Best Treatment for Rose Diseases 

By  Enda

It would be hard to find someone who didn't appreciate the beauty of the rose. It truly is a thing of beauty, and as you may already know roses come in many varieties.

In this article we will be looking at the best pest treatment for roses, rather then exploring the many varieties, and which types of roses you should grow. 

Unless you are a dedicated rose lover or rose gardener, most home owners simply end up with a garden where a few rose bushes have already been growing.

The most popular rose bushes grown in the UK are:

  1. Madame Isaac Preire
  2. Ferdinand Pichard
  3. Aloha
  4. Windrush English Rose
  5. Bourbon rose (Variegata di Bologna)
  6. Ballerina
  7. Prince William
  8. Margaret Merrill
  9. Rosa Moyesli, or Rosa the Garland or Rosa Sex Rexy
  10. The Queen of Denmark
  11. Tuscany Superb
  12. Cottage Rose

They are a beautiful shrub, but they do need some regular care and attention.

To make sure that your roses remain in the best of health, simply follow these tips

Tip 1 - Black Spots on Rose Leaves

This disease is commonly known as black spot. Black spots appear as circular with fringed edges on leaves. They start out as black spots and then they start to cause the leaves to yellow.

You do need to treat these black spots otherwise they can cause a lot of damage. This black spot is classed as a fungal disease. Any fungal disease, including this one will thrive in wet warm weather.

Treating Black Spot

To treat this, remove the infected foliage and pick up any fallen leaves around the rose. Don't use these in your compost heap.

Artificial sprays may be used to prevent or treat this kind of rose disease. Any chemical fungicide will do a very good job of treating and killing off black spot on your roses.

You can also use an organic spray as long as it contains neem oil, sulphur, lime or copper.

Preventing Black Spot

  • If your roses need watering then do it in the early morning. Also try to avoid watering the actual foilage and concentrate on watering the roots of the bush.
  • Don't grow any other plants in and around the roses, as this will restrict air flow and air circulation.
  • In the ideal world always make sure that rose bushes are planted where they will get sunshine most of the day.
  • The best prevention of all is a weekly inspection. If you see black spots appearing on leaves, remove those leaves and bin them.

Tip 2 - Treating Stunted or Malformed Young Canes

This is often called rose deformity. This is a complicated one to correct and sometimes it is just down to what happens with Mother Nature. There can be what is called a genetic disorder, and in reality there is nothing we can really do about that.

It is where a number of leaves may start growing into one another to form one large leaf. They are caused by a combination of insect attacks, fungal issues and viruses.

There are also problems with what is termed proliferation. This is where you may get green growth coming out of the actual blooms.

The only real treatment is to do a lot of heavy pruning, and then avoid using any fertilizers until you can observe the new growth. We actually recommend digging out the bush and removing it from the garden, as deformed rose bushes are very hard to treat and correct.

Tip 3 - Blistered Underside of Leaves

This is very similar to the black spots that we have already mentioned. In this case though the spots are a rust colour. Known as rust, this disease is characterized by orange-red blisters that turn black in fall.

This fungal problem can even survive the winter and will then attack new sprouts in the spring. As with the black spots pull of the leaves that are infected in the Autumn and bin them.

Then treat the rose bush with a Benomyl or Funginex spray every 7-10 days may help.

Known as powdery mildew, this is a fungal disease that covers leaves, stems and buds with wind spread white powder. It makes the leaves curl and turn purple. Spray with Funginex or Benomyl to treat this fungal disease.

Tip 4 - Malformed or Stunted leaves and Flowers

This is caused by spider mites. They are tiny yellow, red or green spiders found on the underside of leaves where they suck juices. The application of Orthene or Isotox may help in treating this infestation.

Tip 5 - Weak and Mottled Leaves with Small White Webs under them

This is caused by aphids. They are small soft-bodied insects that usually brown, green or red. Often clustered under leaves and flower buds, they suck plant juices from tender buds. Malathion or diazinon spray may help roses to survive these bugs.

Tip 6 - Flowers that don't open or are deformed when they open.

Thrips could be the reason behind this problem. They are slender, brown-yellow bugs with fringed wings that also suck juices from flower buds. Cut and discard the infested flowers. Orthene and malathion may also treat this problem..

Remember that roses are hungry feeders that require much fertilizer to become healthy bushes.


I am someone who enjoys a little gardening. Now I am not someone who spend hours in the garden, but I do like both my front and back gardens to look really nice. Well kept lawns, neatly trimmed hedges, and borders filled with plants, make a huge difference, to how your property looks.

Enda McLarnon

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