T. T. Zhao

First Report of Powdery Mildew Caused by Golovinomyces orontii on Common Poppy in Korea

In Korea, common poppy (Papaver rhoeas L.; Papaveraceae) was introduced in the 1990s and has been widely planted for ornamental purposes. In June 2013, the common poppies planted in the shady corner of a garden in Iksan, Korea, were found infected by a powdery mildew. The same symptoms were found on common poppies in several additional localities of Iksan and Hongcheon, Korea, in 2014. Voucher specimens were deposited in the Korea University Herbarium (KUS-F27314, F27322, F27839, F27930, and F27951). Symptoms began as circular to irregular white patches with or without purplish-brown discoloration of the lesion, which subsequently showed abundant hyphal growth on both sides of the leaves and stems, causing premature senescence. Appressoria on the mycelium were nipple-shaped. Conidiophores were arising laterally from hyphal mother cells, 120 to 250 × 10 to 12 μm, and produced 2 to 4 immature conidia in chains with a sinuate outline. Foot-cells of conidiophores were 42 to 85 μm long and characterized by the...

Taxonomy of the Golovinomyces cynoglossi Complex (Erysiphales, Ascomycota) Disentangled by Phylogenetic Analyses and Reassessments of Morphological Traits

Abstract The name Golovinomyces cynoglossi s. lat. is traditionally applied to a complex of morphologically similar powdery mildews on hosts of the plant family Boraginaceae. The current species-level taxonomy within this complex is ambiguous due to the lack of phylogenetic examinations. The present study applied phylogenetic methods to clarify the taxonomy of G. cynoglossi s. lat. Phylogenetic analysis of rDNA ITS sequences retrieved from Asian, European and North American specimens revealed that G. cynoglossi s. lat. collections from different hosts involved several species in five clearly separated lineages. Clade I consists primarily of Golovinomyces cynoglossi s. str. on Cynoglossum. Clade III consists of Golovinomyces sequences retrieved from the host genera Symphytum and Pulmonaria. The taxa within clade III are now assigned to G. asperifoliorum comb. nov. Clade V encompasses G. cynoglossi s. lat. on the host genera Bothriospermum, Buglossoides, Echium, Myosotis, and Trigonotis. The taxa within clade V are now assigned to G. asperifolii comb. nov. The species concerned in this study were lecto- and epitypified to stabilize their nomenclature.