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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H.;
Fidanza, M. A. |
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| Author Affiliation: | Dept. of Agronomy, Univ. of Maryland, College Park, MD |
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| Title: | Ryegrass density improved with fungicides following scalping and brown patch attack, 1991 |
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| Source: | Fungicide and Nematicide Tests. Vol. 47, 1992, p. 312. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Lolium perenne; Brown patch; Rhizoctonia solani
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| Abstract/Contents: | "The ryegrass stand was seeded early May 1991 and brown patch was active by early Jun. Treatments were applied on wither a 14 or 21 day intervals beginning 10 Jun and thereafter as footnoted in the data table. Fungicides were applied with a CO2 pressurized (36 psi) sprayer in 2.5 gal water per 1000 ft2. Soil was a Chillum silt loam with a pH of 5.9 and 1.6% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replications. Environmental conditons were conducive to severe brown patch. Unfortunately, the turf was extensively damaged by very low mowing on 5 Jul and turf density deteriorated dramatically. With loss of stand density, brown patch mycelium was seldom noted but plots not treated with fungicides exhibited a continuous reduction in green cover due to low level R. solani activity. Plots were assessed for blight damage on 25 Jun, and subsequently for percent bareground following scalping, using a 0 to 100% visual rating scale. The initial (25 Jun) blight rating showed that all fungicides provided a reduction in brown patch. Somewhat less initial control was provided by Lynx (0.5 oz) and Silbos (2.5 oz), when compared to nearly all other treatments. While the 5 Jul scalping left plots severely damaged, it was apparent as early as 12 Jul that plots treated with Lynx (0.75 oz + X-77) where going to recover their density mor rapidly than most other plots. In relative terms, good recovery of density on 29 Jul (i.e., decreases in % bareground ratings) was bieng provided by all Lynx treatments (except 0.5 oz on the 14 day interval); Silbos (5.0 and 7.5 oz); Daconil 2787 90DG; ASC 66825 (0.6 oz) and Touche. Similar ratings were obtained on 5 Aug. Brown patch was again visually active in the test site by mid-Aug and plots treated with Lynx (0.5 and 0.75 oz + X-77), and ASC 66518 (3.8 oz) had lowest bareground ratings on 19 Aug. There were, however, few significant differences among treatments and only Silbos (2.5 oz)-treated plots had bareground ratings statistically equivalent to untreated plots on the final rating date. The level of improvement in density accorded by a treatment was a direct result of a fungicides' ability to control brown patch." |
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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. H., and M. A. Fidanza. 1992. Ryegrass density improved with fungicides following scalping and brown patch attack, 1991. Fungicide Nematicide Tests. 47:p. 312. |
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