UC Cooperative Extension Ventura County
669 County Square Dr. Suite 100
Ventura CA 93003
Our offices are currently closed due to the COVID-19 pandemic, and our team is telecommuting from home. We are available via phone and email.
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Rust on Roses
Rose rust is caused by a fungus that infests the leaves of roses and causes the symptoms. Rose rust will cause defoliation of your rose bush and if the leaf drop is severe, it will in time affect the vigor of the bush and flower production.