Diseases on roses - 4 diseases

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The rose, the queen of flowers, can be found in almost every garden. And certainly there are diseases in every garden at the roses that infest these beautiful flowers.

If a rose is attacked by the black speck, the leaves turn black

A garden without roses is hard to imagine. It is all the more annoying when their beauty is destroyed by diseases. Especially the real mildew, the downy mildew, rose rust and star soot annoy hobby gardeners by making themselves spread on the roses. These are leaf diseases caused by a fungus. Surely you can do something to keep it from infestation, but sometimes it's too late for that. Then it only helps if you act quickly.

How to combat mildew and Co.

❖ Powdery mildew:

These mushrooms do not stop at a rose. If roses are affected by this fungus, then the shoots and the leaves are covered with a white coating. The leaves then turn brown, curl up and fall off. The fungus spreads rapidly especially in dry and warm weather in combination with nocturnal dew.


Affected areas should be immediately removed generously. Then mix one part of whole milk with eight parts of water, place in a spray bottle and spray the affected roses once a week with the mixture. The microorganisms in the milk then not only fight the fungus, they also help the rose build up a kind of resistance to the fungus.

Alternatively, spray the infested plant with garlic sauce (recipe here) or stinging nettle (recipe here). Also, be aware of more resistant varieties when planting.

❖ downy mildew:

The leaves on the top get reddish-brown spots. As a result, mold forms. Even with this disease, the leaves fall off. In addition, the buds often dry up.


First remove all affected parts of the plant. In particularly severe cases, it may even be advisable to remove the entire plant from the garden immediately. This will prevent fungal disease from spreading to other plants. Even with this powdery mildew, you can spray the roses again with a milk-water mixture. But it also helps a bouillon of field horsetail, which you have to spray every other day on the plant. Soak 1 kilogram of field horsetail in 10 liters of water for 24 hours and then boil for 30 minutes.

❖ Rose rust:

This disease manifests itself in red or yellow spots on the leaf tops. On the underside of the leaves, on the other hand, are the spore bearings. From this later, dark spores escape which are scattered by the wind and spread to other plants. In case of heavy infestation, the rose throws off its leaves.


Remove the infected foliage immediately. You can then sprinkle the roses every two days with field horsetail. Does not help, then you have to resort to a fungicide. Recommended is e.g. CELAFLOR Rose Mushroom-Free Saprol (available here, for example). Always follow the manufacturer's instructions when using.

❖ Star soot:

This fungal disease causes irregularly shaped gray-black spots on the leaves. In addition, the rose petal near the spots is always yellowish in color. If there is a heavy infestation, the roses even shed their leaves.


Remove all affected parts of the plant as well as the leaves that have already fallen off. The mushroom hibernates in the leaves on the ground and spreads further. Then you can sprinkle the roses with garlic or horseradish. Does not help, you must use a fungicide. Again, you can go back to CELAFLOR Rose Mushroom-free Saprol. But just as well COMPO Duaxo Rosen is mushroom-free (available here, for example). Again follow the manufacturer's instructions.

Important: Dispose of contaminated plant parts in the residual waste

Always dispose of the affected parts of the plant above the residual waste, as mushrooms can hibernate in the plant parts and continue to spread in the garden. Therefore, never put the affected parts on the compost. Also clean all garden tools and planters. It also applies to trellis, screens, etc.

Video Board: Black Spot Rose Disease – Treatment and Prevention.

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