UC Cooperative Extension Ventura County
669 County Square Dr. Suite 100
Ventura CA 93003
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There are eleven known viruses that infect roses. And since all roses are propagated vegetatively (rootstocks, buds, cuttings), the viruses are propagated with the plant parts. Several of the eleven viruses can be devastating to roses, causing plants to be stunted, having deformed leaves, shoots and flowers, and/or fail to bloom. Companies that grow and propagate roses are aware of these devastating viruses and have instituted virus certification programs to rid their stock plants of most of them. However, some viruses do not appear to reduce growth and flower production, so are not so rigorously culled from propagation fields. These are the ones that are causing the symptoms.