Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

First report of Pectobacterium aroidearum causing soft rot of Amorphophallus konjac in China.

Abstract

Konjac (Amorphophallus konjac) is an important cash crop in southwest China, grown as a source of glucomannan for industrial use. In July 2019, symptoms of stem soft rot were observed on A. konjac in Kunming, Yunnan, China. Symptoms included stem soft rot with a foul smell, inner part of plant disintegration, and wilting of leaves. Twenty-five to 30% of the plants in the field were damaged. The causal pathogen was isolated and identified as Pectobacterium aroidearum based on morphological characteristics, molecular data (sequence analysis of 16S ribosomal DNA and phylogenetic analysis) and pathogenicity tests. This is thought to be the first report of soft rot caused by P. aroidearum on A. konjac in China, which expanded the known host range for this pathogen.