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| Publication Type:
| Report |
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| Author(s): | Vincelli, P.;
Doney, J. C. |
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| Author Affiliation: | Department of Plant Pathology, University of Kentucky |
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| Title: | Evaluation of fungicides for control of gray leaf spot of perennial ryegrass, 1996 |
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| Source: | Fungicide and Nematicide Tests. Vol. 52, 1997, p. 398. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 1 |
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| Abstract/Contents: | "The test was conducted on a sward at Griffin Gate Golf Course in Lexington, KY. The fairway was composed principally of perennial ryegrass seeded in Sep 95. It was maintained at a 0.88 in. mowing height, irrigated as needed, and fertilized with 4-4.5 lb N/1000 sq ft² per year, with approximately 2.5 lb N/1000 sq ft² being applied during the period of May-Sep. Plots measured 4 x 4 ft with 2-ft borders and were arranged in a randomized complete block design with four replications. Sprays were applied twice using a C)²-powered hand-held sprayer fitted with Spray Systems 8003E flat fan nozzles delivering 2.5 gal/1000 sq ft². Spray dates were 9 Aug and 26 Aug. Visual estimates were obtained of percent plot surface affected by gray leaf spot (three dates) and percent groundcover plot surface not covered with ryegrass (one date). All data were analyzed using ANOVA and the Waller-Duncan k-ratio test (P=0.05, k=100) after transformation; means of arcsine-transformed percentage data are presented in degrees, not percent. Samples were collected regularly and checked microscopically to monitor pathogen development. The trial was overseeded with perennial ryegrass on 10 Sep. Weather during July was cool with above-normal rainfall. During Aug, temperatures were seasonal with below-normal rainfall and fewer days reaching 90⁰ F than normal; several cold fronts passed through the state during the month. In Sep, temperatures were seasonal with above-normal rainfall. P. grisea was not detected on necrotic tissues or leaf spots collected on 1 Aug and 9 Aug. Symptoms and sporulation of P.. grisea were detected on 23 Aug. Substantial leaf blighting and tiller death developed in unsprayed plots and surrounding areas by late Aug. The level of damage was surprising given the generally favorable growing conditions experienced during Jul-Sep. Very abundant sporulation of P. grisea was found on necrotic tissues in control plots on 6 Sep during overcast weather. Sporulation of P. grisea on necrotic tissues was light on 17 Sep and 24 Sep. With one exception, the products tested provided acceptable control of gray leaf spot in this test. Plots treated with Chipco 26019 had uncacceptably high levels of leaf blighting, and intense sporulation by P. grisea was observed in these plots on 6 Sep. Seedlings from the 10 Sep overseeding were free of symptoms of gray leaf spot on 24 Sep in all plots examined, including control plots." |
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| Language: | English |
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| References: | 0 |
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| See Also: | Other items relating to: GLS |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P., and J. C. Doney. 1997. Evaluation of fungicides for control of gray leaf spot of perennial ryegrass, 1996. Fungicide Nematicide Tests. 52:p. 398. |
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