Rust on Roses
How to treat rust on roses. Orange rose rust disease is not a common rose disease but it is serious because it is often fatal. Roses and rust prevention. Rose rust disease organic control.
Plant Health: Bayer All in One Rose & Flower Care 32 oz
Inspect your roses periodically for orange dots on the undersides of the leaves. They will usually appear in midsummer. Orange rust on rose plants will also cause the new shoots to turn red and wither.
In late summer the orange dots will turn black.
Roses are made vulnerable to rose rust by being potash deficient and by cold spring weather after a hard winter.
Rose Rust Control
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As with other rose diseases prevention is the best control. Choose rust resistant rose varieties whenever you can. Maintain proper spacing between plants so that air can circulate around the foliage and avoid wetting the leaves unnecessarily.
Treat any plant that has had rust in the past with one of the following products in early spring. If you use the spray, be sure to get it on the undersides of the leaves.
Green Light is the product I recommend for rose rust disease organic control. It is an excellent value because it will also control black spot, powdery mildew and anthracnose.
If you don't want an organic product, I recommend the Bayer All in One Rose and Flower Care Concentrate. This is also a multi-purpose product which will control rust, black spot and powdery mildew.
You dilute it in water and drench the soil with it. The rose takes it up and is protected from the inside.
Never use a systemic fungicide or insecticide on a rose from which you intend to harvest hips for use in herbal remedies or whose flower petals you intend to use to decorate cakes.
Powdery Mildew on Roses
Powdery mildew on roses appears as a white powdery mold on the leaves and buds. After contracting powdery mildew roses will drop their leaves prematurely. Take precautions to prevent rose mildew from spreading to your fruit trees.
Rose Rosette Disease
Downy Mildew on Roses