Micosis/Hongos
Black Spot On Rose Bush
Diplocarpon Rosae / Marssonina Rossae
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
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.
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.
TEMPERATURE AND HUMIDITY
22°C - 28°C
70% - 85%
HOW IS IT SPREAD?
Direct contact with fungal spores, wind spread, and human transportation of infected plant material.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• ORANGE OIL 60g/L [ME] P/S
• SULFUR 0.4% [AL] P/V
• SULFUR 0.4% + POTASSIUM SALTS OF UNSATURATED FATTY ACIDS C7-C18 & C18 (CAS [67701-09-1] 1% [AL] P/V
• SULFUR 20% [SC] P/V
• DIFENOCONAZOLE 0.0167% [AL] P/V
• DIFENOCONAZOLE 1.67% [EC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• TEBUCONAZOLE 0.0125% + TRIFLOXISTROBIN 0.0125% [AL] P/V
Authorized treatments in organic farming
• ORANGE OIL 60g/L [ME] P/S
• SULFUR 0.4% [AL] P/V
• SULFUR 0.4% + POTASSIUM SALTS OF UNSATURATED FATTY ACIDS C7-C18 & C18 (CAS [67701-09-1] 1% [AL] P/V
• SULFUR 20% [SC] P/V
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
Insect allies
PREDATORY MITES
LADYBUGS
LACEWINGS
PARASITIC WASPS
HOVERFLIES OR PARASITIC FLIES
PREDATORY BUGS
There are no natural allies
Mycodiplosis oidii (predatory mosquito)
EFFECTIVE PRODUCTS TO ELIMINATE THIS DISEASE
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To prevent and control Rose Black Spot, it is important to implement integrated pest management practices. This includes regular pruning to promote good air circulation, watering at the base of the plants to avoid wetting the leaves, and removing infected leaves. Additionally, preventative fungicides can be applied during times of highest risk of infection.
Recommendations
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