The disease produces urediniospores, other types of spores are unknown
to this disease, and it either over winters as urediniospores or as
Mycelium on old leaves within plant tissue.
This disease has been little seen for many years but has re-emerged
again recently. Consequently recommended treatments are for old
fungicides like Bordeaux mixture and copper fungicides.
It would be worth trying
modern fungicides used against Chrysanthemum White Rust as these were
not available when Chrysanthemum Rust was prevalent.
Hot water treatment has
been found to have some affect in its control.