Cedar-apple rust is a fungus disease of apple and cedar and spends parts of its life cycle on each host. It is caused by Gymnosporangium juniperi-virginianae. The fungus can infect leaves and fruit of most cultivars in the eastern region. This table lists juniper, hawthorn, and crab apple cultivars with resistance to rust diseases.
|Juniperus (Juniper)||Crataegus (Hawthorn)||Malus (Crab Apple)|
|Cedar-apple and hawthorn rust resistant||Cedar hawthorn rust resistant||Cedar hawthorn rust resistant|
|J. ashei||C. crus-galli||‘Adams’|