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Melita from Murray, Utah writes

Will Monterey Fungi-Fighter treat white stuff on rose leaves?

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.

Answer:

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

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