Black Spot On Rose Bush
WHAT IT IS AND HOW TO ELIMINATE
Rosal
Black Spot On Rose Bush
Diplocarpon Rosae / Marssonina Rossae
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
Micosis/Hongos
WHO CAUSES IT?
Rose Black Spot, caused by the fungus Diplocarpon rosae, is a common disease that affects rose bushes around the world. This pathogen can cause significant damage to ornamental plants, especially under conditions of high humidity and heat.
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SYMPTOMS
In rose bushes, Black Spot appears as black to dark brown lesions on the leaves, accompanied by a yellow edge. These lesions usually have an irregular appearance and can merge, affecting a large part of the leaf surface. Additionally, the disease can weaken the plant and reduce its ability to produce flowers.
DEVELOPMENT CONDITIONS
Temperature:
22°C - 28°C
Humidity:
70% - 85%
HOW IS IT SPREAD?
Direct contact with fungal spores, wind spread, and human transportation of infected plant material.
HOW TO ELIMINATE IT?
Home treatments
There are no home treatments
Natural allies
Chemical treatments
There are no treatments for this disease. Treatments are directed at the insect vectors that transmit it. See insect treatments.
RECOMMENDED PRODUCTS TO ELIMINATE THE PEST
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Effective against all types of fungi
REPELLENT PLANTS
Rosemary, Dill, Coriander
RECOMMENDATIONS
- Check the back of the leaves frequently, especially in dry weather.
- Spray water on the leaves to increase humidity and prevent them from settling.
- Keep plants healthy with good watering and adequate light.
- If you see cobwebs or damage, clean the leaves with a damp cloth or pressurized water.
- Use potassium soap or neem oil every few days until they disappear.
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