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Podredumbre gris
WHAT IS AND HOW TO ELIMINATE
Gray Rot
Botrytis Cinerea
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Botrytis cinerea is a necrotrophic fungus that affects a wide range of plants, including pepper. This fungus produces conidial spores that are dispersed primarily through air and rain splashes. Spores germinate in conditions of high humidity, penetrating plant tissues through wounds or natural openings such as stomata and lenticels. Once inside the plant, the fungus produces enzymes that break down cell walls, causing necrosis in infected tissues. During its development, Botrytis cinerea forms a mass of dense, gray mycelium, which is characteristic of the infection. This mycelium produces new spores that can be spread to other plants, perpetuating the infection cycle. The fungus can also survive in plant remains such as sclerotia, resistant structures that allow it to persist in soil or dead plant material until conditions are again favorable for its growth.
SYMPTOMS
Gray rot caused by Botrytis cinerea in pepper manifests itself as a destructive disease that mainly affects the aerial parts of the plant. Initial symptoms include watery, discolored Taches on leaves, stems and fruits, which quickly expand and become covered with a dense layer of gray mycelium.
Brown Taches on leaves, turning into necrotic areas
Watery lesions on the stems, which turn brown and soft
Fruit infection, showing soft, rotten areas, often covered by a grayish layer of sporulation
Premature shedding of flowers and fruits
Reduction in plant vigor and wilting
Presence of sclerotia in plant remains, indicating a source of persistent inoculum
TEMPERATURE AND HUMIDITY
15-25 C
90-100
HOW IS IT SPREAD?
Spores in the air, splashed rain, contact with contaminated tools, contact with infected plants, contaminated plant debris
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 25% [SC] P/V
• CIPRODINIL 37.5% + FLUDIOXONIL 25% [WG] P/P
• DIFENOCONAZOLE 25% [EC] P/V
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• PHENHEXAMIDE 50% [SC] P/V
• PHENHEXAMIDE 50% [WG] P/P
• PHENPIRAZAMINE 50% [WG] P/P
• FLUDIOXONIL 50% [WG] P/P
• FLUOPYRAM 25% + TRIFLOXISTROBIN 25% [SC] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• LAMINARIN 4.5% [SL] P/S
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% ( ) [WG] P/P
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% (I) [WG] P/P
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% [WG] P/P
• PYRIMETANIL 40% [SC] P/V
• TEBUCONAZOLE 20% [EW] P/V
• TEBUCONAZOLE 25% [EW] P/V
• TEBUCONAZOLE 25% [WG] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
Authorized treatments in organic farming
• EUGENOL 3.3% + GERANIOL 6.6% + THYMOL 6.6% [CS] P/V
• POTASSIUM HYDROGEN CARBONATE 0.425% [AL] P/V
• POTASSIUM HYDROGEN CARBONATE 85% [SP] P/P
• LAMINARIN 4.5% [SL] P/S
• COPPER OXYCHLORIDE 35% (EXPR. IN CU) [WG] P/P
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/
Insect allies
EFFECTIVE PRODUCTS TO ELIMINATE THIS PEST
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Effective against all types of fungi
Practice good hygiene in the greenhouse, removing plant debris and disinfecting tools
Ensure good ventilation and irrigation management to reduce relative humidity in the environment
Use preventive and curative fungicides according to recommendations and rotate products to avoid resistance.
Perform appropriate pruning to improve air circulation and light penetration into the foliage
Avoid wounds on plants during cultivation practices, as they are entry doors for the fungus.
Apply biological treatments with biological control agents such as Trichoderma spp. or Bacillus spp.
Maintain constant monitoring of plants to detect and treat infections in their initial stages
Implement integrated pest management (IPM) that includes cultural, chemical and biological measures
Use pepper varieties resistant or tolerant to Botrytis cinerea if available
Recommendations
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