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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PDIS.2002.86.12.1290
Last checked: 08/26/2010
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Kaminski, J. E.;
Dernoeden, P. H.;
O'Neill, N. R.;
Momen, B. |
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| Author Affiliation: | Kaminski: Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, Maryland; Dernoeden: Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, Maryland; O'Neill: USDA-ARS, Beltsville, Maryland; Momen: Department of Natural Resource Sciences and Landscape Architecture, University of Maryland, College Park, Maryland |
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| Title: | Reactivation of bentgrass dead spot and growth, pseudothecia production, and ascospore germination of Ophiosphaerella agrostis |
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| Source: | Plant Disease. Vol. 86, No. 12, December 2002, p. 1290-1296. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 7 |
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| Keywords: | TIC Keywords: Ophiosphaerella agrostis; Fall spot of bentgrass; Agrostis stolonifera; Winter dormancy; Temperatures; Festuca arundinacea; Light; Germination
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| Abstract/Contents: | "Ophiosphaerella agrostis incites bentgrass dead spot (BDS) of creeping bentgrass. Little is known about the biology of O. agrostis; hence the primary goal of this study was to determine some basic biological properties of the pathogen and epidemiological components of the disease. Winter-dormant creeping bentgrass field samples showing symptoms of BDS were incubated at temperatures ranging from 15 to 30° C. Between 12 and 28 days of incubation, reactivation of BDS symptoms occurred at temperatures ≥ 20 ° C, but the greatest expansion in BDS patch diameter occured at 25 and 30° C. The optimum temperatures for growth of hyphae among 10 O. agrostis isolates ranged from 25 to 30° C, and growth was supressed at 35° C. Pseudothecia of O. agrostis were produced in vitro on a mixture of tall fescue seed and wheat bran. Pseudothecia developed under constant fluroscent light at 13 to 28° C, but no pseudothecia developed in darkness at any temperature. Pseudothecia developed in as few as 4 days, but the highest numbers appeared about 30 days after incubation began. Ascospores incubated at 25° C germinated in as little as 2 h, with germ tubes generally emerging from the terminal rather than interior cells of ascospores. Germination during the first 4 h of incubation was enhanced by both light and the presence of bentgrass leaves or roots. After 18 h of incubation, however, there were few differences in the percentage of ascospores germinated regardless of light treatment or presence of plant tissue. |
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| Language: | English |
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| References: | 20 |
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| Note: | Pictures, b/w
Figures
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Kaminski, J. E., P. H. Dernoeden, N. R. O'Neill, and B. Momen. 2002. Reactivation of bentgrass dead spot and growth, pseudothecia production, and ascospore germination of Ophiosphaerella agrostis. Plant Dis. 86(12):p. 1290-1296. |
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| Web URL(s):
http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PDIS.2002.86.12.1290
Last checked: 08/26/2010
Requires: PDF Reader |
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MSU catalog number: SB 599 .P95 |
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