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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/1990/24855, Texas A&M, Colbaugh.PDF
Last checked: 03/22/2013
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Colbaugh, Phillip F. |
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| Author Affiliation: | Principal Investigator and Associate Professor and Plant Pathologist |
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| Monograph Title: | Developing Brown Patch and Pythium Disease Resistance in Bentgrass and Zoysiagrass: Fourth Annual Progress Report, 1990. |
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| Publishing Information: | Dallas, Texas: Texas Agricultural Experiment Station-Dallas, Texas A&M University System |
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| # of Pages: | 32 |
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| Collation: | [1], ii, 29 pp. |
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| Abstract/Contents: | "Techniques for handling and inoculating large numbers of bentgrass field samples are being used to identify resistance to Pythium and Rhizoctonia blight diseases. Large culture collections of both pathogens have assisted in the use of highly virulent strains of the fungi for disease screening. Previous inoculation studies with bentgrass genotypes obtained from the GPIN (germplasm introduction nursery), HTS (heat treatment selection nursery), NHTS (not heat treated selection nursery) and the elite bentgrass nursery have examined Pythium foliar blight resistance among members of the collections. Repeated inoculation studies with the standard variety Penncross demonstrated improved Pythium resistance among several members of the experimental bentgrass germplasm collections. Of 1203 germplasm lines screened during 1989, 6% demonstrated resistance to Pythium foliar blight. Unusually wet weather during the spring allowed research investigations to focus on field evaluations of Pythium blight symptoms in field nurseries. Disease symptoms were observed in June on two field nurseries following lengthy environmental periods favoring maximum disease pressure. Typical visual symptoms of foliar thinning and decline were observed on 15.4% of the NHTS plots and 29.4% of the HTS plots. Disease symptoms appeared to be greater on germplasm lines from Prominent than on other parental lines observed in both nurseries. Greenhouse studies were used to correlate disease symptoms from the HTS nursery field plots with a seedling bioassay for Pythium blight in McDonald's sundae cups. Blighting of seedling stands in cups produced by soil cores from field plots was greater in cups than on the field plots. Of test expervars showing field resistance (less than 25%) 41% were substantiated by seedling blight data. These results indicate the importance of obtaining field plot visual data to identify sources of resistance to Pythium blight. Rhizoctonia spp. inoculation studies on germplasm lines from HTS and NHTS field nursery plots showing field resistance to Pythium blight did not show a high level of resistance to both diseases. Of 105 Pythium resistant germplasm lines examined 11 demonstrated potential resistance to both Pythium and Rhizoctonia blight diseases. The USGA Turfgrass Rhizoctonia culture collection has also made valuable contributions in the area of developing refined techniques for tissue culture selection of new germplasm lines. Cooperative research is now underway with Dr. Jeff Krans to screen bentgrass originating from tissue culture lines against Rhizoctonia blight using mass inoculating screening methods. Isolates of fungi causing the Helminthosporium diseases and Sclerotinia dollar spot are being collected and samples will be greatfully received from any sources available during the year. The isolates will be [will be] maintained in long-term storage as with other USGA isolate collections and will be used for a variety of disease screening and pathogen identification studies." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related summary article, "Developing rhizoctonia brown patch and pythium disease resistance in bentgrass and zoysiagrass", 1990 Annual Turfgrass Research Report [USGA/GCSAA], 1990, p. 25, R=24855. R=24855 |
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| Note: | Includes index; p. [1]
"Jointly Sponsored By: United States Golf Association and Texas Agricultural Experiment Station"
"1 November 1990"
"Fourth Annual Progress Report 1990"
"Reserach Period of this report: 1 May 1990 to 1 Nov. 1990"
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Last checked: 03/22/2013
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