The florist's chrysanthemum (Dendranthema x grandifolium) is the most important commercial host, but several other species of chrysanthemum are also susceptible.
Chrysanthemum white rust is a quarantine significant pest. Importation of chrysanthemums from several countries is prohibited due to potential transport of the pathogen with host material.
Chrysanthemum white rust originated in Asia, and is not found in Australia, Africa, Europe, and Central and South America. The pathogen has been detected in limited outbreaks in Canada and the U.S. and is eradicated when found.