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| DOI: | 10.1094/PHYTO-95-1183 |
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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PHYTO-95-1183
Last checked: 08/25/2010
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Pratt, R. G. |
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| Author Affiliation: | United States Department of Agriculture - Agriculture Research Service, Waste Management & Forage Research Unit, Mississippi State, Mississippi |
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| Title: | Variation in occurence of dematiaceous hyphomycetes on forage bermudagrass over years, sampling times, and locations |
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| Section: | Ecology and epidemiology
Other records with the "Ecology and epidemiology" Section
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| Source: | Phytopathology. Vol. 95, No. 10, October 2005, p. 1183-1190. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 8 |
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| Keywords: | TIC Keywords: Cynodon dactylon; Forage crops; Bipolaris; Curvularia; Exserohilum; Pathogens; Disease evaluation
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| Abstract/Contents: | "Leaf samples of forage bermudagrass with symptoms of infection by species of Bipolaris, Curvularia, and Exserohilum (dematiaceous hyphomycetes) were collected from three swine waste application sites in Mississippi at eight sampling times during each of 3 years. Samples were assayed for pathogens by observing sporulation on plated leaf tissue. Among 3,600 leaves assayed, eight species of the three genera were observed. Features and criteria for the practical identification of species on plated leaf samples are described. Sporulation by dematiaceous hyphomycetes was observed on 97% of leaves, a single pathogen was observed on 20% and two to five pathogens were observed on 77% of leaves. Distributions of leaves among classes with one to five pathogens per leaf, for sites within years, always differed significantly (p = 0.01) from a Poisson distribution and usually inculded fewer leaves than expected with four or five pathogens. Significant (p = 0.05) variation in frequencies of occurance of pathogens among 72 samples of 50 leaves each was attributed to pathogen species, sampling times, and species-time interactions. Exserohilum rostratum, Curvularia lunata, and Bipolaris cynodontis were the most frequent pathogens across years and sites; B. spicifera and C. geniculata were intermediate; and B. hawaiiensis, B. sorokiniana, and B. stenospila were least frequent. For the five most common pathogens, significant differences in frequency among locations were commonplace. Six pathogens exhibited significant (p = 0.05) positive and negative correlations with others in overall frequencies of occurance across years, sampling times, and sites. However, Χ2 tests of dual occurance indicated that interactions between specific pairs of pathogens in or on leaves are not likely to be major causes for overall frequency correlations. Results indicate that dematiaceous hyphomycetes typically infect forage bermudagrass on swine waste application sites in complexes rather than as individual species; that E. rostratum, C. lunata, and B. cynodontis are the predominant pathogens; and that frequencies of pathogens often differ significantly between locations." |
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| Language: | English |
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| References: | 23 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Pratt, R. G. 2005. Variation in occurence of dematiaceous hyphomycetes on forage bermudagrass over years, sampling times, and locations. Phytopathology. 95(10):p. 1183-1190. |
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| DOI: 10.1094/PHYTO-95-1183 |
| Web URL(s):
http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PHYTO-95-1183
Last checked: 08/25/2010
Requires: PDF Reader |
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MSU catalog number: SB 599 .P48 |
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