Erysiphe tectonae
Erysiphe tectonae (E.S. Salmon) U. Braun & S. Takam.Schlechtendalia 4: 24, 2000.
Basionym: Uncinula tectonae E.S. Salmon., Ann. Mycol. 5: 479, 1907.
Mycelium epiphyllous, thin, effuse or confluent, forming patches, persistent. Hyphae 3–8μm wide. Hyphal appressoria lobed to multilobed, solitary or in opposite pairs. Conidiophores 60- 90μm long, erect, arising from the upper surface of the mother cells. Foot cells 30–40 × 9.5–12 mm, cylindrical to somewhat curved-sinuous, width somewhat increasing from below to above, followed by 1–2 shorter cells, forming conidia singly. Conidia 30–38 × 15–19μm, ellipsoidovoid to subcylindrical. Conidial appressoria lobate to multilobate (Pseudoidium-type). Sexual morph: Undetermined.
Material examined: On Tectona grandis L. f. (Verbenaceae), THAILAND, Chiang Mai, Suthep, 28 Dec 2013, J. Meeboon, TSU-MUMH1489, GenBank accession number: LC175811; Kanchanaburi Province, Huay Mae Khamin Waterfall, Si Sanat, 22 Feb 2014, J. Meeboon, TSU-MUMH5753.
Notes: The phylogenetic tree clearly showed that powdery mildew on T. grandis conforms with E. tectonae as it nested with E. tectonae on T. grandis from Indonesia (MUMH3228) with 100% BS support. Braun and Cook (2012) reported E. tectonae on T. grandis from Asia (India and Myanmar). This is the first record of E. tectonae from Thailand.
Figure X. Erysiphe tectonae on Tectona grandis. A: Conidia with germ tubes. B: Conidiophores. C: Appressoria. Bar: 20μm.
Reference: Meeboon J, Takamatsu S. (2017) New records of Erysiphe sect. Uncinula spp.(Erysiphales) from Thailand and E. liquidambaris var. acalycinae var. nov. Mycoscience 58:236–241.
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