lb N/1000 ft²/yr in the fall. Plots were 5 ft x 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted was assessed visually on a linear 0 to 100% scale where 0 = entire plot area green and healthy, and 100 = entire plot area blighted. Ratings exceeding 2% blight would be considered unacceptable for golf course fairways and tees. Turf quality was visually assessed on a 0 to 10 scale where 10=optimum greenness and density. Disease pressure remained low to moderate throughout most of Jun and Jul due to frequent shifts in weather conditions that brought cool nights temperatures. Disease pressure became severe in Aug. Throughout the routine spray period (i.e., up to 20 Jul = 19-days since last applied = DSLA), all treatments provided excellent (<1% blighting) brown patch control (all data not shown). Between 24 and 29 Jul, Bayleton and Bayleton + Thalonil began to breakdown (i.e. 28 DSLA). Except for the aforementioned Bayleton treatments, all other treatments continued to provide commercially acceptable control to 10 Aug (40 DSLA). By 14 Aug, disease pressure was severe and Lynx + Heritage (0.278 + 0.2 oz) and Bayleton + Heritage (both rates) wers still providing commercially acceptable control (i.e., ≤2% blighting). Some plots treated with the high rate of Bayleton were subjected to a secondary leaf infection by Bipolaris sorokiniana. Best turf quality on 14 Aug was observed in plots treated with Bayleton + Heritage (both rates) and Heritage." |
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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):
Dernoeden, P. H., J. M. Krouse, and Y. Feng. 1999. Brown patch control with Bayer fungicides, 1998. Fungicide Nematicide Tests. 54:p. 482. |
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MSU catalog number: SB 951.3 .F82 |
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