Tips & Tricks

Rose diseases - causes, damage patterns and control


Roses are afflicted in the wrong locations or with inadequate care of fungal diseases. Here you can find damage patterns and tips for treatment.

Lavishly leafy and splendidly blooming roses are the pride of every hobby gardener. But the feeling of honor is quickly cracked as soon as the queen of flowers is struck by rose diseases. The most common diseases in roses include star soot, powdery mildew and rose rust. These are leaf diseases that are caused by a fungal attack.

On the other hand, you can take preventive measures from the outset. In this way, the fungus infestation of roses can be greatly reduced with the choice of the optimal location and conscientious care. However, this does not rule it out.

In the next 6 sections, we would like to provide you with comprehensive information about damage patterns, prevention and disease control in rose diseases.

1Sternrußtau

Damage symptoms:
You can recognize the infestation of your rose with the sooty fungus by the radiating black spots on leaves. After a while the leaves turn yellow and finally fall off.
The lower, weakly developed leaves of the plant can already be affected with the first pile. The warm, humid weather in the summer offers the best soot dew spreading. The rose is largely infected in late summer to autumn. In addition, sensitive varieties can completely lose their leaves in rainy years.
Prevention:
Choose a robust, healthy plant when you buy it. Rose schools already refer to the leaf health of each individual plant in their range in the catalogs. In addition, when watering, you should absolutely avoid wetting the leaves with water (shower or sprinkler from above). Ultimately, infested leaves must be collected and disposed of with household waste.
Control agents:
In order to keep fungal infestation as minimal as possible, it is advisable to treat the roses with a fungicide after they have sprouted mid / end. From mid-June, spray your plants every 14 days.

  • Saprol AF rose spray
  • Celaflor Mushroom Free Ectivio
  • BaymatWG
  • Cueva mushroom protection

2 powdery mildew

Damage symptoms:
The top of the leaves, calyxes and fresh shoot tips are covered with a floury, white, wipeable coating. Finally, the affected leaves curl and turn reddish. Powdery mildew is mainly affected by warm, damp weather.
Prevent:
Plant robust varieties in an airy location. Potash-based fertilization is also recommended. This increases the rose's resistance. Cut out infected areas so that the fungal disease does not spread.
Control agents:
As soon as the first signs of powdery mildew appear, cut out the recognizable areas and spray the rose every two weeks with one of these fungicides:

  • Saprol AF rose spray
  • Celaflor Mushroom Free Ectivio
  • Baymat shared apartment
  • Cueva mushroom protection

3Rosenrost

  • Damage symptoms:
    Orange-rust-colored spore beds appear in spring from April to May on the underside of the leaf, which dust when touched.
    Prevent:
    When choosing roses, choose a variety with high leaf health. In order to avoid the spreading of rose rust, collect the infected leaves and destroy them in the household waste.
    Control agents:
    If you perceive an infestation of your roses with the rose rust, then fight it every 14 days

    • Celaflor Mushroom Free Ectivio
    • Ortiva rose mushroom protection
    • Cueva mushroom protection
    • Saprol AF
    • Baymat shared apartment

    4 Faulty mildew

    Damage symptoms:
    A grayish moldy lawn spreads on the underside of the leaf. In addition, dark spots form on the top of the leaf. The infested foliage wilts and ultimately falls off
    Prevent:
    When purchasing your roses, choose hardy varieties and place them in an airy location. To prevent the downy mildew from spreading as far as possible, cut out the infected plant areas.
    Control agents:
    The fungus attacks the plant from mid-April to mid-July. As soon as rose rust appears on the leaves, spray every 14 days with one of the following fungicides:

    5Botrytis

    Damage symptoms:
    Brown or reddish specks appear on the flowers. This fungus spreads over the entire flower in high humidity or precipitation. Finally, the pile starts to rot from the flower base. In addition, there are soft rot on the leaves and shoots.
    Leaf wetness and subtropical weather with a relative humidity of over 85 percent and temperatures above 30 ° C promote the infestation of the fungal disease.
    Prevent:
    The location for your roses should be well ventilated so that the roses can dry out quickly after rainfall.
    Cut off infected plant parts and destroy them in the household waste. To prevent botrytis, do not use pure nitrogen fertilization and loosen the soil more often so that water does not collect at all.
    Control agents:
    At the first signs of botrytis, spray your rose with the following spray: