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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.;
Wetzel, H. C.;
Fidanza, M. A. |
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| Author Affiliation: | Department of Agronomy, University of Maryland, College Park , MD 20742 |
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| Title: | Preventative control of summer patch with commercial and experimental fungicides, 1993 |
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| Source: | Fungicide and Nematicide Tests. Vol. 49, 1994, p. 345. |
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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: Poa pratensis; Summer patch; Magnaporthe poae; Disease control; Fungicide evaluation; Fungicides
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| Cultivar Names: | Fylking |
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| Abstract/Contents: | "Prior to fungicide application, all plots were inoculated at three points with M. poae on 25 May 1993. Most disease injury, however, was caused by natural infection. Fungicides were applied to the same plots on 16 Jun and 12 Jul 1993. These materials were applied with a CO2 pressurized (35 psi) sprayer calibrated to deliver 2.5 gal water per 1000 ft2. The fungicides were not watered-in. Turf was irrigated and mowed to a 1.75 inch height two times weekly during the test period. Soil was a Chillum silt loam with a pH of 6.3 and 2.7% OM. Plots were 5 by 5 ft, and were arranged in a randomized complete block with four replicates. Percent of plot area blighted was determined visually on a 0 to 100% linear scale where 0 = entire plot area green and healthy and 100 = entire plot area brown or dead. Overall turf quality was assessed on a 0 to 10 scale where 0 = entire plot area brown or dead and 10 = optimum greenness and density. Summer patch first appeared in early Jul, intensified during mid-to-late Jul, and reached maximum damage by mid-Aug. Disease pressure was extremely severe. Except for Daconil 2787 , fluazinam and Chipco 26019, all treatments reduced summer patch injury significantly. Daconil 2787 appeared to either encourage summer patch or it had been phytotoxic. Most Daconil 2787-treated plots were severely injured and distinct patches typical of summer patch were not generally evident on 20 Aug. Overall quality data provide a better, yet more subjective measure of disease control. This is because the percent blighting rating does not distinguish less severe foliar damage from the more destructive crater pit or dead patch symptoms. Using this subjective index, data suggest that the best control (i.e., lowest disease severity) was provided by EXP 10452A (4.0 oz), EXP 10064C, and Bayleton. Relatively good quality and therefore control, and statistically equivalent quality compared to the aforementioned treatments, were provided by EXP 10307A + EXP 02164B, and EXP 10307A (4.0 fl oz). Some control, but little if any improvement in turf quality, was provided by EXP 10452A (3.0 oz), EXP 10307A (3.0 fl oz), and Rubigan. Plots treated with fluazinam and Chipco 26019 had quality rating similar to non-fungicide-treated plots, suggesting they had no therapeutic activity against summer patch." |
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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., H. C. Wetzel, and M. A. Fidanza. 1994. Preventative control of summer patch with commercial and experimental fungicides, 1993. Fungicide Nematicide Tests. 49:p. 345. |
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MSU catalog number: SB 951.3 .F82 |
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