Check your roses regularly and deadhead any spent blooms and trim any broken or damaged canes. Examine the leaves for signs of insect damage or disease. Remove all the trimmed material from the garden. Leaving it under the roses bushes just gives the insects and diseases a place to get a foothold.. Rose mosaic symptoms Photo: Rachel Ross, University of Maryland. Symptoms of rose mosaic may appear as irregular yellow or white lines, bands, ring spots, or blotches on the foliage. Rose mosaic disease may be caused by different types of viruses including Apple Mosaic Virus (AMV) and Prunus Necrotic Ringspot Virus (PNRV).

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Rose Mosaic Virus. Rose Mosaic is a viral disease. The symptoms are varied but often include yellow (chlorotic) line patterns, yellowing that occurs in circles (ringspots), or irregular areas of yellow and dark green tissue, giving a mottled appearance. Stunted plant growth also may occur.. 4 A Guide to Roses Diseases and their Management Most plant diseases are caused by fungi or water molds. Both commonly produce wind-borne spores, which can be thought of as very small seeds. Figure 2B, shows spores of the pathogen Diplocar-pon rosae that causes the disease "black spot." The spores are in a water droplet.