Erysiphe deutziae causing powdery mildew on Deutzia parviflora var. amurensis in China

Abstract

Deutzia parviflora var. amurensis is a common ornamental shrub in the Hydrangeaceae. In July and September 2017, powdery mildew infections were first noticed on this shrub in Yichun, China. Powdery mildew colonies on leaves and nonlignified stems were conspicuous, especially when the plants were growing in shade. Based on morphological characteristics and sequencing of the nuclear ribosomal internal transcribed spacer (ITS) region, the pathogen was identified as Erysiphe deutziae. To our knowledge, this is the first report of powdery mildew caused by E. deutziae on Deutzia parviflora var. amurensis in China.

Erysiphe deutziicola sp. nov. (Erysiphaceae, Ascomycota), a powdery mildew species found on Deutzia parviflora (Hydrangeaceae) with unusual appendages

“…Later, this powdery mildew was introduced to Europe with records from France, Germany, Poland and Switzerland (Bolay et al 2005) and the UK (Denton and Henricot 2007). In recent years, this pathogen was also reported on Deutzia in Korea (Park et al 2010) and China (Nguyen et al 2018).…”

“…Genome DNA was extracted using chasmothecia of HMJAU-PM91860 and conidia and mycelia from the asexual specimen HMJAU-PM91861 by the Chelex-100 method (Walsh et al 1991; Hirata and Takamatsu 1996). Two specimens of Erysiphedeutziae on Deutziaparvifloravar.amurensis (Nguyen et al 2018) were also used for the DNA extraction and amplification, since 28S rDNA sequences of E.deutziae were not yet available in GenBank. The DNA amplification and sequencing were conducted according to the procedure described by Qiu et al (2018).…”