apple rust


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Noun1.apple rust - rust fungus causing rust spots on apples and pears etcapple rust - rust fungus causing rust spots on apples and pears etc
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
References in periodicals archive ?
* Hawthorns with a more severe case of cedar apple rust may have foliage that turns bright yellow and drops prematurely.
Only an average keeper, this cider apple variety is moderately susceptible to common apple diseases--especially collar rot--but somewhat resistant to fire blight and cedar apple rust.
Crabapples, like eating apples, are generally susceptible to fire blight, powdery mildew, cedar apple rust and scab diseases.
Also, some varieties have been developed that are resistant to some of the common disease problems, apple scab, fire blight, and cedar apple rust. Because this information is usually not available on fruit trees sold in big box stores, ordering from nurseries by catalog or online is a better way of buying trees.
I have identified apple rust on crab trees, blueberry rust on blueberry bushes and even some sort of round ulcer on the more than 100-year-old ivy.