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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: | Preventative brown patch control with fungicides, 1992 |
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| Source: | Fungicide and Nematicide Tests. Vol. 48, 1993, p. 370. |
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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 on 16 Jun prior to the appearance of visual disease symptoms. Fungicides were applied on 14, 21, or 28 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. On the final spray date (i.e. 3 Aug) fluazinam was not applied due to excellent residual brown patch control. Turf was seeded in Apr 1991 and was maintained at 1.5 inches. Soil was a Chillum silt loam with a pH of 6.4 and 2.1% 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. Environmental conditions were not conducive to brown patch in Jun and most of Jul. Pressure was moderately severe on 31 Jul and 19 Aug. Disease pressure was light on 16 and 20 Jul, and all treatments except Eagle on 20 Jul were providing commercially acceptable control. Disease pressure began to intensify in late Jul, and all treatments except Eagle, RHO 611 and RHO 7592 were providing excellent brown patch control. Plots treated with RHO 7592 were blighted more by R. solani than were non-fungicide-treated plots. By 31 Jul, RHO 611, as well as RHO 7592-treated plots (+ 24 day since last treatment) except Banner + Chipco 26019 were unacceptably damaged on 31 Jul. During this moderately severe disease pressure period, exceptional brown patch control was provided by fluazinam, Daconil 82.5SDG, and Banner + Chipco 26019. Fluazinam-treated plots exhibited an aesthetically pleasing color enhancement during all of Jul. All plots, except as previously noted, were retreated on 3 Aug. Weather conditions were cool, there was very low humidity, and brown patch subsided dramatically with all plots exhibiting good recovery by 10 Aug. The period from 13 to 17 Aug was very cool, but overcast and rainy. R. solani blighting was again moderately severe on 19 Aug and all treatments except RHO 611 and Daconil 82.5SDG were providing commericially acceptable control." |
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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. Preventative brown patch control with fungicides, 1992. Fungicide Nematicide Tests. 48:p. 370. |
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