First report of downy mildew caused by Pseudoperonospora cubensis on Luffa cylindrica in India.
From July to December in 2014 and 2015, several plants of Luffa cylindrica exhibiting yellow angular spots on upper side and greyish-to-black efflorescence on lower side of the leaves were observed in different cultivation fields of Odisha state in India. Infected leaves were collected from fields and the abaxial surface of the symptomatic portion was observed under the microscope. A fungus-like was consistently observed from symptomatic portion. Based on morphological characteristics, molecular data (sequence analysis of the internal transcribed spacer region of ribosomal DNA) and pathogenicity tests, the causal agent was identified as Pseudoperonospora cubensis. This is thought to be the first report of P. cubensis on L. cylindrica in India.