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Gymnosporangium sabinae

species

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Gymnosporangium sabinae (also Gymnosporangium fuscum and other names) (pear rust, European pear rust, or pear trellis rust) is a fungal heteroecious plant pathogen with Juniperus (juniper trees and shrubs) as the primary (telial) host and only Pyrus (pear trees) as secondary (aecial) hosts. It is one of many types of rust fungi affecting plants. Like many rust diseases, G. sabinae requires two different hosts to complete its life cycle from year to year. Juniper is the winter host and pear is the most common summer host. Spores (called aeciospores) are produced from the fungal lantern-shaped growths which protrude from the blisters on the underside of the pear leaf which become airborne and infect junipers. This fungus overwinters in swellings or galls on infected twigs and branches of…

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