Kamtschatka rose rust-Phragmidium kamtschatkae

Numerous rust fungi occur on Rosa especially in Asia and Europe. This rust attacks a variety of species of Rosa and has been reported in the Middle East and northern Europe and thus is considered a potential threat to the North American rose industry.

Phragmidium kamtschatkae (H.W. Anderson) Arthur & Cummins 1933

Spermogonia epiphyllous (on upper surface of leaves), numerous, punctate, irregularly and closely aggregated or scattered, minute, at first honey yellow, then reddish brown.

Telia amphigenous (on both surfaces of leaves), or on stipules, densely developed over entire leaf surfaces, early exposed, confluent, somewhat pulverulent, reddish brown, ruptured epidermis conspicuous; teliospores broadly ellipsoid or oblong to oblong-ellipsoid, 2- (rarely 3-) celled, 30-50 × 16-35 µm, rounded at apex, rounded or somewhat attenuated at base, slightly constricted at septum, 2 or 3 germ pores in each cell, walls 2-3.5 µm, pale yellow-brown, with 3 to 5 rows of warts; pedicels persistent, very short.

See Hiratsuka et al. (1975) and Wei (1988) for a more detailed description.

Host range: Rosa acicularis, R. chinensis (Bengal rose, China rose), R. davurica, R. majalis (cinnamon rose, May rose), R. marretii, R. moschata (musk rose), R. pimpinellifolia (burnet rose, Scotch rose), R. rugosa (Japanese rose, rugosa rose, Turkestan rose), and R. webbiana as well as Rosa spp.

Geographic distribution: Most frequently reported from Far East Asia (China, Japan, Korea, Pakistan, Taiwan) but also known from Central Asia (Afghanistan, Pakistan) and most recently from Europe (Finland, Norway and Russia).

Notes: The numerous species of Phragmidium that occur on Rosa are difficult to distinguish. Wei (1988) provides a key to those species known from China that includes many also common in North America. Phragmidium kamtschatkae is distinct in having two-celled teliospores.

References:

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

Henderson, D.M., and Jorstad, I. 1966. Studies in the flora of Afghanistan 2. Uredinales. Arbok Univ. Bergen, Mat.-Naturvitensk. Ser. 4: 1-18.

Hylander, N., Jorstad, I., and Nannfeldt, J.A. 1953. Enumerato Uredinearum Scandinavicarum. Opera Bot. 1: 1-102.

Jorstad, I. 1952. Parasitic fungi, chiefly Uredineae, from Tirich Mir in the state of Chitral, N. Pakistan. Nytt Mag. Bot. 1: 71-87.

Wei, S.X. 1988. A taxonomic study of the genus Phragmidium of China. Mycosystema 1: 179-210.

Zhuang, W.-Y., Ed. 2005. Fungi of northwestern China. Mycotaxon, Ltd., Ithaca, NY, 430 pages.

Nomenclature

Specimens in BPI

Additional distribution data

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