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| Web URL(s): | http://archive.lib.msu.edu/tic/rpr/1999/72294,%20Kansas%20State,%20Tisserat.PDF
Last checked: 02/22/2013
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Material Type: | Manuscript |
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| Monographic Author(s): | Tisserat, Ned; Fry, Jack; Keeley, Steve; Huang, Bingru |
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| Author Affiliation: | Tisserat: Principal Investigator, Department of Plant Pathology; Fry, Keeley, and Huang: Principal Investigator, Division of Horticulture, Trockmorton Plant Science Center, Kansas State University, Manhattan, KS |
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| Monograph Title: | The Biology and Management of Spring Dead Spot in Bermudagrass: [1999 Annual Report], [1999]. |
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| Publishing Information: | Manhattan, Kansas: Throckmorton Plant Science Center, Kansas State University |
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| # of Pages: | 4 |
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| Collation: | 2-5 pp. |
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| Abstract/Contents: | "Spring dead spot (SDS) is a serious disease of bermudagrass along the northern range of its adaption in the USA. Three distinct root-rotting fungi called Ophiosphaerella heripotricha, O. korrae, and narmari (formerly Leptosphaeria korrae and L. narmari) cause this disease. The purpose of our research is to learn more about the distribution and biology of these SDS pathogens, and based on this understanding, to develop more effective strategies for managing this disease. Diseased bermudagrass stolons and roots were sampled from golf courses in Kansas Oklahoma, Mississippi, Alabama, Virginia and Kentucky. O. Herpotricha and . korrae were recovered from samples in all states, with . herpotricha being more abundant in the Great Plains region and O. korrae more abundant in the eastern United States. O. narmari, previously reported only in Australia, was detected for the first time in North America from samples collected in Oklahoma and Kansas. Little is known about the population structure of SDS pathogens on a local and regional scale. We studied the inter- and intra-specific genetic diversity of Ophiosphaerella isolates from north America and Australia. The population of O. herpotricha at a given location appears to be a mixture of many different individuals. In contrast, just a few distinct clones dominate the population of O. korrae in a location. Field and greenhouse studies are being conducted to evaluate the resistance of seed and vegetatively propagated bermudagrass selections to spring dead spot. Field trials in Oklahoma indicated that several bermudagrass entries including Guymon, Sundevil, Midlawn, Midfield, Ft. Reno, and Mirage and OKS 91-11 were more resistant to spring dead spot. We are currently developing greenhouse and laboratory methods to more rapidly screen bermudagrass selections for disease resistance. Furthermore, we are determining whether there are differences in pathogenicity to bermudagrass selections among the three SDS pathogens. Preliminary evidence suggests that O. herpotricha results in large dead spots and more shoot kill within the spots than the other spring dead spot pathogens. Various cultural and chemical control strategies have been proposed to control spring dead spot. We established a trial 1998 to evaluate the effects of some of these control recommendations, alone and in combination, for suppression of SDS. Preliminary results indicate that aggressive summer aerification accompanied by fungicide and growth regulator treatments will reduce, but not eliminate symptoms of spring dead spot." |
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| Language: | English |
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| References: | 0 |
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| See Also: | See also related summary article, "The biology and management of spring dead spot in bermudagrass", 1999 Turfgrass and Environmental Research Summary [USGA], 1999, p. 15-16, R=72294. R=72294 |
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| Note: | "Abstract from Executive Summary for 1998" |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
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Last checked: 02/22/2013
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