Melampsora medusae

Melampsora medusae is a fungal pathogen, causing a disease of woody plants. The infected trees' leaves turn yellowish-orange. The disease affects mostly conifers, e.g. the Douglas-fir, western larch, tamarack, ponderosa, and lodgepole pine trees, but also some broadleaves, e.g. trembling aspen and poplars. Coniferous hosts are affected in late spring through early August, and trembling aspens and poplars from early summer to late fall. It is one of only two foliage rusts that occur naturally in British Columbia.[1]

Melampsora medusae
Spores of Melampsora medusae on Populus deltoides
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Pucciniomycetes
Order: Pucciniales
Family: Melampsoraceae
Genus: Melampsora
Species:
M. medusae
Binomial name
Melampsora medusae
Thüm., (1878)
Synonyms

Melampsora albertensis Arthur, (1906)
Uredo medusae (Thüm.) Arthur, (1906)

Life cycle

Symptoms usually are contained to a single year on conifers, shedding the affected needles in fall. To survive the winter Melampsora medusae remain as teliospores on the dead leaves of the host, coming back in the spring to be spread by the wind as basidiospores, and infecting new conifers. After about two weeks, aeciospores are produced on the coniferous needles. Those spores serve as inoculum for an infection in live trembling aspen and other poplar trees in another two weeks. Urediniospores are produced on the poplar leaves, where the infection spreads. Winter then comes, and the cycle begins again.

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References
  1. "Melampsora Foliage Rusts." 30 January 2007. Melampsora medusæ. Archived 2007-08-16 at the Wayback Machine Canadian Forest Service. Retrieved on 9 September 2007.

Bibliography
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  • OEPP/EPPO (1982) Data sheets on quarantine organisms No. 33, Melampsora medusae. Bulletin OEPP/EPPO Bulletin 12 (1).
  • OEPP/EPPO (1990) Specific quarantine requirements. EPPO Technical Documents No. 1008.
  • Pinon, J. (1986) Situation de Melampsora medusae en Europe. Bulletin OEPP/EPPO Bulletin 16, 547-551.
  • Prakash, C.S.; Heather, W.A. (1985) Adaption of Melampsora medusae to increasing temperature and light intensities on a clone of Populus deltoides. Canadian Journal of Botany 64, 834-841.
  • Prakash, C.S.; Heather, W.A. (1989) Inheritance of partial resistance to two races of leaf rust Melampsora medusae in eastern cottonwood, Populus deltoides. Silvae Genetica 38, 90-94.
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  • Spiers, A.G.; Hopcroft, D.H. (1988) Penetration and infection of poplar leaves by urediniospores of Melampsora larici-populina and Melampsora medusae. New Zealand Journal of Botany 26, 101-111.
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