First report of Choanephora cucurbitarum causing Choanephora blight on Phlox paniculata in Korea.
From August to September 2014, Choanephora blight was found with approximately 20-30% incidence on flowers of Phlox paniculata in 2 botanical gardens in Siheung and Yeoju, Korea Republic. Initially, water-soaked lesions developed on the flowers and then downward into the calyces, which converted into a soft rot. Later, infected tissue was covered with white mycelia and sporangiola. No symptoms were found on the stems and leaves. The causal pathogen was identified as Choanephora cucurbitarum based on morphological, genetic (ITS) and pathogenicity analyes. This is thought to be the first report of C. cucurbitarum on P. paniculata in Korea Republic and the world.