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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.;
Praemassing, W. |
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| Author Affiliation: | Dept. of Agronomy, Univ. of Maryland, College Park, MD |
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| Title: | Brown patch control and resurgence with Daconil and Silbos, 1990 |
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| Source: | Fungicide and Nematicide Tests. Vol. 46, 1991, p. 323. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Fungicide evaluation; Lolium perenne; Brown patch; Rhizoctonia solani; Fungicides; Diseases; Disease control; Chlorothalonil; Vinclozolin; Thiram
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| Abstract/Contents: | "Fungicide applications were initiated prior to the appearance of R. solani activity. Treatments were applied on either a 14 or 28-day interval on the dates 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 7.1 and 1.3% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted or covered with foliar mycelium were determined visually on a 0 to 100% scale. Disease pressure ranged from moderately severe to extremely severe. Ratings that exceed 5% plot area blighted would be considered unacceptable control on a golf course fairway. Foliar mycelium was observed 16 Jul prior to blighting of foliage. On that date, mycelial growth was slight where Daconil 90DG and 4F, ASC 66900, and the two high rates of Silbos were applied. Foliar damage was evident by 23 Jul, particularly in ASC 66811 (0.15 fl oz) and untreated plots. All fungicides reduced blighting significantly on 23 and 30 Jul (+ 14 days of last spray), and commercially acceptable control was observed in plots treated with Daconil 90DG, ASC 66900, Daconil 2787 4F, Daconil + ASC 66811 (6.0 + 3.0 fl oz), Ronilan + thiram, and Silbos (4.0 and 6.0 oz). By 10 Aug (+ 25 days of last spray), no treatment provided acceptable control, but significantly less blighting was observed only where Silbos (4 oz) was applied. Brown patch resurgence was evident on 10 Aug, and by 18 Aug plots treated with Daconil 90DG, ASC 66900, Daconil 2787 4F, Daconil + ASC 66811, and Silbos (2.0 oz) exhibited a significantly greater amount of blighting than those plots that had received no fungicide treatment." |
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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., and W. Praemassing. 1991. Brown patch control and resurgence with Daconil and Silbos, 1990. Fungicide Nematicide Tests. 46:p. 323. |
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