The New Report of Root Rot on Fatsia japonica Caused by Phytophthora nicotianae in China

As an ornamental plant, Fatsia japonica has been widely used in gardens. From April 2021 to 2022, a disease that caused the wilting and root rot of F. large area was observed, which eventually led plants dying, while leaves did not fall off. This greatly reduced landscape effect plants. An oomycete species isolated from roots infected colony morphology slightly radial stellate, aerial mycelium flocculent. Oval sporangia with papillae, apical chlamydospores zoospores formed were observed. The morphological characteristics consistent Phytophthora. For accurate identification, internal transcribed spacer (ITS), cytochrome oxidase subunit II (COXII) ribosomal (LSU) genes amplified sequenced. identified as Phytophthora nicotianae using phylogenetic analysis. Finally, reproduced by inoculating healthy zoospore suspension; symptoms those natural infections, isolate obtained artificially had same inoculated isolate. results demonstrated P. is pathogenic factor rot. japonica. first report on China.