Ortho Concentrated Liquid Disease Control 16 ozCure listed diseases and continue to protect your roses and flowers from disease for up to 4 weeks with the Ortho Rose & Flower Disease Control Concentrate (Not for sale in NY). The systemic fungicide works through the leafs and stems to protect the entire plant, including any new growth. Because the formula controls and protects the plant from the inside out, it cannot be washed off by rain once its dried. Controls and prevents black spot, rust,