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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P.;
Fidanza, M.;
Wetzel, H. |
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| Author Affiliation: | Dept. of Agronomy, Univ. of Maryland |
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| Title: | Brown patch control in ryegrass, 1992 |
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| Source: | Fungicide and Nematicide Tests. Vol. 48, 1993, 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; Brown patch; Rhizoctonia solani; Fungicide application; Disease evaluation
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| Abstract/Contents: | "This study was initiated prior to visual disease symptoms on 11 Jun. Fungicides were applied on 14 or 21 day intervals with a CO2 pressurized (36 psi) sprayer in 2.5 gal water per 1000 ft2 on the dates footnoted in the data table. Turf was seeded in Sep 1990 and maintained at 1.5 inches. Soil was a Chillum silt loam with a pH of 5.9 and 1.6% OM. Plots were 5 by 5 feet, and were arranged in a randomized complete block with four replications. Percent of plot area blighted was determined visually on a 0 to 100% scale. Ratings that exceed 5% plot area blighted would be considered unacceptable control on a golf course fairway. Disease pressure was severe during late Jul. Significant disease injury in untreated plots did not occur until 13 Jul. Ratings conducted 13 and 20 Jul showed that all treatments were providing excellent brown patch control. All plots were last sprayed on 24 Jul and rainfall occurred within 1.5 hr of spraying the last treatment. Plots rated prior to sprayin on 24 Jul, however, showed that Lynx applied at 0.5 oz on either a 14 or 21 day interval and Curalan 4F had reduced effectiveness and control was unsatisfactory. Three days (i.e. 27 Jul) after the last application, Lynx (0.5 oz), and Silbos-treated plots had unacceptable levels of blighting. By 31 Jul, CL 3336-treated plots also exhibited unsatisfactory control. Rain on 24 Jul may have contributed to the reduced effectiveness of Lynx (0.5 oz), Silbos and CL-3336 by 31 Jul. Early Aug was very cool and some fungicide-treated plots recovered, however, by 10 Aug only plots treated with Lynx (1.0 oz), and Dyrene exhibited acceptable control. All fungicides, however, had significantly reduced blighting on all rating dates. Curalan and Chipco 26019 provided similar levels of brown patch control throughout the study." |
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| Language: | English |
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| References: | 0 |
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| Note: | Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P., M. Fidanza, and H. Wetzel. 1993. Brown patch control in ryegrass, 1992. Fungicide Nematicide Tests. 48:p. 371. |
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