Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of powdery mildew caused by Podosphaera xanthii on Luffa cylindrica in Korea.

Abstract

In October 2014, several plants of L. cylindrica (L. aegyptiaca; sponge gourd or Egyptian cucumber) exhibiting symptoms of powdery mildew were observed in a garden in Seoul, Korea. Powdery mildew colonies were circular to irregular, forming white patches on both sides of the leaves. As the disease progressed, white mycelial growth covered entire leaves, causing premature senescence. Powdery mildew of sponge gourd had been collected in Jeju, Busan, Osan, and Anyang from 2005 to 2013. Based on morphological characteristics, sequence analysis of the rDNA internal transcribed spacer region and pathogenicity tests, the causal agent was identified as P. xanthii. Powdery mildew of L. cylindrica caused by Podosphaera species has been recorded in China, India, Malaysia, Myanmar, Egypt, Libya and Romania. This is thought to be the first report of powdery mildew caused by P. xanthii on L. cylindrica in Korea.