Gymnosporangium rust
a disease caused by species of the genus Gymnosporangium and a few species in the closely related genera Roestelia and Uredo having telial hosts in the Cupressaceae and aecial hosts usually in the Rosaceae —note Gymnosporangium rust causes economic damage to pomaceous crops and to ornamental cedars and junipers —synonym stem rust —see aecium This definition last updated 10/27/2008