
Acelga
How to recognize and combat alternariosis in chard
Alternariosis
Fungus
Type:
Risk to the plant:
INTERMEDIATE
Alternaria Sp.
Pathogen:

Alternariosis
WHO CAUSES IT?
Alternaria sp. is a genus of fungi that includes several phytopathogenic species that affect a wide range of plants, including chard. These fungi are saprophytic and necrotrophic, capable of surviving on plant remains in the soil or on infected seeds during unfavorable periods. Alternaria produces conidia in long chains that are easily dispersed by wind, water, and physical contact. These conidia germinate in conditions of high humidity, penetrating the plant tissue through wounds or directly through the stomata. Once inside the plant, the fungus produces toxins that kill cells and feed on dead material, forming characteristic necrotic Taches. Alternaria development is favored by warm, humid environments, allowing for multiple cycles of infection during a growing season.
SYMPTOMS
In chard, Alternaria sp. It causes a disease known as alternariosis, which mainly affects the leaves, reducing photosynthesis and product quality. The infection begins with small dark Taches on the leaves that quickly enlarge and may merge, forming large necrotic areas. The lesions usually have a yellow border and, in high humidity conditions, may have a hairy appearance due to sporulation of the fungus.
• Small dark Taches on the leaves.
• Taches that enlarge and merge forming large necrotic areas.
• Lesions with yellow border.
• Hairy appearance in high humidity conditions.
• Reduction in photosynthesis.
• Loss of product quality.



DEVELOPMENT CONDITIONS
Temperature:
20ºC - 30ºC
Humidity:
80% - 100%
HOW IS IT SPREAD?
Wind, water, direct contact, gardening tools, infected seeds.
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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