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Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2010.100.6.S1#page=102 Last checked: 11/24/2010 Requires: PDF Reader |
Publication Type:
| Report |
Content Type: | Abstract or Summary only |
Author(s): | Popko, J. T.;
Ok, C.;
McGrath, M. T.;
Jung, G. |
Author Affiliation: | Popko: Department of Plant, Soil and Insect Science, University of Massachusetts-Amherst, Hadley, MA; Ok and Jung: Department of Plant, Soil and Insect Science, University of Massachusetts-Amherst, Amherst, MA; McGrath: Department of Plant Pathology and Plant-Microbe Biology, Cornell University, Riverhead, NY |
Title: | Field efficacy of propiconazole on diverse Sclerotinia homeocarpa population structures |
Section: | 2010 APS Annual Meeting abstracts of presentations Other records with the "2010 APS Annual Meeting abstracts of presentations" Section
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Source: | Phytopathology. Vol. 100, No. 65, June supplement 2010, p. S102. |
Publishing Information: | St. Paul, MN: American Phytopathological Society |
# of Pages: | 1 |
Keywords: | TIC Keywords: Application rates; DMI fungicides; Dollar spot; Fungicide application; Fungicide evaluation; Propiconazole; Sclerotinia homoeocarpa
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Abstract/Contents: | "Dollar spot (Sclerotinia homoeocarpa) is a major turfgrass disease requiring fungicide application to maintain acceptable conditions for golf. Demethylation inhibitors (DMI) are the most frequently used fungicide class with confirmed resistance in S. homoeocarpa. Due to the quantitative nature of DMI resistance, a clear correlation between in vitro sensitivity values and reduced field efficacy has yet to be established for S. homoeocarpa. The study objective was to determine field efficacy of propiconazole rates on S. homoeocarpa populations with differing in vitro sensitivities. Prior to fungicide application, DMI sensitivity of populations on fairways of four golf courses and the UMass turf center was characterized by determining relative mycelium growth percentage (RMG%) on 0.1 μg a.i./ml propiconazole-amended medium. The UMass site consisted of a sensitive population (0-20% RMG) and the golf course sites consisted of two insensitive populations (50- 80% RMG) and two with discrete bimodal populations (0-40% and 60-90% RMG). S. homoeocarpa was completely controlled with all propiconazole rates at the UMass site for all but one rating date. Reduced efficacy was observed at all four golf course sites on multiple rating dates, and 90% of isolates sampled 7 and 14 days after DMI application had RMG values >60%. Results indicate isolates with >60% RMG are likely responsible for reduced" |
Language: | English |
References: | 0 |
Note: | This item is an abstract only! |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Popko, J. T., C. Ok, M. T. McGrath, and G. Jung. 2010. Field efficacy of propiconazole on diverse Sclerotinia homeocarpa population structures. Phytopathology. 100(65):p. S102. |
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| Web URL(s): http://apsjournals.apsnet.org/doi/pdf/10.1094/PHYTO.2010.100.6.S1#page=102 Last checked: 11/24/2010 Requires: PDF Reader |
| MSU catalog number: b2219736a |
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