Rose Bush Diseases

Rose Diseases such as Black Spot on Roses; Powdery Mildew; Rust on Roses

diseased rose bushRose Bush with Fungal Disease

Dealing with Rose Bush Diseases such as Black Spot on roses, and other fungal diseases such as powdery mildew and rust are considered common place when growing roses.

The following Four rose bush diseases are THE most common.

You can lesson the problem with these rose fungal diseases in a number of ways:

  • Purchase and plant roses that are resistant to Black spot and other fungal diseases of roses. Disease Resistant Varieties are your best line of defense!
  • Keep in mind that rose plants with glossy leaves are less prone to fungal disease, because the waxy coating on the leaves makes it hard for the fungal spores to take hold.
  • Never water the rose bushes from above, always water at ground level, and try not to splash water on the plant leaves. (wet leaves are more apt to get fungal infections) Damp, moist conditions have the most trouble.
  • Provide the bush with a nourishing environment to grow in, but go easy on the nitrogen fertilizer-excess nitrogen will promote weak, soft growth that is prone to disease.
  • Make sure the plant has plenty of air circulation (Open up the middle of the bush by thinning out some of those canes in the center) Proper pruning helps to prevent fungal problems.
  • To help prevent these types of rose bush diseases, be sure the rose plant gets lots of sun

Recognizing Fungal Diseases of Roses

The most prevalent problems with rose plants are Fungal Diseases.

Black Spot ~ Downy Mildew ~ Powdery Mildew ~ Rust

Black Spot, Downy Mildew, and another fungal disease (Anthracnose) are often confused because they look so similar.

The good news is, they are all treated (and prevented) by the same method.

Downy Mildew

Downy Mildew is the most damaging fungal disease for roses. The name itself confuses people, because it does not resemble down, or mildew.

The dark lesions are more irregular shaped, and often bounded on one side by leaf veins.

This disease is very often confused with black spot, as it has dark spots on the leaves, and the leaves turn yellow and drop off.

Treatment the same as for blackspot..

Black Spot Rose Disease

picture of black spot on rosesBlack Spot on Roses

Black Spot is the number two most damaging rose disease.

It causes dark rounded spots with feathered edges,and yellowing of leaves. It also causes leaf drop that although is not rapid, is persistent.

If untreated, it will defoliate most rose bushes by the end of the season (and possibly spread to other bushes)

Once the bush is defoliated it cannot take in the nourishment it needs to be healthy and strong and able to survive the long winter months ahead.

Remove all infected leaves (including those on the ground).

Powdery Mildew

picture of powdery mildew on rosesPowdery Mildew

Powdery Mildew is the easiest to diagnose. It looks like a white powder on the leaves. Or like they were dusted with flour.

Fall is the most common time of year for this fungus; Warm days and cool nights.

Good air circulation with proper spacing between plants can help to avoid it.

You should remove all leaves that are affected to another area of the yard. (Never compost fungus infected leaves.)


Rose rust is spread by the wind, the spores are allowed to enter the leaf tissue through moisture.

The orange to yellow brown spots first appear on the undersides of the leaves. The leaves become deformed, and drop.

Be careful when choosing roses for your garden, as some are particularly susceptible to rust. Learn more about rose rust..

For treating your roses with these rose bush diseases (fungal) problems... Here is a very simple recipe for an all natural organic treatment . Follow This link.

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Common Rose Diseases

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