Black Spot on Roses

March 2, 2016 in Garden Pests by Christine

Black Spot on Roses Milk & Water Blackspot Spray for Roses

How to control black spot on rose bushesYou can hardly find a home garden without rose plants. Everyone loves to grow roses in the garden. With great care and attention, you will be able to easily maintain your rose plants. One of the most serious diseases that you find on the rose leaves is the black spot on roses. You should treat these black spots on the rose leaves to keep the rose plant healthy.

What is Rose Black Spot?

The black spots on the leaves of the rose plant are a nasty fungus. The black spot is known as Diplocarpon rosae is a fungal disease. As the name suggests, you will see black spots all over the leaves of the rose bush. If you do not treat the black spots on the bushes, then it will make the rose bushes defoliate.

What Causes Black Spot on Roses?

There are many home gardeners who wonder how the rose gets affected by the black spot fungus. One thing you need to understand is that roses and black spots go hand in hand. If you find the rose plants have very few black spots, then this can be tolerated to a certain extent without causing major damage to the plants. If your rose plant has huge amounts of black spots, then they would easily cause the leaves to defoliate.

The dark brown to black leaf spots seen on the upper leaves of the rose is the work of the fungus and this would finally end up turning the leaves to yellow colour and then drop. The dark black colour and the fringed edges help you to easily identify the black spots from other leaf spots. You might also see reddish–purple raised spots on the cane of the rose. The real cause of the black spots on the roses is the water splash from the ground soil, fungal spores splashing up on to the rose leaves, this is more prevalent in high rainfall areas of Australia and overhead watering will also cause black spot on roses. The fungus thrives in warm and humid conditions and is an ideal condition for the fungus to germinate and grow.

Black Spot Fungus on Roses Treatment 

If you find black spots on the leaves and branches of your rose plant, then you should prune away the infected leaves and canes. You should gather up all the fallen leaves of the plant. It is not ideal for you to collect the leaves and use it in the compost. It is better to collect the damaged leaves and throw it away. It is also a good idea to prune off all the stem lesions during spring time before the leaves start to show up. This will help in delaying the arrival of black spots.

Spraying Fungicides

After you have pruned off all the affected leaves and the stem, now it is time for you to treat the rose plants with a chemical fungicide.

  • You can get any fungicide available in the market and spray it over the entire plant.
  • Make sure that you spray it on the upper and lower leaves as well as the stems of the rose plant.
  • This will prevent the fungus to germinate and grow on your rose plant. Use this regularly during summer.
  • You can also use a number of organic options like: Neem Oil, Sulfur, Copper, Lime Sulfur and Potassium Bicarbonate.

Treatment for Fungal Black Spot on Your Roses
Using Baking Soda & Milk – Natural Remedies 

As soon as you spot a few black spots on your rose leaves, you can use a natural remedy using baking soda solution to prevent it from growing on the entire plant. It will work very well as a preventive measure and as baking soda contains salts, you should never use it in higher concentrations. This can damage your plant. Use 2 to 4 teaspoons of baking soda and mix it with 2 teaspoons of organic horticultural oil. Dissolve this mixture in a gallon of water. Do not spray this mixture of baking soda and organic horticultural oil during the heat of the day when the suns out because the oil in the mixture will attract the hot sun rays in turn this will burn the leaves on the roses.

You can also use plain full cream milk and water spray, milk does prevent and work against black spot on the roses – how does it do this? by the proteins in the milk they act with the sun to prevent black spot on roses.

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