Phytophthora cathayensis sp. nov ., a new species pathogenic to Chinese Hickory ( Carya cathayensis ) in southeast China

Crown decline and mortality associated with collar lesions were observed on (Chinese hickory) trees in a plantation in Zhejiang province, China. Examination of active lesions resulted in the isolation of a homothallic, papillate sp. Detailed morphological and physiological studies and phylogenetic analysis, using ITS, beta-tubulin, cytochrome oxidase I, and heat shock protein 90 gene regions, revealed that all isolates belonged to an undescribed species residing in phylogenetic Clade 4, which is described here as . Inoculation trials were conducted under greenhouse conditions on and (pecan) plants to fulfill Koch postulates and hypothesize a possible pathway of the incursion. An existing report of a species with the same ITS sequence was reported on from the USA in 2009. The difference in susceptibility of the two inoculated species, and the report from the USA, suggest a possible introduction with plant material from the USA to China. Morales-Rodríguez C, Wang Y, Martignoni D, Vannini A (2020). , a new species pathogenic to Chinese Hickory ( ) in southeast China. 99-111. doi: 10.3114/fuse.2021.07.05.