First Report of Onion Rust Caused by Puccinia allii on Allium pskemense and A. altaicum

Plant Disease
S L LupienF M Dugan

Abstract

In June 2003, uredinial and telial pustules were seen on leaves of accession W6-12755 Allium pskemense B. Fedtsch. originating from Uzbekistan and grown for germplasm increase in Pullman, WA. W6-18947 A. altaicum Pall., originating from Mongolia, displayed similar symptoms in the same garden in June 2000. A. altaicum is a wild onion exploited for food in its native range and is ancestral to A. fistulosum L., bunching onion (2). A. pskemense is a wild perennial sometimes propagated under cultivation (2). Both species have been exploited for research in breeding and systematics of Allium and used to a lesser degree in screening for pest or disease resistance. Clustered, golden orange, amphigenous uredinia were approximately 1 × 0.5 mm and surrounded by stromatic, subepidermal, blackish telia of variable size. Urediniospores (thick-walled, pale orange, echinulate, (25-) 27 to 32 (-34) × (19-) 21 to 25 μm, with as many as 10 scattered, indistinct pores), teliospores (two-celled, smooth, golden brown, 42 to 65 × 18 to 26 μm), and mesospores (27 to 42 × 15 to 21 μm, and approximately 30% as frequent as teliospores) all approximated the description for P. allii Rudolphi (4), but were more strongly congruent with the description of Puc...Continue Reading

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