Asian Mountain Rubus rust - Phragmidium assamense

This rust attacks species of Rubus native to northern India and high elevations in China. None of these host species appear to be economically important nor closely related to the economically important berries. Thus, this rust does not appear to be a threat to the North American industry.

Phragmidium assamense Syd. & P. Syd. 1912

Uredinia hypophyllous, scattered or in small groups, minute, round, yellow, pulverulent, 0.4 mm diam; paraphyses clavate, erect or incurved, hyaline; urediniospores globose, broadly ellipsoid to obovoid, 17-23 × 14-20 µm; walls 1-1.5 µm thick, coarsely echinulate, pale yellow.

Telia hypophyllous, scattered or gregarious, minute, round, 0.7-2.5 mm diam, pulverulent, black; teliospores cylindrical, 3-9-, mostly 6-celled, 40-116 × 25-42 µm, rounded at apex, more or less constricted at septum, walls 2.5-5 µm, orange brown to blackish brown, somewhat verrucose, 2-3 germ pores in each cell; pedicels hyaline, persistent, 100-144 µm long.

See Wei (1988) for a more detailed description.

Host range: Species in Rubus subgenus Idaeobatus, specifically Rubus coreanus, R. flosculosus, R. idaeopsis, R. lasiostylus, R. mesgaeus, R. niveus, Rubus spp.

Geographic distribution: China, India (Assam)

References:

Kakishima, M., Ono, Y., Wahyuno, D., Zhou, X., and Zang, M. 2002. Rust fungi of Phragmidium (Uredinales) from Yunnan Province, China, collected in 1998. Bull. Natl. Sci. Mus., Tokyo, B. 28: 11-18.

Sydow, P., Sydow, H., and Butler, E.J. 1912. Fungi Indiae Orientalis. Ann. Mycol. 10: 243-280.

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

Zhang, N., Zhuang, J.-Y., and Wei, S.-X. 1997. Fungal flora of the Daba Mountains: Uredinales. Mycotaxon 61: 49-79.

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. Asian Mountain Rubus rust - Phragmidium assamense. Retrieved November 21, 2009, from http://nt.ars-grin.gov/sbmlweb/fungi/index.cfm .