Rose Rosette Disease: Identification and Management

Recognizing Rose Rosette Virus

When a single Knock Out rose in a group shows excessive thorniness, deep red pigmentation on new canes, distorted narrow leaves, and malformed buds—while neighboring plants look healthy—rose rosette disease (RRD) is the likely cause.

Cause and Spread

RRD is caused by a virus transmitted by microscopic eriophyid mites. These wind-borne mites move easily between plants. Once infected, a rose cannot be cured.

Immediate Actions

• Remove and destroy the infected plant entirely—roots and all. Do not compost.
• Bag debris to prevent mite spread.
• Monitor nearby roses weekly for early symptoms.
• Consider removing multiflora roses nearby, as they harbor mites.

No Chemical Cure

Miticides like bifenthrin may reduce mite populations but cannot eliminate the virus from an infected plant. Early removal is the only effective control.

For detailed information, visit the American Rose Society's Rose Rosette resource page.