Podredumbre gris
Gray Rot
Botrytis Cinerea
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Botrytis cinerea is a phytopathogenic fungus that affects a wide variety of plants, including cacti and succulents. This fungus develops mainly in conditions of high humidity and moderate temperatures. It begins with the production of conidial spores, which are dispersed through the air and deposited on the surfaces of host plants. Under favorable conditions, spores germinate and produce hyphae that penetrate plant tissue through wounds or natural openings. Once inside, the fungus spreads and produces mycelium, destroying the host's cells and causing visible symptoms of the disease. Botrytis cinerea can also produce sclerotia, resistance structures that allow its survival in adverse conditions and its subsequent reactivation when conditions improve.
SYMPTOMS
In cacti and succulents, Botrytis cinerea causes the disease known as gray rot, which is characterized by the appearance of watery lesions in the affected tissues. These lesions usually expand rapidly, becoming dark brown or black necrotic areas.
- Watery lesions on leaves and stems.
- Development of a grayish mold on infected areas.
- Discoloration and necrosis of the affected tissues.
- Loss of firmness in the affected parts of the plant.
- Withering of leaves and stems.
- Loss of vigor and delay in growth.
- Premature fall of leaves and flowers.
- Development of sclerotia in dead tissues.
TEMPERATURE AND HUMIDITY
15°C - 25°C
85% - 100%
HOW IS IT SPREAD?
Wind, water, contaminated tools, direct contact with infected plants, spores carried by insects, dispersal through soil
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 25% [SC] P/V
• CAPTAN 47.5% [SC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• PHENHEXAMIDE 50% [WG] P/P
• FOLPET 50% [SC] P/V
• FOLPET 80% [WG] P/P
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% (I) [WG] P/P
Authorized treatments in organic farming
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• COPPER OXYCHLORIDE 35% (EXPR. 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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- Maintain good ventilation around the plants to reduce humidity.
- Avoid excessive irrigation and ensure good soil drainage.
- Remove and destroy infected parts of the plant to prevent the spread of the fungus.
- Use appropriate fungicides, applying them in accordance with the manufacturer's recommendations.
- Implement crop rotation practices to avoid the accumulation of inocula in the soil.
- Carry out periodic inspections to detect the first signs of infection.
- Minimize wounds on plants during handling and harvesting.
- Ensure correct separation between plants to allow good air circulation.
Recommendations
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