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| Web URL(s): | http://apsjournals.apsnet.org/doi/pdf/10.1094/PDIS.2003.87.9.1043
Last checked: 01/04/2008
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Alderman, Steve C.;
Barker, Reed E. |
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| Author Affiliation: | United States Department of Agriculture - Agricultural Research Service, National Forage Seed Production Research Center, Corvallis, Oregon |
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| Title: | Evaluation of resistance to ergot, caused by Claviceps Purpurea, in Kentucky bluegrass, based on incidence and severity estimates |
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| Source: | Plant Disease. Vol. 87, No. 9, September 2003, p. 1043-1047. |
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| Publishing Information: | St. Paul, MN: American Phytopathological Society |
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| # of Pages: | 5 |
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| Keywords: | TIC Keywords: Ergot; Disease resistance; Claviceps purpurea; Poa pratensis; Disease incidence; Disease severity; Cultivar evaluation; Cultivars
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| Abstract/Contents: | "Ergot, caused by Claviceps purpurea, is an important disease of Kentucky bluegrass grown for seed. Resistance is a preferred means of disease control, although approaches to evaluating ergot resistance in Kentucky bluegrass are not well established. A large scale disease assessment trial was established to compare within-year and year-to-year variability among measures of ergot incidence or severity; on Kentucky bluegrass and to determine the most efficient approaches for cultivar evaluation. The susceptibility of 104 Kentucky bluegrass cultivars (78 commercial and 26 experimental) to ergot was assessed, based on percentage of panicles with sclerotia (incidence), sclerotia per panicle (severtiy), percentage of seeds replaced by sclerotia, or percentage of sclerotia among seed by weight. Cultivar ranking for susceptibility within years was similiar for all methods of ergot assessment. Yearly, mean incidence of ergot among cultivars ranged from 1.0 to 97.5% for susceptible cv. HV102 to 0.0 to 2.5% for resistant cv. Huntsville, with remaining cultivars distributed between the extremes. Yearly mean values of ergot incidence and severity differed among years. Much: of this variablity was due to days with rain during the period from flower initiation to maturity (period of susceptiblity). Disease incidence was correlated (Pā¤0.05) with days with rain in 22 of the cultivars. Duration of flowering was correlated (Pā¤0.05) with ergot incidence in 11 cultivars. Results from this study suggest that variability in host and environment would likely offset any gain in precision of severity data. In large trials in particular, collection of incidence data (percentage of panicles with ergot) would provide the most timely and efficient means for ergot assessment." |
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| Language: | English |
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| References: | 14 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Alderman, S. C., and R. E. Barker. 2003. Evaluation of resistance to ergot, caused by Claviceps Purpurea, in Kentucky bluegrass, based on incidence and severity estimates. Plant Dis. 87(9):p. 1043-1047. |
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| Web URL(s):
http://apsjournals.apsnet.org/doi/pdf/10.1094/PDIS.2003.87.9.1043
Last checked: 01/04/2008
Requires: PDF Reader |
| 
MSU catalog number: SB 599 .P95 |
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