Micosis/Hongos
Leaf Blight
Stemphylium Vesicarium
Pathogen:
Fungus
Type:
Risk to the plant:
HIGH
DESCRIPTION
WHO CAUSES IT?
Stemphylium vesicarium is a phytopathogenic fungus that affects various crops, including onion, causing a disease known as leaf blight. This fungus can survive in the remains of infected plants and in the soil. It produces spores (conidia) that spread easily through the air, infecting new plants. The fungus thrives in humid, warm conditions, and the spores can be dispersed through water droplets and wind, promoting the spread of the disease.
SYMPTOMS
Leaf blight caused by Stemphylium vesicarium on onions manifests itself with the appearance of brown or necrotic Taches on the leaves. The lesions can expand and join together, causing wilting of the leaves and reduced photosynthetic capacity of the plant.
• Brown or necrotic Taches on onion leaves.
• Lesions may expand and cause wilting of leaves.
• Reduction in the photosynthetic capacity of the plant.
• Decrease in the quality and quantity of the harvest.
TEMPERATURE AND HUMIDITY
20 ºC - 28ºC
80% - 100%
HOW IS IT SPREAD?
Air, water, remains of infected plants, contact with contaminated tools.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• AZOXISTROBIN 20% + DIFENOCONAZOLE 12.5% [SC] P/V
• AZOXISTROBIN 25% [SC] P/V
• CIPRODINIL 37.5% + FLUDIOXONIL 25% [WG] P/P
• FLUOPYRAM 20% + TEBUCONAZOLE 20% [SC] P/V
• FLUOXASTROBIN 10% + PROTHIOCONAZOLE 10% [EC] P/V
• PIRACLOSTROBIN 6.7% + BOSCALIDE 26.7% ( ) [WG] P/P
• TEBUCONAZOLE 20% [EW] P/V
• TEBUCONAZOLE 25% [EW] P/V
• TEBUCONAZOLE 50% + TRIFLOXISTROBIN 25% [WG] P/P
Authorized treatments in organic farming
-
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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• Use onion varieties that are resistant or tolerant to the fungus.
• Maintain good irrigation management to avoid excess humidity.
• Practice crop rotation to reduce pathogen pressure in the soil.
• Apply specific fungicides following local recommendations.
• Improve air circulation between plants to reduce humidity.
• Remove and destroy the remains of infected plants.
Recommendations
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