Addition to Erysiphe quercicola, A Powdery Mildew Fungus on Urena lobata in South China

Leaves of Caesar weed (Urena lobata) with typical powdery mildew symptoms were collected from Baiyun Mountain Park in Guangzhou, China during winter and summer in 2020 and 2021. Based on the morphology and molecular sequence analyses of Internal Transcribed Spacer (ITS) and large subunit (LSU) rDNA region, the causative agent was identified as Erysiphe quercicola. A description and relevant microscopic images of the pathogen are provided. According to our knowledge, this is the first report of E. quercicola on Urena lobata and this study expands the host range of E. quercicola. Further, we provided details of life cycle and geographical distribution of the fungus.

Automated summary

Through morphology and molecular sequence analysis, this study identified the causative agent of powdery mildew symptoms on Urena lobata plants in Baiyun Mountain Park, Guangzhou, China as Erysiphe quercicola. A description and microscopic images of the pathogen were provided. This is the first report of E. quercicola on Urena lobata, expanding its host range, and the study also provided details on the fungus's life cycle and geographical distribution.