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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.;
Krouse, J. M. |
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| Author Affiliation: | Department of Agronomy, University of Maryland, College Park , MD 20742 |
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| Title: | Curative control of red thread, 1993 |
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| Source: | Fungicide and Nematicide Tests. Vol. 49, 1994, p. 353. |
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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: Festuca rubra; Red thread; Laetisaria fuciformis; Disease control; Fungicide evaluation; Fungicides; Azoxystrobin
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| Cultivar Names: | Flyer |
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| Abstract/Contents: | "Fungicide treatments were initiated 8 Apr and some minor foliar blighting by L. fuciformis was actively occurring. Fungicides were applied with CO2 pressurized (36 psi) sprayer calibrated to deliver 2.5 gal water per 1000 ft2. Soil was a Chillum silt loam with a pH of 6.4 and 2.6% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replications. Percent of plot area blighted was assessed visually on a linear 0 to 100% scale where 0 = entire plot area green and 100 = entire plot area blighted. Treatments with ratings exceeding 2% of plot area blighted would be considered to have provided unacceptable control for a golf course fairway. Overall turf quality was determined visually on a 0 to 10 scale where 0 = brown or dead turf, and 10 = optimum greenness and density. The level of disease pressure was in the moderately severe range. Fifteen days after initial treatment (23 Apr), plots sprayed with Fore, RH-7592 and RH-611 already exhibited > 2% blighting. Disease damage increased slowly in plots treated with the aforementioned fungicides from 23 Apr to 19 May. All other treatments provided commercially acceptable red thread control; however, Eagle-treated turf had only marginally acceptable blight levels on 19 May. Excellent red thread control was provided by ICIA 5504, chipco 26019, EXP 10452A, and EXP 10357A + EXP 02164B. Eagle was phytotoxic and elicited a yellow-brown foliar discoloration and some thinning of the stand. Eagle-introduced injury was most evident on 7 May, but turf exhibited some recovery by 19 May. The high rate of ICIA 5504 appeared to provide enhancement in foliar greenness, which was most conspicuous on 7 May. Only ICIA 55045 (0.35 and 0.53 oz)-treated plots exhibited a significant improvement in quality when compared to untreated plots on 19 May. This higher quality was due to a combination of excellent red thread control and an enhancement in green foliar color. The quality of ICIA 5504-treated turf, however, was not statistically greater than most other fungicide treated plots. Lowest quality ratings were observed in plots treated with Eagle and RH-7592, and untreated plots." |
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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 J. M. Krouse. 1994. Curative control of red thread, 1993. Fungicide Nematicide Tests. 49:p. 353. |
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