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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H. |
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| Author Affiliation: | Dept. of Agronomy, Univ. of Maryland, College Park, MD |
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| Title: | Curative red thread control and subsequent fungicide effects on anthracnose and summer patch, 1991 |
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| Source: | Fungicide and Nematicide Tests. Vol. 47, 1992, p. 305. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| Keywords: | TIC Keywords: Festuca rubra subsp. rubra; Red thread; Laetisaria fuciformis; Anthracnose; Colletotrichum graminicola; Summer patch; Magnaporthe poae; Disease control; Heat stress
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| Abstract/Contents: | "All fungicides, except vinclozalin and Curalin, were applied initially on 26 Mar. The aforementioned were applied 4 Apr, and all fungicides were reapplied on 23 Apr. Treatments 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 6.1 and 2.9% OM. Plots were 5 by 5 ft, 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. Red thread pressure was severe; anthracnose pressure was moderately severe; and summer patch was light to moderately severe. Anthracnose damage appeared as a browning and thinning of the turf from a standing position. Microscopic observation revealed that C. graminicola was primarily attacking sheath tissue and some infection was occurring on inner green sheaths, but basal rot was not evident. Summer patch developed very early in 1991 primarily because of a 15 day period of environmental stress in which 12 of 15 days (between 28 May and 12 June) had temperatures exceeding 90F. Data collected 22 and 29 Apr, and 8 May showed that all fungicides had significantly reduced red thread blighting. While there were few significant differences among treatments, Sentinel and ProStar generally provided best red thread control, especially when compared to Daconil 2787 4 F. Vinclozalin, Curalan, Daconil 2787 90WDG and Chipco 26019 also provided commercially acceptable red thread control. Anthracnose sheath blighting was observed on 9 May. While none of the fungicides controlled the disease, data indicated that Chipco 26019 exacerbated the disease; whereas, Daconil 2787 90WDG and Sentinel seemed to moderate anthracnose injury. Summer patch injury was increased significantly by Daconil 2787 4 F when compared to untreated or other fungicide-treated plots." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: Summertime Blues |
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| Note: | Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H. 1992. Curative red thread control and subsequent fungicide effects on anthracnose and summer patch, 1991. Fungicide Nematicide Tests. 47:p. 305. |
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