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| Publication Type:
| Report |
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| Author(s): | Vincelli, P. C.;
Powell, A. J. |
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| Author Affiliation: | Department of Plant Pathology; Department of Agronomy, University of Kentucky, Lexington, KY |
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| Title: | Reaction of perennial ryegrass varieties to red thread |
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| Source: | Biological and Cultural Tests for Control of Plant. Vol. 6, 1991, p. 102. |
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| Publishing Information: | St. Paul, MN: The American Phytopathological Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Lolium perenne; Red thread; Infestations; Diseases
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| Abstract/Contents: | "A natural infestation of Laetisaria fuciformis permitted evaluation of the relative resistance of perennial ryegrass varieties being evaluated in the National Turfgrass Evaluation Program. Plots measuring 4 x 6 ft were arranged in a randomized complete block design with three replicates, and were seeded on Sep 86 into a Maury silt loam at the University of Kentucky Spindletop Research FArm. Plots were maintained at a mowing height of 1.5 in. with clippings not removed, and fertilized annually woth 1.5 lb N/1000 ft2 in. Oct and Dec. Disease severity was assessed on 6 Jul 90 by visully assigning a rating to each plot of the percentage of plot surface showing symptoms of red thread. Although pink patch has also been detected in this site in the past, microscopic examination of samples indicated that Laetisaria fuciformis was the principle pathogen present. The rating scale used was: 0, 2, 5, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100% of plot affected. Each plot received two separate ratings (by one observer), which were averaged prior to data analysis. Data were arcsine-transformed and analyzed using analysis of variance and Duncan's multiple range test at alpha=0.05. Fifteen tillers (five per replicate) were collected on 3 OCT from plots of Manhattan, low-endophyte Manhattan II, and high-endophyte Manhattan II. Using a Southern blot procedure, these were tested for the presence of the fungal endophyte, Acremonium lolii. Disease severity ranged from 10.8% in Regal and high-endophyte Manhattan II to 45.0% in Ronja. Of 15 tillers, 0, 3, and 15 tested positive for fungal endophyte in Manhattan, low-endophyte Manhattan II, and high-endophyte Manhattan II, respectively. High-endophyte Manhattan II exhibited significantly (P=0.05) less symptoms of red thread than low-endophyte Manhattan II. Assuming an identical genotype in both Manhattan II varieties, the presence of A. lolii increased resistance to L. fuciformis in the Manhattan II variety of perennial ryegrass. A number of varieties differed significantly (P=0.05) in susceptibility may exist that were not statistically separable in this test. Over such a large test with few replications, variability due to nonuniform distribution of inoculum could decrease statistical precision, making detection of true differences between varieties difficult. Given the great range in susceptibility observed in this test, resistance of perennial ryegrass varieties to red thread should be an important consideration in selecting varieties for landscapes and golf fairways." |
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| Language: | English |
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| References: | 0 |
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| Note: | Table |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vincelli, P. C., and A. J. Powell. 1991. Reaction of perennial ryegrass varieties to red thread. Biol. Cult. Tests Control Plant Dis. 6:p. 102. |
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