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Taiwan Rubus rust - Phragmidium formosanum This rust attacks species of Rubus native to Asia. None of these host species are economically important nor are they closely related to species of economic importance. Thus, this rust species does not appear to be a threat to North American berry crops. Phragmidium formosanum Hirats. f. 1935 Uredinia hypophyllous (on lower surface of leaves), scattered or loosely grouped, minute, early exposed, somewhat pulverulent, pale yellow; paraphyses numerous, cylindrical or clavate, 30-50 × 8-12 µm, incurved, walls smooth, hyaline, 1-1.5 µm thick; urediniospores irregularly globose, obovate to ellipsoid, 16-33 × 10-16 µm, minutely echinulate, hyaline, walls 1.5 µm thick. Telia hypophyllous, scattered, minute, early exposed, 0.1-0.2 mm diam, pulverulent, black; teliospores cylindrical, 3-5 celled, 34-102 × 18-27 µm, slightly attenuated at base, more or less constricted at septa, with a pale brown projecting papilla at apex, chestnut brown or yellowish brown; pedicels hyaline, up to 47 µm long. See Wei (1988) for a more detailed description. Host range: Rubus subgenus Idaeobatus, specifically R. glanduloscalycina, R. hirsutopungens, R. parvipungens, R. pungens. Geographic distribution: Asia (China, Japan, Taiwan) Numerous species of Phragmidium infect species of Rubus native to Asia. These rust fungi are difficult to distinguish (Wei, 1988). References: Ito, S. 1950. Mycological Flora of Japan. Vol. II. Basidiomycetes. No. 3. Uredinales -- Pucciniaceae. Uredinales Imperfecti. Yokendo Ltd., Tokyo, 435 pages. Wei, S.X. 1988. A taxonomic study of the genus Phragmidium of China. Mycosystema 1: 179-210.
Suggested citation: Yun, H.Y. Systematic Mycology and Microbiology Laboratory, ARS, USDA. . Invasive Fungi. Taiwan Rubus rust - Phragmidium formosanum. Retrieved November 21, 2009, from http://nt.ars-grin.gov/sbmlweb/fungi/index.cfm .
Systematic Mycology and Microbiology Laboratory
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