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What is it? Wednesday

Rose Rosette Disease on Knock Out® Rose

Knock Knock Out® roses in Helen, GA. Vicky Bertagnolli ©2020, Clemson Extension

Knock Out® roses in Helen, GA.
Vicky Bertagnolli ©2020, Clemson Extension

Eriophyid mites Tracy Wootten, University of Delaware, Bugwood.org

Eriophyid mites
Tracy Wootten, University of Delaware, Bugwood.org

Fast Fact

Rose rosette disease (RRD) is caused by rose rosette virus (RRV). Rose rosette virus is transmitted by grafting or the feeding of eriophyid mites.

Symptoms

Symptoms of RRD are highly variable depending on rose species and cultivar.

  • Elongation of new shoots
  • Leaf reddening/mottling, distortion, and or stunting
  • Clustering of small branches (“witches’ broom”/”rosette”)
  • Excessive thorns that are initially soft and rubbery
  • Abnormally thick, succulent new growth
  • Flower buds may abort, be deformed, or converted to leaf-like tissue (phyllody)
  • Flowers may be distorted, discolored, or fail to open normally
  • Reduced plant hardiness/vigor

Treatment

There is no cure for rose rosette disease. Symptomatic roses should be removed and destroyed.

For more information, see HGIC 2109, Frequently Asked Questions About Rose Rosette Virus.

If this document didn’t answer your questions, please contact HGIC at hgic@clemson.edu or 1-888-656-9988.

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