A rust fungus newly found on nursery daylilies in the U.S.
Name: Puccinia hemerocallidis
Fungi: Basidiomycota: Urediniomycetes: Uredinales: Pucciniaceae
Common Names: daylily rust
Pathways: Daylily producers often develop varieties in the U. S. and send those to Costa Rica and other tropical areas for propagation. The daylilies are then shipped back to U. S. nurseries in the spring and early summer. The infected plants found in GA came from Costa Rica, but it is possible that the rust could have been introduced into the U. S. first, and then sent to Costa Rica. Most of the foliage is removed from the daylily tubers before shipment, making it difficult to detect the fungus at ports-of-entry. The tubers could be carrying rust spores, which are impossible to detect visually.
Hosts: Numerous daylily species (Hemerocallis spp.), Patrinia species (Patrinia spp.), and Hosta species (Hosta spp.).
Vector(s)/Dispersal: Dispersal of the rust fungus could occur by movement of the host plant as an ornamental, medicinal plant, or vegetable. Plant propagation by division may also aid in dispersal.
Quarantines: Daylily rust was mentioned by Stevenson in Foreign Plant Diseases in 1926, and therefore would probably be considered a pest of quarantine significance.
Phytosanitary Alert System
Pest Alert www.pestalert.org
Prepared on: 01/10/2002