Gymnosporangium juniperi-virginianae

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Gymnosporangium juniperi-virginianae

[‚jim·nō·spə¦ran·jē·əm ‚jü·ni‚per·ē ‚vər‚jin·ē′a‚nī]
(mycology)
A heteroecious fungal pathogen that is the cause of apple-cedar rust.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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It's extremely resistant to apple scab, cedar apple rust, and fire blight and moderately resistant to powdery mildew.
Roxbury Russet' offers good resistance to apple scab and powdery mildew, and it's moderately susceptible to fire blight and cedar apple rust.