Defoliation, dieback and mortality of Satsuma mandarin (Citrus unshiu), as well as kumquat (Fortunella margarita), in Chenggu County, Shaanxi Province, China was first noticed in 2006 and caused substantial economic losses to citrus production. The incidence of leaves infected approached 100% in some badly infected orchards. The disease prevailed only in late winter and early spring, where early symptoms were rounded and target-like spots on leaves. The disease was named target spot. Black conidiomata were observed on the upper surface of the leaves. A Cryptosporiopsis species was consistently recovered from the infected leaves, shoots, and branches. The name Cryptosporiopsis citricarpa sp. nov. is given to accommodate the fungal pathogen in this study.
Plant Disease, Volume 96, Issue 6, Page 804-812, June 2012.
By Li Zhu, Xinghong Wang, Feng Huang, Jinze Zhang, and Hongye Li, Institute of Biotechnology, Zhejiang University, China; Dekuan Ding, Citrus Institute of Chenggu County, and Kevin D. Hyde, Institute of Excellence in Fungal Research, Thailand; King Saud University, College of Science, Botany and Microbiology Department, Saudi Arabia