Full TGIF Record # 149097
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DOI:10.1094/PHYTO.2009.99.6.S1
Web URL(s):http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2009.99.6.S1#page=129
    Last checked: 06/11/2009
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Tredway, L. P.; Soika, M. D.; Butler, E. L.
Author Affiliation:North Carolina State University, Raleigh, North Carolina
Title:Response of spring dead spot caused by Ophiosphaerella korrae and O. herpotricha to fertilization programs and preventive fungicide applications
Section:Abstracts submitted for presentation at the 2009 APS annual meeting
Other records with the "Abstracts submitted for presentation at the 2009 APS annual meeting" Section
Meeting Info.:Portland, Oregon: August 1-5, 2009
Source:Phytopathology. Vol. 99, No. 6, June Supplement 2009, p. S129.
Publishing Information:St. Paul, MN: American Phytopathological Society
# of Pages:1
Keywords:TIC Keywords: Ammonium sulfate; Cynodon dactylon; Fertilization program; Fungicide application; Inoculation; Ophiosphaerella herpotricha; Ophiosphaerella korrae; Spring dead spot; Sulfur-coated urea
Cultivar Names:Tifway
Abstract/Contents:"Field studies were conducted in Raleigh, NC on 'Tifway' bermudagrass that was artificially inoculated with the spring dead spot (SDS) pathogens Ophiosphaerella korrae (OK) and O. herpotricha (OH). Inoculation was performed in Oct 2005 using rye grain infested with each species. Fertilization and preventive fungicide treatments were applied in 2006 and 2007, and SDS symptoms induced by each species were evaluated in 2007 and 2008. Nitrogen source significantly impacted SDS development, but OH and OK responded differently. Ammonium sulfate and sulfur-coated urea suppressed OH as compared to calcium nitrate and urea. On the other hand, calcium nitrate significantly suppressed OK when compared to urea, ammonium sulfate, and sulfur coated urea. Fall applications of potassium chloride, dolomitic lime, gypsum, or elemental sulfur exhibited no effect on either SDS pathogen. Preventive applications of azoxystrobin + propiconazole, fenarimol, myclobutanil, or tebuconazole provided effective control of both species in 2007 and 2008. Propiconazole provided significant control only in 2007, and azoxystrobin did not suppress SDS in either year. While OH and OK were controlled effectively by several fungicides, these species responded very differently to nitrogen sources. Further research is needed to clarify the mechanisms by which SDS is influenced by nitrogen source. Fall applications of potassium and other nutrients may not be beneficial in the spring dead spot management."
Language:English
References:0
Note:This item is an abstract only!
"2009 APS Annual Meeting"
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Tredway, L. P., M. D. Soika, and E. L. Butler. 2009. Response of spring dead spot caused by Ophiosphaerella korrae and O. herpotricha to fertilization programs and preventive fungicide applications. Phytopathology. 99(6):p. S129.
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DOI: 10.1094/PHYTO.2009.99.6.S1
Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2009.99.6.S1#page=129
    Last checked: 06/11/2009
    Requires: PDF Reader
    Notes: Item is within a single large file
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MSU catalog number: b2219736a
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