Melita from Murray, Utah writes
Just wondering if this products I needed for my roses. I begin to see some some white gray stuff on the leaves of the rose plant.
You may have a disease called powdery mildew on the roses. Monterey Fungi-Fighter can be used to treat this disease, as can most other common fungicides. Per the product label, use 1 tablespoon (0.5 oz) per gallon of water. Thorough coverage is needed for best results. Apply at bud break and then every 10 days.
Answer last updated on: 05/22/2016