Gymnosporangium juniperi-virginianae

Cedar apple rust

Photo by University of Georgia Plant Pathology Archive, Bugwood.org

  • Only infects apples and cedar (Juniperus virginiana), and requires both hosts to complete its life cycle
  • Infected fruit and leaves develop yellow-orange lesions on the surface and in some varieties spore-producing tufts also develop
  • Lesions are raised and can crack as the fruit enlarges
  • Stems may develop a slight swelling
  • Galls with finger-like projections are produced on cedar hosts
  • Spread with infected plant material or by wind dispersal

High priority pest of: Apples and pears

Scientific name: Gymnosporangium juniperi-virginianae
EPPRD Category:
Life Form: Fungus

Pest Documents

FS: fact sheet

CP: contingency plan

DP: diagnostic protocol