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|a 10.1094/PDIS.2002.86.1.15
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|a eng
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|a Long, D L
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|a Virulence of Puccinia triticina on Wheat in the United States in 1999
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|c 2002
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|a Text
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|a ƒaComputermedien
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|a Date Revised 20.11.2019
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Isolates of Puccinia triticina were obtained from wheat leaf collections made by cooperators throughout the United States and from surveys of wheat fields and nurseries in the Great Plains, Ohio Valley, and Gulf Coast states in 1999. Pathogenic races were determined from virulence/avirulence phenotypes on 14 host lines that are near-isogenic for leaf rust resistance. We found 58 races among 1,180 isolates in 1999. As in previous surveys, regional race distribution patterns showed that the central United States is a single epidemiological unit distinct from the eastern United States. The distinctive racial composition of collections from the Southeast, Northeast, and Ohio Valley indicates that populations of P. triticina in those areas are not closely connected, suggesting epidemics originate from localized overwintering sources
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| 650 |
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|a Journal Article
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|a plant disease monitoring
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| 650 |
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|a rust epidemiology
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| 650 |
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|a wheat leaf rust
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| 700 |
1 |
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|a Leonard, K J
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|a Hughes, M E
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