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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 reduced fungicide levels, 1993 |
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| Source: | Fungicide and Nematicide Tests. Vol. 49, 1994, p. 356. |
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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; Brown patch; Rhizoctonia solani; Disease control; Fungicide evaluation; Fungicides; Application rates
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| Cultivar Names: | Caravelle |
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| Abstract/Contents: | "Fungicide treatments were initially applied prior to any foliar blighting on 9 Jun. The second and third applications were delayed until R. solani foliar blighting [became] evident, which was on 7 and 21 Jul. Fungicides were applied with a CO2 pressurized (36 psi) sprayer calibrated to deliver 2.5 gal water per 1000 ft2. Soil was a Chillum silt loam with a pH of 6.2 and 2.7% 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. Treatments with ratings exceeding 2% of plot area blighted would be considered to have provided unacceptable brown patch control for a golf course fairway. Overall turf quality was visually determined on a 0 to 10 scale where 0 = brown or dead turf; and 8.0 = minumum acceptable quality for a golf course fairway; and 10 = optimum greenness and density. The level of disease intensity reached a severe level by mid-Jul, but declined rapidly thereafter. Except for Rubigan + Fore, most treatments reduced brown patch blighting when compared to untreated plots on 6 and 12 Jul. At this time, only ProStar had provided acceptable brown patch control. Prior to reapplication of fungicides on 21 Jul, brown patch had reached its greatest intensity when plots were rated 19 Jul. On that date, plots treated with Rubigan alone, Curalan (0.70 fl. oz) alone, Rubigan + Fore (1.0 + 3.52 oz) and TwoSome had blight ratings similar to untreated plots. All other treatments reduced brown patch, but only ProStar continued to provide acceptable control. Disease intensity was low by 3 Aug, and all plots showed signs of recovery. All fungicide-treated plots had lower blight ratings than non-fungicide-treated plots at this time. Lowest blight ratings and best quality were observed in plots treated with ProStar + Bayleton. Good recovery and turf quality also was provided by Fore (3.52 oz), Rubigan + Fore (1.0 + 2.64 oz), Rubigan + Curalan (both rates) and ProStar. Poorest turf quality was observed in plots treated with TwoSome. Data showed that reduced rates of selected fungicides treatments significantly reduced brown patch, but the level of control was judged to be unsatisfactory for a golf course fairway." |
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| Language: | English |
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| References: | 0 |
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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 reduced fungicide levels, 1993. Fungicide Nematicide Tests. 49:p. 356. |
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