Musk rose rust - Phragmidium rosae-moschatae

This rust attacks species of Rosa native to Asia. None of these host species are related to species of common ornamental roses, thus this rust species does not appear to be a threat to the North American rose industry.

Phragmidium rosae-moschatae Dietel 1905

Spermagonia epiphyllous in groups, minute.

Aecia hypophyllous, caeomoid, in groups, yellow; aeciospores subglobose, 17-29 × 14-22 µm, wall hyaline, echinulate, 1-2 µm thick.

Telia hypophyllous, scattered or gregarious, minute, round or irregular, 0.2-0.4 mm diam, pulverulent, black; teliospores cylindrical, 5-11 (mostly 5-7) celled, 57-147 × 22-43 µm, apex round with hyaline papilla up to 5 µm; wall chestnut brown, minutely and closely verrucose, 3-5 µm thick; 2-3 germ pores in each cell, pedicels hyaline, up to 60 µm long × 19 µm thick.

See Ragunathan & Ramakrishnan (1973) for a more detailed description.

Host range: Species of Rosa subfamily Rosoidae tribe Roseae, specifically R. bunonii, R. macrophylla, R. moschata (musk rose), R. webbiana.

Geographic distribution: Northern India and Pakistan

References:

Arthur, J.C., and Cummins, G.B. 1933. Rusts of the Northwest Himalayas. Mycologia 25: 397-406.

Jorstad, I. 1959. Notes on some Asiatic Uredinales. Nytt Mag. Bot. 7: 129-144.

Jorstad, I., and Iqbal, S.H. 1967. Uredinales from West Pakistan. Nytt Mag. Bot. 14: 31-38.

Ragunathan, A.N., and Ramakrishnan, K. 1973. Rust fungi of Madras State. VII. Kuehneola, Hamaspora, Phragmotelium, Phragmidium, Diorchidium, Ravenelia, Hapalophragmium and Nyssopsora. Mysore J. Agric. Sci. 7: 73-86.

Wahyuno, D., Kakishima, M., and Ono, Yoshitaka 2002. Aeciospore-surface structures of Phragmidium species parasitic on roses. Mycoscience 43: 159-167.

Nomenclature

Specimens in BPI

Additional distribution data

Suggested citation: Yun, H.Y. Systematic Mycology and Microbiology Laboratory, ARS, USDA. . Invasive Fungi. Musk rose rust - Phragmidium rosae-moschatae. Retrieved November 21, 2009, from http://nt.ars-grin.gov/sbmlweb/fungi/index.cfm .