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Citeable URL: http://ir.library.oregonstate.edu/concern/articles/vd66w1897

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Attribute Name	Values
Creator	Walenta, Darrin L. Hamm, Philip B. Dung, Jeremiah K. S. Alderman, Stephen C.
Abstract or Summary	Ergot, caused by Claviceps purpurea, is a major disease of perennial ryegrass grown for seed in eastern Oregon. The objective of this research was to quantify and describe the spatial patterns of ergot severity in each of three 50-ha commercial fields of perennial ryegrass grown for seed in 2012 and 2013. In total, 1,433 and 1,405 quadrats were sampled among the three fields in 2012 and 2013, respectively, and the percentage of quadrats with ergot ranged from 59 to 90%. The mean incidence of infected seed heads in each quadrat ranged between 13 and 29%, while mean severity in each quadrat ranged from 0.2 to 0.5 sclerotia per seed head. Significant autocorrelation and clustering were observed in all three fields in both years, as indicated by Moran’s I and spatial analysis by distance indices of aggregation. The mean number of ergot sclerotia collected from each field after harvest ranged between 4 and 15 sclerotia m⁻² in 2012 and 18 and 119 sclerotia m⁻² in 2013. Sclerotia left in perennial fields after harvest are a significant source of inoculum that should be targeted for control. This is the first study to quantify spatial patterns of ergot in perennial ryegrass and provides insights into possible mechanisms that contribute to ergot etiology and epidemiology.
Resource Type	Article
DOI	10.1094/PDIS-08-14-0787-RE
Date Available	2016-06-21T14:23:44+00:00
Date Issued	2016-06
Citation	Dung, J. K., Alderman, S. C., Walenta, D. L., & Hamm, P. B. (2016). Spatial Patterns of Ergot and Quantification of Sclerotia in Perennial Ryegrass Seed Fields in Eastern Oregon. Plant Disease, 100(6), 1110-1117. doi:10.1094/PDIS-08-14-0787-RE
Series	Vol. 100 no. 6 Plant Disease
Rights Statement	Copyright Not Evaluated
Funding Statement (additional comments about funding)	Funding for this research was provided by the Columbia Basin Grass Seed Growers Association, Columbia River Seeds LLC, DLF International Seeds, the Oregon Seed Council, Simplot Soil Builders, the United States Department of Agriculture, the Union County Seed Growers Association, the Washington State Commission on Pesticide Registration, and the Washington Turf Grass Seed Commission.
Publisher	American Phytopathological Society
Peer Reviewed	Yes
Language	English [eng]
Replaces	http://hdl.handle.net/1957/59265
Additional Information	description.provenance : Made available in DSpace on 2016-06-21T14:23:44Z (GMT). No. of bitstreams: 1DungSpatialPatternsErgot.pdf: 875957 bytes, checksum: 948c75f522b0d39a2aacf5f96097ddbd (MD5) Previous issue date: 2016-06 description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2016-06-21T14:23:44Z (GMT) No. of bitstreams: 1DungSpatialPatternsErgot.pdf: 875957 bytes, checksum: 948c75f522b0d39a2aacf5f96097ddbd (MD5) description.provenance : Submitted by Patricia Black (patricia.black@oregonstate.edu) on 2016-06-21T14:23:09ZNo. of bitstreams: 1DungSpatialPatternsErgot.pdf: 875957 bytes, checksum: 948c75f522b0d39a2aacf5f96097ddbd (MD5)

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