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Occurrence and impact of a new leaf rust race on durum wheat in Northwestern Mexico from 2001 to 2003

Author: Singh, R.P.
Author: Huerta Espino, J.
Author: Pfeiffer, W.
Author: Figueroa López, P.
Year: 2004
ISSN: 0191-2917
ISSN: 1943-7692
Abstract: Durum wheat (Triticum turgidum var. durum) is the main irrigated winter crop in northwestern Mexico. Historically, leaf rust, caused by Puccinia triticina, had not induced significant losses to durum production in the area until 2001. That year, a new race, designated as BBG/BN, was detected that caused the most widely grown cultivar, Altar C84, which had remained resistant for 16 years, to become susceptible. Other recommended cultivars also became either moderately susceptible or susceptible. Detailed characterization of avirulence/virulence characteristics on Lr genes indicated that this race possibly did not evolve from the older races, but may have been introduced. Rust epidemics during the 2000-2001, 2001-2002, and 2002-2003 crop seasons have caused estimated losses of at least US$32 million. Although a majority of cultivars from 31 different countries, including the United States and Canada, and most of CIMMYT's durum wheat germ plasm were highly susceptible, diversity for both race-specific resistance and moderate levels of slow rusting resistance were identified. Jupare C2001, a resistant cultivar released in 2001, showed high levels of resistance and negligible losses in grain yield in a trial where Altar C84 suffered over 27% losses.
Format: PDF
Language: English
Publisher: American Phytopathological Society (APS)
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Country focus: Mexico
Region: North America
Pages: 703-708
Volume: 88
DOI: 10.1094/PDIS.2004.88.7.703
Keywords: Brown Rust
Agrovoc: RUSTS
Journal: Plant Disease

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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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