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Gymnosporangium clavariiforme

Juniper pear rust

Description

Gymnosporangium is a genus of heteroecious plantpathogenic fungi which alternately infect members of the family Cuprassaceae, primarily species in the genus Juniperus (junipers), and members of the family Rosaceae in the subfamily Maloideae (apples, pears, quinces, shadbush, hawthorns, rowans and their relatives). Gymnosporangium clavariiforme infects Juniperus in its telial stage, producing bright orange gelatinous 10 mm columns, and Crataegus (hawthorn) in its aecidium, growing 5 mm horn-like structures on leaves and fruits which disperse spores.

Symptom

Gymnosporangium clavariiforme infects Juniperus in its telial stage, producing bright orange gelatinous 10 mm columns, and Crataegus (hawthorn) in its aecidium, growing 5 mm horn-like structures on leaves and fruits which disperse spores.

Tree Species: Quince, Hawthorn

Part of a plant- attacked: Leaf / Needle

Pest significance: Harmful

Pest Category: Fungi

Invasive Species: No

Present in EU: Yes