Rose Mosaic Virus Growing Roses in Iowa Rose mosaic Rose mosaic , caused by a virus, is found worldwide.
Symptoms vary, but usually show up as mosaic patterns or splotches of yellow and green on leaves.
Flowers may be mottled in color, a condition called flower breaking. Leaf and flower symptoms may detract from the overall quality of the plant. Infected plants may be more sensitive to winter injury. This is because growing conditions change from year to year for roses. Plant health, weather, varieties and other factors all can contribute to virus symptoms.