Full TGIF Record # 148795
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Web URL(s):http://www.turf.uconn.edu/pdf/research/reports/2008.pdf#page=111
    Last checked: 06/08/2009
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Putman, A. I.; Kaminski, J. E.
Author Affiliation:Department of Plant Science and Landscape Architecture, University of Connecticut, Storrs, Connecticut
Title:Geographic distribution of fungicide-insensitive Sclerotinia homoeocarpa in New England
Section:Scientific publications (abstracts & citations)
Other records with the "Scientific publications (abstracts & citations)" Section
Source:2008 Turfgrass Research Report [Connecticut]. 2009, p. 108.
# of Pages:1
Publishing Information:Storrs, CT: Department of Plant Science, University of Connecticut
Keywords:TIC Keywords: Disease control; Dollar spot; Fungicide resistance; Geographical distribution; Sclerotinia homoeocarpa
Abstract/Contents:"Repeated applications of fungicides used to control dollar spot (Sclerotinia homeocarpa F.T. Bennett) in turf may lead to the selection of strains with reduced fungicide sensitivity. The objective of this study is to determine the scope of S. homoeocarpa insensitivity to fungicides commonly used to control dollar spot of golf courses in New England. In 2007, 1,104 isolates of S. homeoecarpa was collected from 22 populations on 18 golf courses in southern New England. Additional isolates (n=408) were obtained from 205 golf courses in New England and New York. Isolates were evaluated in vitro for their sensitivity to oprodione, propiconazole, and thiophanate-methyl. Relative growths of baseline and a random sampling isolates were determined using probit analysis to determine the concentration resulting in 50% growth inhibition (EC50). For thiophanate-methyl, isolates were grown at a single concentration and scored for the presence or absence of growth. The mean sensitivity of the baseline population to iprodione and propiconazole was 0.2985^D+-0.0335 and 0.0016^D+-0.0007 μg a.i. mL-1, respectively. All baseline isolates were sensitive to thiophanate-methyl. Discriminatory concentrations developed from the random population were 0.01 and 0.04 μg a.i. mL-1 for propiconazole and iprodione, respectively. Sensitivities of isolates to propiconazole and iprodione were estimated using growth at these single discriminatory concentrations (ED50(D)). Mean EC50(D) values of isolates evaluated to date(n = 266) ranged from 0.0009 to 0.1938 for propiconazole and from 0.2167 to 0.8289 for iprodione. For thiophanate-methyl, 169 isolates from three populations (100%) were sensitive, 82 isolates from two populations (100%) were resistant, and 47% of isolates from a sixth population (n = 15) were resistant. Preliminary results of indicate that S. Homoeocarpa insensitivity to select dollar spot fungicides is present in varying degrees in New England."
Note:This item is an abstract only!
Geographic Terms:New England
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Putman, A. I., and J. E. Kaminski. 2009. Geographic distribution of fungicide-insensitive Sclerotinia homoeocarpa in New England. 2008 Turfgrass Res. Rep. [CT]. p. 108.
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    Last checked: 06/08/2009
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    Notes: Item is within a single large file
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MSU catalog number: b5428823~S39a
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