Lechuga y similares
How to recognize and combat gray rot in lettuce and similar plants
Gray Rot
Fungus
Type:
Risk to the plant:
HIGH
Botrytis Cinerea
Pathogen:
Podredumbre gris
WHO CAUSES IT?
Botrytis cinerea is a pathogenic fungus that affects a wide variety of plants, especially in humid and temperate climates. This fungus produces conidia, which are asexual reproductive structures, released in large quantities when humidity conditions are high. Conidia are dispersed mainly through the air, settling on plant surfaces where they find wounds or weakened tissues to initiate infection. Upon establishing itself in plant tissue, the fungus develops a grayish mycelium that degrades plant tissues through the release of enzymes and toxins. As the infection progresses, the fungus also produces survival structures called sclerotia, which can resist adverse conditions and persist in soil or plant debris for long periods, ready to reinfect when conditions are favorable again.
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SYMPTOMS
Gray rot caused by Botrytis cinerea is a devastating disease for lettuce and similar crops, affecting both leaves and stems. The infection develops mainly in high humidity conditions and spreads rapidly in closed environments such as greenhouses. Initially, watery Taches are observed on the leaves, which expand and become necrotic, developing a characteristic gray mold in the affected areas.
- Watery Taches on leaves and stems.
- Progressive necrosis of the leaves.
- Appearance of a grayish mold on the affected tissues.
- Rotting of the lower leaves, especially in contact with the ground.
- Collapse of the plant in advanced stages.
- Formation of black sclerotia in infected tissues.
DEVELOPMENT CONDITIONS
Temperature:
15-20°C
Humidity:
90-100%
HOW IS IT SPREAD?
Airborne conidia, infected plant debris, contaminated tools, irrigation water, infected transplants
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.
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