Invasive Species Compendium

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Abstract

First report of powdery mildew caused by Blumeria graminis f. sp. bromi on Bromus catharticus in China.

Abstract

Rescue grass (Bromus catharticus) is a brome grass that has been cultivated for herbage production and has been widely naturalized in many provinces of China, including Henan province. During April and May 2020, powdery mildew was found on leaves of Bromus catharticus on the campus of Henan Normal University, Xinxiang city, Henan Province, China. Abundant white or grayish irregular or coalesced circular powdery colonies were scattered on the adaxial surface of leaves, and 70% of the leaf areas were affected. Some of the infected leaves were either chlorotic or senescent. About 60% of the observed plants showed powdery mildew symptoms. The causal pathogen was isolated and identified as Blumeria graminis f.sp. bromi based on morphological, molecular and pathogenicity analyses. The obtained sequence (574 bp) was deposited in GenBank under accession number MT892940. This is thought to be the first report of Blumeria graminis f.sp. bromi on Bromus catharticus in China.