Rose rosette disease is affecting rose bushes, causing strong cane growth and an abundance of sharp thorns. A key symptom of the disease is the unusual growth pattern.

Complete removal of the affected plant is the only known defense against the disease. Trimming a dying branch from the rose bush is not sufficient to stop the disease.

Further information on rose rosette disease and its effects on rose bushes is available from the source, which describes the symptoms and necessary actions to take.