Invasive Species Compendium

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Abstract

Occurrence of powdery mildew caused by Pseudoidium neolycopersici on papaya (Carica papaya) in China.

Abstract

In late March 2017, symptoms of powdery mildew were observed on 80% of pawpaw (Carica papaya) plants that were grown at the campus of Fujian Agriculture and Forestry University, Fuzhou, China. The initial symptoms of powdery mildew on pawpaw appeared as circular to irregular white colonies on both sides of leaves. As the disease progressed, the leaves became covered with white mass of fungal colonies. Eventually, leaves showed chlorosis and necrosis followed by desiccation and rapid senescence. The causal pathogen was isolated and identified as Pseudoidium neolycopersici based on morphological, molecular and pathogenicity analyses. The obtained ITS sequence was deposited in GenBank (accession no. KY887788). This is thought to be the first report of pawpaw powdery mildew caused by P. neolycopersici in mainland China.