First report of blight on Pinellia ternata (Banxia) caused by Choanephora cucurbitarum in China.
Pinellia ternata is a perennial herbaceous plant native to China, Japan, and Korea. It is considered an invasive weed in parts of Europe and North America. In August 2020, P. ternata plants showing blight symptoms (8% incidence in a 30-ha field) were observed, near Qianjiang City, Hubei Province, China. Brown water-soaked lesions first appeared on flowers, followed by flower blight and leaf and stem rot during periods of more than 80% humidity. White, cottony mycelia grew from rotted tissues and produced sporangiophores with brown to black sporangiola. The causal pathogen was isolated and identified as Choanephora cucurbitarum based on morphological characteristics, nucleotide sequence analysis, and pathogenicity test. This is thought to be the first report of Choanephora blight caused by C. cucurbitarum on P. ternata in China and worldwide.