Full TGIF Record # 215000
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Web URL(s):http://archive.lib.msu.edu/tic/rpr/2000/72115,%20Kansas%20State, Tisserat.PDF
    Last checked: 02/06/2013
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Publication Type:
Material Type:Manuscript
Monographic Author(s):Tisserat, Ned; Fry, Jack; Keeley, Steve; Huang, Bingru
Author Affiliation:Principal Investigator
Monograph Title:The Biology and Management of Spring Dead Spot in Burmudagrass: [Annual USGA Report], [2000].
# of Pages:8
Publishing Information:Manhattan, Kansas: Kansas State University, Department of Plant Pathology, Division of Horticulture
Collation:[8] pp.
Abstract/Contents:"Golf course superintendents managing bermudagrass in the middle United States commonly observe severe injury in spring as a result of spring dead spot disease (SDS). Currently, three root-rot fungi (Ophiosphaerella herpotricha, O. korrae, and Leptospaeria narmari) cause SDS in North America. One of these pathogens (L. narmari) was only identified in the U.S. within the last three years. Although some progress has been made in screening bermudagrass selections for SDS susceptibility and identifying cultural practices that predispose turf to injury, little headway has been made in developing an effective fungicide or IPM control program. This is partly because the biology of the fungi associated with SDS is poorly understood. As a result, SDS is one of the few diseases that largely remains unmanageable by the golf course superintendent. Our objective are to determine the distribution and abundance (frequency) of three pathogens that cause SDS in the U.S.; to develop reliable technique for screening bermudagrass selections for SDS resistance; and to develop an integrated approach to managing susceptible bermudagrass. To date we have determined that O. herpotricha is the most common cause of SDS in Oklahoma and Kansas whereas O. korrae is primarily associated with the disease in Mississippi, Alabama, North Carolina, Georgia, Tennessee and Virginia. Both pathogens are present in Kentucky. The population of O. korrae isolates from southern states also appears to be distinct from those collected in more nothern regions. O. narmari is rarely detected from SDS patches in the United States. In inoculation trials, isolates of O. herpotricha caused larger dead spots than either O. korrae or O. narmari. Seeded and vegetative selections of bermudagrass in the Oklahoma State University breeding program and the National Turfgrass Evaluation Program (NTEP) trials have been inoculated with isolates of the three SDS pathogens. Several seeded and vegetative bermudagrass selections have been identified with increased resistance to SDS. Cultural practices for SDS suppression were evaluated. In 1999, bermudagrass treated with the fungicide azoxystrobin plus the growth regulator trinexapac-ethyl had less SDS damage than turf in other treatments. Turf receiving triexapac-ethyl in combination with one or more cultural practices generally had better spring quality than turf that did not."
See Also:See also related summary article, "The biology and management of spring dead spot in bermudagrass", 2000 Turfgrass and Environmental Research Summary [USGA], 2000, p. 14, R=72115. R=72115
Also appears as pp. 656-636 in the USGA Turfgrass Research Committee Reporting Binders for 2000
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http://archive.lib.msu.edu/tic/rpr/2000/72115,%20Kansas%20State, Tisserat.PDF
    Last checked: 02/06/2013
    Requires: PDF Reader
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