news — Gymnosporangium juniperi-virginianae

Cedar Apple Rust On Juniper Bonsai

Posted by Andrew Youtz on

Cedar Apple Rust On Juniper Bonsai

Cedar Apple Rust is caused by Gymnosporangium juniperi-virginianae, a plant pathogen/fungus that primarily effects apple and juniper related species.  This is a pretty interesting fungal disease that I have have been battling since getting into bonsai.  Early in my bonsai experience my love for junipers is what first exposed me to cedar apple rust.  I commonly purchased San Jose, Hollywood and other garden variety junipers from random local nurseries.  Many of these I found were very susceptible to cedar apple rust. Cedar apple rust has a pretty interesting 2 year life cycle.  One year apples and crab apples carry it.  The apple trees then release spores...

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