Flower growers on their household plots often face dark spots on the leaves of the rose, and do not understand what to do in this situation. This disease causes the fungus Marssonina rosae, which gradually brings rose bushes to death.
What does it look like?
Black spots on the leaves of roses refer to diseases that develop gradually. First, the darkening occurs on the center of the leaf plate, eventually capturing an increasingly large area. Soon the black and gray spot starts to turn yellow, and the leaf withers. The danger of this disease is that gradually, if you do not take any measures, the fungus from the leaves spreads to the trunk, and then to the root system, thereby destroying the plant from the inside.
Prevention of black spotting
In order not to struggle with an insidious disease, it can be prevented. For this, there are several ways in which you can improve the condition of your rose bushes:
- the right site for the rosary is the key to success; where there is no stagnation of water and noonday shadow, rose bushes are the least susceptible to the disease;
- Observance of sufficient distance between bushes for different kinds of roses will also help to avoid problems; a good air flow will not allow the fungus to form and multiply;
- in time the weeded weeds will not give moisture from rain or dew for a long time to stagnate in this place and there will be no favorable conditions for the disease.
Treatment of black patch of roses
There are several ways and means to treat black spots on the leaves of a rose. As a rule, they need to be combined to get a positive result:
- Without waiting for the disease, you can start using two types of drugs that help get rid of the disease or prevent it from arising. First of all, spraying with drugs containing mancozeb substance will be required. The treatment is carried out for
weeks every evening before dew drops. After that, drugs with triazole are used. - After rain and watering it is advisable to fill the trunks with wood ash.
- Regular spraying with infusion of garlic will increase the resistance of fungal infection.
- From time to time, the land where rose bushes grow is required to spill fungicides, to remove pathogenic microflora. It is especially useful to do this after long rains.
- Affected leaves and other parts of the rose are removed with a clean pruner. All diseased leaves and branches should be burned, and not stored on site.