Because of no adverse effect on flowering, most people leave the plants alone and ignore the virus. Disease Controls Most rose diseases can be controlled or prevented with simple maintenance or cultural practices. Fungicides are necessary only in severe cases. Buy and transplant disease-free plants. Choose resistant varieties.
Varieties are available with resistance to powder mildew, blackspot and many other diseases.
Avoid wounding plants during transplanting. Plant roses in areas with good soil drainage and ventilation. Avoid shady spots and dense plantings. This will improve air circulation so that leaf surfaces will dry faster, preventing disease infection. Remove and destroy infected leaves and canes during the season.