Rose diseases - causes, damage and control

Roses are plagued by fungal diseases if they are placed in the wrong locations or if they are not cared for. Here you will find signs of damage and tips for treatment.

Lush leafy and magnificently blooming roses are the pride of every hobby gardener. But the sense of honor is quickly cracked as soon as the queen of flowers is afflicted by rose diseases. The most common diseases in roses include black mildew, powdery mildew and rose rust. These are leaf diseases caused by a fungal attack.

You can take preventive measures against this right from the start. The fungal infestation of roses can be greatly reduced by choosing the optimal location and conscientious care. However, this does not rule him out.

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

1Black Dew

Schadbild:
You can recognize the infestation of your rose with the black spot fungus by the radiating black spots on the leaves. After some time, the foliage turns yellow and eventually falls off.
The lower, weakly developed leaves of the plant can be affected as early as the first pile. The warm, humid weather in summer offers the best conditions for blackspot to spread. The rose is largely affected in late summer to autumn. In addition, sensitive varieties can lose their foliage completely in years with high rainfall.
Prevention:
Choose a robust, he althy plant when you buy it. Rose nurseries already point out the leaf he alth of each individual plant in their range in the catalogue. You should also avoid wetting the leaves with water when watering (spray or sprinkler from above). Ultimately, infested foliage should be collected and disposed of with household waste.
Control:
To keep fungal infestation as minimal as possible, it is advisable to keep the roses To be treated with a fungicide already after the middle/end of the shoot. From mid-June, spray your plants every 14 days.

Rose Spray SaprolAF
Celaflor Mushroom Free Ectivio
BaymatWG
Cueva fungus protection

2Powdery mildew

Damage:
The tops 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 infestation occurs mainly in warm, humid weather.
Prevention:
Plant robust varieties in an airy location. Potassium fertilization is also recommended. This strengthens the resistance of the rose. Cut out infested areas to prevent the fungal disease from spreading.
Control:
As soon as the first signs of mildew appear, cut out the visible areas and spray the rose fortnightly with one of these fungicides:

Rose Spray Saprol AF
Celaflor Mushroom Free Ectivio
Baymat WG
Cueva fungus protection

3Rose Rust

Damage:
Orange-rust colored spores appear on the underside of the leaves in spring around April to May, which dust when touched.
Prevention: When choosing roses, choose a variety with he althy leaves. To prevent rose rust from spreading, collect the infested leaves and dispose of them in the household waste.
Control agents: If your roses become infested with the If you notice rose rust, then fight it every 14 days
- Celaflor Mushroom Free Ectivio
- Ortiva Rose Fungus Protection
- Cueva fungus protection
- Saprol AF
- Baymat WG
4Downy mildew

Damage:
A greyish mold lawn is spreading on the underside of the leaf. In addition, dark spots form on the upper side of the leaf. The affected foliage wilts and eventually falls off
Prevention:
When buying your roses, choose resistant varieties and place them in an airy location. To prevent the spread of downy mildew as far as possible, cut out the affected parts of the plant.
Control:
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:
- COMPO Ortiva
- Copper Lime Atempo
5Botrytis

Damage:
Point to the flowersbrown or reddish specks appear. This fungus spreads throughout the flower in high humidity or rainfall. Eventually, the pile rots from the base of the flower. In addition, soft rotten spots develop on leaves and shoots.
Wet leaves and subtropical weather with a relative humidity of over 85 percent and temperatures above 30° C promote the infestation of the fungal disease.
Prevention:
The location for your roses should be well ventilated so that the roses can dry off quickly after rainfall.
Cut off infested parts of the plant and throw them away with household waste. To prevent botrytis, refrain from using pure nitrogen fertilization and loosen the soil more often so that water does not accumulate in the first place.
Fighting agents:
At the first sign of botrytis spray your rose with the spray below:
- Neudovital rose fungus protection