''Gymnosporangium clavipes'' is a plant pathogen, a fungus that causes cedar-quince rust. Similar to ''

Gymnosporangium juniperi-virginianae ''Gymnosporangium juniperi-virginianae'' is a plant pathogen that causes cedar-apple rust. In virtually any location where apples or crabapples (''Malus'') and Eastern red cedar (''Juniperus virginiana'') coexist, cedar apple rust can be a destr ...

'' and ''

Gymnosporangium globosum ''Gymnosporangium globosum'' is a fungal plant pathogen that causes cedar-hawthorn rust. Hosts and symptoms ''Gymnosporangium globosum'' is a heteroecious rust fungus that requires two hosts to complete its life cycle. Its telial stage occurs on ...

'', the fungus infects a wide range of

Rosaceae Rosaceae (), the rose family, is a medium-sized family of flowering plants that includes 4,828 known species in 91 genera. The name is derived from the type genus ''Rosa''. Among the most species-rich genera are ''Alchemilla'' (270), ''Sorbus ...

, such as apple, hawthorn and quince trees, and also requires an evergreen host such as

eastern red cedar ''Juniperus virginiana'', also known as red cedar, eastern red cedar, Virginian juniper, eastern juniper, red juniper, and other local names, is a species of juniper native to eastern North America from southeastern Canada to the Gulf of Mexico a ...

or a number of other juniper species to complete its life cycle.James Schuster
Cedar-Quince Rust
Accessed July 16, 2008.

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Pucciniales Apple tree diseases Fruit tree diseases Fungal tree pathogens and diseases Galls Fungi described in 1873 {{fungus-tree-disease-stub