Invasive Species Compendium

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Abstract

First report of leaf spot of Cornus alba caused by Botryosphaeria dothidea in China.

Abstract

Cornus alba is widely cultivated as an important ornamental plant in China. In July 2018, a new leaf spot disease on C. alba was observed in Harbin, Heilongjiang province, China. Thirty plants were surveyed, which had 30-40% of leaves infected. Foliar symptoms began as small brown lesions, round or oval in shape. Subsequently, they developed into large irregular spots, brown to black, with a grey central area. At the end, lesions were densely distributed throughout the leaves. The causal pathogen was isolated and identified as Botryosphaeria dothidea based on morphological, molecular and pathogenicity analyses. The obtained DNA sequences were deposited in the GenBank (accession nos. MN318645 and MN072365, respectively). This is thought to be the first report of leaf spot on C. alba caused by B. dothidea in China.