Cancros
Canker Or Gummy Rot
Didymella Bryoniae
Pathogen:
Fungus
Type:
Risk to the plant:
INTERMEDIATE
DESCRIPTION
WHO CAUSES IT?
Didymella bryoniae is a phytopathogenic fungus that affects various cucurbits, causing the disease known as canker or gummy rot. The fungus can survive in soil and infected plant remains for long periods, waiting for favorable conditions to germinate. Didymella bryoniae produces spores that spread through air and water, infecting new plants. The fungus can invade plant tissues, including stems, leaves and fruits, causing the disease.
SYMPTOMS
Canker or gummy rot caused by Didymella bryoniae in cucurbits manifests itself with the appearance of brown lesions on stems, leaves and fruits. Lesions may exude a gummy liquid, especially on stems and fruits. These lesions can expand, causing the death of the affected parts.
• Brown lesions on stems, leaves and fruits.
• Gummy exudate in lesions of stems and fruits.
• Expansion of lesions that can cause death of affected parts.
• Reduction in the quality and quantity of the harvest.
TEMPERATURE AND HUMIDITY
15°C - 25°C
70% - 90%
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 25% [SC] P/V
• DIFENOCONAZOLE 12.5% + CYFLUFENAMIDE 1.5% [DC] P/V
• DIFENOCONAZOLE 25% [EC] P/V
• FLUXAPYROXAD 7.5% + DIFENOCONAZOLE 5% [SC] P/V
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 cucurbit varieties resistant or tolerant to Didymella bryoniae.
• Practice crop rotation to reduce pathogen pressure in the soil.
• Improve air circulation and avoid excess humidity in crops.
• Apply specific fungicides following local recommendations.
• Disinfect cultivation tools and equipment to prevent the spread of the fungus.
• Eliminate and destroy infected plants and plant remains.
Recommendations
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