ce·dar-ap·ple rust

(sē′dər-ăp′əl)

A disease caused by a rust fungus (Gymnosporangium juniperi-virginianae) that spends part of its life cycle on certain junipers, causing galls and twig dieback, and the remainder of its life cycle on susceptible apples or crabapples, causing yellow spots and early shedding of leaves or fruit.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

cedar-apple rust - rust fungus causing rust spots on apples and pears etc

apple rust, Gymnosporangium juniperi-virginianae

rust fungus, rust - any of various fungi causing rust disease in plants

genus Gymnosporangium, Gymnosporangium - genus of fungi that produce galls on cedars and other conifers of genera Juniperus and Libocedrus and causes rust spots on apples and pears and other plants of family Rosaceae

Mentioned in

References in periodicals archive

Resistance to diseases such as scab, cedar-apple rust and fire blight needs to be considered.

Several varieties of crabapple provide winter fruit for birds

Black spot is showing up on roses, mildew is everywhere, anthracnose can be expected to disfigure sycamores, apple scab and cedar-apple rust have made their appearance and are spreading.

Fungi invaders are landing everywhere

'Toba' and 'Snowbird' are the most commonly available cultivars as they were once thought to be resistant to the Gymnosporangium rust diseases such as hawthorn-juniper gall rust and cedar-apple rust. Unfortunately ornamental hawthorn trees are dying throughout southern Manitoba especially from the hawthorn-juniper gall rust.

The Rosaceae family

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