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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/2000/72126, Cornell, Harman, dollar spot.PDF
Last checked: 02/06/2013
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Harman, Gary E.; Ondik, Kristen L.; Nelson, Eric B. |
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| Author Affiliation: | Harman and Ondik: Department of Horticultural Sciences, Cornell University, NYSAES, Geneva, NY; and Nelson: Department of Plant Pathology, Cornell University, Ithaca, NY |
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| Monograph Title: | The Basic Biology and Etiology of Sclerotinia homoeocarpa, the Casual Agent of the Dollar Spot: [2000 Annual USGA Report], [2000]. |
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| Publishing Information: | [Ithaca, New York]: Cornell University |
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| # of Pages: | 8 |
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| Collation: | [8] pp. |
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| Abstract/Contents: | "The first objective was to examine the development, including possible apothetical production, of the pathogen in creeping bentgrass greens when present in leaf tissue, in root tissue, or as isolated stroma and to determine the length of survival of the pathogen in infected tissue or as stroma. Our data suggest that the basic biology of Sclerotinia homoeocarpa, including the form in which it exists when it is not causing disease, is not known. Forther, there may be at least two stages of the life cycle: one is a slow-growing quiescent phase and the other is a pathogenic and aggressive phase. However, even the quiescent phase could not be detected in sites where the pathogen killed the turf. We have not determined where it survives or the form that it is in. Preliminary observational data indicated that the dollar spot lesion itself does not contain living hyphae but rather that the pathogen is located outside of the lesion. An understanding of this life cycle should provide new capabilities of controlling the pathogen, including intercepting the pathogen before significant disease occurs as a consequence of secondary infection. The second objective was and to measure the genotypic variation of the pathogen from similar and diverse geographical locations using RAPD analysis anatomosis groupings. A collection was made that contains a range of isolates from different areas and different hosts. This collection has been sorted to indicate differences in genetic diversity. There is a substantial level of genetic heterogeneity in the strain collection. Resistance to pesticides appears to differ substantially between strains. It may be that variability exists in the resistance to fungicides and that continued application results in selection of resistant phenotypes. Studies on the relationship between genetic diversity and pathogenicity to different cultivars of bentgrass are underway. Differences in pathogenicity must be understood in order for control programs, ranging from resistant varieties to chemical or biological control, to be optimally successful. Our first data suggest that aggressiveness of isolates differ between bentgrass cultivars. If so, then the native diversity within Sclerotinia homoeocarpa isolates must be considered in breeding or other efforts to develop disease-resistant bentgrass. |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related summary article, "The basic biology and etiology of Sclerotinia homoeocarpa, the casual agent of dollar spot", 2000 Turfgrass and Environmental Research Summary [USGA], 2000, p. 23, R=72126. R=72126 |
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| Note: | Also appears as pp. 637-644 in the USGA Turfgrass Research Committee Reporting Binders for 2000
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Last checked: 02/06/2013
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