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| Publication Type:
| Report |
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| Author(s): | Dernoeden, P. H. |
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| Author Affiliation: | Department of Natural Resource Sciences & LA, University of Maryland, College Park, MD |
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| Title: | Summer patch control in Kentucky bluegrass with DMI fungicides; 1997 |
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| Source: | Fungicide and Nematicide Tests. Vol. 53, 1998, p. 456. |
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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; Magnaporthe poae; Disease control; Fungicides; Propiconazole; Trinexapac-ethyl; Tank mix; Cyproconazole; Penconazole; Application rates; Triadimefon; Azoxystrobin
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| Abstract/Contents: | "Summer patch control of Kentucky bluegrass with DMI fungicides; 1997. Fungicides were applied with a CO₂ pressurized (35 psi) sprayer calibrated to deliver 2.5 gal water per 1000 sq ft. The fungicides were not watered-in. Dates of application appear in the data table. Turf was a fall 1995 seeded stand of Baron Kentucky bluegrass maintained at a 1.75 in. mowing height. Soil was a Chillum silt loam with a pH of 6.5 and 2.1% OM. Plots were 5 ft by 10 ft, and were arranged in a randomized complete block design with four replications. Percent of plot area blighted was assessed visually on a linear 0 to 100% scale where 0=no blight and 100=entire plot area blighted. The number of patches in each plot also were counted and these data represent the best measure of disease control. Turf quality was assessed visually on a 0-10 scale where 0=entire plot brown or dead; 8.0=minimum acceptable quality for a lawn; 9.0=minimum acceptable quality for a fairway or tee; and 10=optimum greeness and density. Jul was hot and dry and summer patch did not appear until early Aug. Patch distribution across the site was excellent, however, low humidity and cool nights and lack of thunderstorms resulted in little spread from the infection centers. As a result, patch diameter averaged only 2-3 inches. While disease distribution was outstanding, the lack of any substantial increases in patch diameter resulted in low overall blight ratings. There was little increase in patch number development between 21 Aug and 5 Sep. Except Primo, all treatments reduced patch number and percent of plot area blighted. Turf quality ratings are perhaps the best indicator of turf health. Plots with ≤1 patch per plot genereally exhibited commercially acceptable quality for golf turf (i.e., ≥9.0). All treatments, except Primo, were associated with quality that was superior to non-fungicide-treated plots. Banner MAXX + Primo Lynx (1.0 and 1.5 oz), and Bayleton (2.0 oz)-treated plots had unacceptable quality for golf turf, but data did not vary significantly from those treatments subjectively judged as providing acceptable quality. Had patch diameter progressed to a normal size, it is likely that Banner MAXX + Primo, Lynx (1.0 oz), and Bayleton (2.0 oz)-treated plots would have been more severely damaged. Outstanding control (i.e., no patches in any replicate) was provided by Banner MAXX (4.0 fl. oz), Sentinel, Sentinel + Primo, Bayleton (4.0 oz), and Heritage (both treatments)." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H. 1998. Summer patch control in Kentucky bluegrass with DMI fungicides; 1997. Fungicide Nematicide Tests. 53:p. 456. |
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