Cercosporoid leaf pathogens from whorled milkweed and spineless safflower in California.
Two cercosporoid species are respectively described from Mexican whorled milkweed (Asclepias fascicularis), and spineless safflower (Carthamus tinctorius) from California. Passalora californica represents a new pathogen on Asclepias fascicularis, while Ramularia cynarae is confirmed on Carthamus tinctorius and Cynara cardunculus (Asteraceae), and an epitype designated. Pathogenicity is also established for both pathogens based on Koch's postulate.
University of California Cooperative Extension, Salinas 93901;
Steven T
ST
Koike
Aziz
A
Baameur
Johannes Z
JZ
Groenewald
Pedro W
PW
Crous