Asian Kuehneola rose rust - Kuehneola japonica

Species in the genus Rosa are susceptible to a number of rust fungi many of which occur in Asia. Japanese rose rust causes a serious disease of cultivated and native roses in Japan including R. multiflora, a species commonly used in rose breeding. The white to orange-red teliospores of K. japonica are quite unlike the dark brown teliospores of Phragmidium species that inflect roses in North America.

Kuehneola japonica (Dietel) Dietel 1912

Spermogonia, aecia and uredinia unknown.

Telia amphigenous, rounded or irregularly rounded, 0.2-1 mm diam, sori elongated on stems and leaves, exposed, compact, white to bright orange-red; teliospores in long-cuneated chains, 2-4 celled, clavate to cylndric-clavate, 50-110 µm long, each cell subglobose to ellipsoid, rounded at apex, 22-38 × 15-22 µm, walls hyaline, 1-1.5 µm thick, germ pore 1 in each cell, pedicels short.

See Hiratsuka et al. (1992) for a more detailed description.

Hosts: On various species of Rosa including Rosa banksiae W. T. Aiton., R. bracteata J. C. Wendl., R. chinensis Jacq., R. luciae Franch. & Rochebr. ex Crép., R. luciae var. fujisanensis Makino, R. luciae var. onoei (Makino) Momiy. ex Ohwi, R. laevigata Michx., R. multiflora Thunb., R. multiflora var. adenochaeta (Koidz.) Ohwi, R. × odorata (Andrews) Sweet, R. taiwanensis Nakai

Geographic distribution: Most commonly known from Japan (Kobayashi, 2007, Hokkaido, Honshu, Kyushu, Okinawa/Ryukyu Archipelago, Shikoku, Hiratsuka et al., 1992) but also reported from China (Fujian, Zhuang, 1983), Philippines (Arthur & Cummins, 1936) and Taiwan (Hiratsuka & Chen, 1991).

Notes: Kohno et al. (1977) observed the infection process of Kuehneola while Ono (2002) confirmed that K. japonica reproduces genetically homogeneous progenies based on observation of nuclear behavior.

References:

Arthur, J.C., and Cummins, G.B. 1936. Philippine rusts in the Clemens collection 1923-1926, II. Philipp. J. Sci. 61: 463-488.

Kohno, M., Ishizaki, H., and Kunoh, H. 1977. Cytological studies on rust fungi. (VI) Fine structures of infection process of Kuehneola japonica (Diet.) Dietel. . Mycopathologia 61: 35-41.

Ono, Y. 2002. Life cycle and nuclear behavior in three rust fungi (Uredinales). Mycoscience 43: 37-45.

Sawada, K. 1943. Descriptive catalogue of the Formosan fungi. Part IX. Rep. Dept. Agric. Gov. Res. Inst. Formosa 86: 1-178.

Zhuang, J.-Y. 1983. [A provisional list of Uredinales of Fujian Province, China.]. Acta Mycol. Sin. 2: 146-158.

Nomenclature

Specimens in BPI

Additional distribution data

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