Hiratsuka Rubus rust - Phragmidium hiratsukanum

Most hosts of this rust are species of Rubus native to Asia, thus this pathogen is not considered a threat to the North American berry industry.

Phragmidium hiratsukanum S.X. Wei 1988

Uredinia hypophyllous (on lower surface of leaves), scattered or in small groups, minute, irregularly round, early exposed, pale yellow, pulverulent; paraphyses clavate, 35-50 × 8-12 µm, suberect or incurved, wall hyaline; urediniospores subglobose, obovate or broadly ellipsoidal, 18-25 × 10-17 µm; walls 1-1.5 µm thick, minutely echinulate, hyaline.

Telia hypophyllous, scattered or gregarious, minute, round or irregular in shape, pulverulent, black; teliospores oblong-cylindrical, 3-4 celled, 40-60 × 21-27 µm, rounded at apex, not constricted at septum, walls 4-6 µm, olive-brown, minutely and closely verrucose, without apical papilla, with 3 germ pores in each cell; pedicels hyaline, persistent, up to 60 µm long, hyaline.

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

Host range: Species in Rubus subgenus Ideaobatus, specifically R. euphlebophyllus, R. fraxinifolius, R. glandulosopuntatus, R. palmatus, P. parvariaraliifolius, R. taiwanianus

Geographic distribution: Asia (China, Japan, Taiwan)

Notes: This species has most commonly been known as P. rubi-fraxinifolii but that name has been determined to apply only to the anamorph.

Nomenclature

Specimens in BPI

Additional distribution data

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