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| Web URL(s): | http://usgatero.msu.edu/v02/n11.pdf
Last checked: 7/2003
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Uddin, Wakar;
Viji, Gnana;
Vincelli, Paul |
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| Author Affiliation: | Uddin: Assistant Professor, Deparment of Plant Pathology, The Pennsylvania State University, University Park, Pennsylvania; Vigi: Plant Pathology Post-doc, Department of Plant Pathology, The Pennsylvania State University, University Park, Pennsylvania; Vincelli: Extension Plant Pathologist, Department of Plant Pathology, University of Kentucky, Lexington, Kentucky |
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| Title: | Gray leaf spot of perennial ryegrass turf: An emerging problem for the turfgrass industry |
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| Source: | USGA Turfgrass and Environmental Research Online. Vol. 2, No. 11, June 1 2003, p. [1-20]. |
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| Publishing Information: | Far Hills, NJ: United States Golf Association, Green Section |
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| # of Pages: | 20 |
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| Keywords: | TIC Keywords: Gray leaf spot; Lolium perenne; Disease profile; Disease control; Disease severity; Festuca arundinacea; Mowing height; Golf rough; Shade; Humidity; Summer; Inoculation; Disease development; Temperatures; Fungicide application; Azoxystrobin; Trifloxystrobin; Thiophanate-methyl; Nitrogen fertilization; Nitrogen fertilizers
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| Abstract/Contents: | "In recent years, severe outbreaks of gray leaf spot have resulted in extensive damage to perennial ryegrass golf course fairways and athletic fields, particularly in the mid-western and northeastern United States. Plant pathologists at a number of universities including Pensylvania [Pennsylvania] State University and the University of Kentucky, are conducting comprehensive studies to unravel the mysteries of this devastating disease. Among their findings: Since the first report of gray leaf spot on perennial rye-grass in 1991, outbreaks of gray leaf spot have occurred sporadically, resulting in serious loss of turf in 1995, 1998, and 2000 in the mid-Atlantic region. The disease has recently been reported from the Midwest, New England, and the western United States. DNA analysis showed the vast majority of pathogen isolates were distinct from wheat blast isolates, but closely related to isolates from tall fescue. Gray leaf spot is often observed first in turf in golf course rough maintained at higher mowing heights. These areas may be partially shaded and have extended leaf wetness periods and high humidity that are more conducive for infection. Gray leaf spot normally develops from early August to mid-October. Environmental conditions prevailing during this late summer period and availability of inoculum are major determinants in the development of gray leaf spot epidemics. Studies showed that temperatures between 26-29 C (79-84 F) were optimal for disease development. Among currently labeled fungicides, the most effective materials for gray leaf spot control are azoxystrobin, trifloxystrobin, and thiophanate methyl. Timely use of fungicides can help prevent the disease epidemic from reaching its logarithmic phase. Increasing the amount of nitrogen increases gray leaf spot severity. Source of nitrogen also influences gray leaf spot development. A recent study has shown that gray leaf spot severity was lower when controlled-release forms of nitrogen were applied compared to fast-release nitrogen sources." |
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| Language: | English |
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| References: | 75 |
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| See Also: | See also related journal article in Plant Disease, 87(8), August 2003, p. 880-889, R=89669. R=89669
See also related article, "Gray leaf spot of perennial ryegrass turf: An emerging problem for the turfgrass industry", USGA Green Section Record, 41(6) November/December 2003, p. 9-13, R=91859 R=91859 |
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| See Also: | Other Reports from this USGA research project: 2002-01-231 |
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| Note: | Pictures, color
Figures
Charts
Graphs
Summary as abstract |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Uddin, W., G. Viji, and P. Vincelli. 2003. Gray leaf spot of perennial ryegrass turf: An emerging problem for the turfgrass industry. USGA Turfgrass Environ. Res. Online. 2(11):p. [1-20]. |
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| Web URL(s):
http://usgatero.msu.edu/v02/n11.pdf
Last checked: 7/2003
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 A65 [online] |
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