© 2008 Plant Management Network.
Coleosporium telekiae, a New Member of the Norwegian Rust Flora
Halvor B. Gjærum, Lars Semb, and Venche Talgø, Norwegian Institute for Agricultural and Environmental Research, Plant Health and Plant Protection Division, Høgskoleveien 7, 1432 Ås, Norway
Corresponding author: Venche Talgø. email@example.com
Gjærum, H. B., Semb, L., and Talgø, V. 2008. Coleosporium telekiae, a new member of the Norwegian rust flora. Online. Plant Health Progress doi:10.1094/PHP-2008-1006-01-BR.
In 2006, a rust was found on a 20-year-old ornamental perennial Telekia speciosa Schreb. [syn. Buphthalmum speciosum [Schreb.] Baumg.] (Asteraceae) in Ås, Akershus Co., Norway. Later that year the rust was found at a second location in Ås. The rust developed again on these plants in 2007 plus on plants at four new locations in Ås and one in Oppegård in the same county. Diseased plants exhibited chlorotic spots on the upper leaf surface and uredinia and telia on the lower side of the leaf (Fig. 1).
Uredinia were hypophyllous, 0.5 mm in diameter, often confluent, initially covered by the epidermis, but later naked (Fig. 2). Urediniospores in mass were first yellow orange, later white. Individual urediniospores were subgloboid or ellipsoid, 18-28 × 16-22 μm, walls 1-μm thick, hyaline, and densely verrucose (Fig. 3). Telia were hypophyllous, scattered to confluent, orange, wax-like crusts that measured 0.3 to 0.5 mm in diameter (Fig. 4). Teliospores were cylindric or somewhat attenuated at the base with rounded ends, (30-)45-95 × 15-27(-31) μm. Teliospore walls were 1-μm thick at the base and sides, but apically thickened up to 23 μm. The morphological characteristics of the fungus were consistent with the description of Coleosporium telekiae Thüm. except that the telia were more orange-coloured and had slightly shorter teliospores than reported by Gäumann (3) and Kuprevich and Uljanishchev (7).
C. telekiae Thüm., published in Fg. austr. No. 850, 1873, has been recognized as a variety of C. sonchi (F. Strauss) Tul. by Saccardo (10) and as C. inulae Rabenh. [as C. inulae (Kunze) E. Fisch. var. telekiae Thüm.] by Constantineau (1). C. sonchi and C. inulae are both often recognized as belonging to C. tussilaginis (Pers.) Berk. s. lat. (8).
This is the first report of C. telekiae in Norway. It has been reported from Austria (2), Bulgaria (4,9), Czech Republic (3), Hungary (3), Latvia (11), Poland (3), Romania (3), Russia (3), Slovakia (6,13), Turkey (5), and Ukraine (12).
The authors are indebted to Dr. Chr. Scheuer, Karl-Franzens-Universität, Graz, Austria, Dr. Petr Koke, Vykov, Czeck Republic, Dr. Per Sunding, University of Oslo (Botanical Museum), Norway, and Inger Halvorsen and Elisabeth Stensrud at our institute, for help with actual literature.
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