Cancros
Black canker or branch canker: what it is, how it originates, and how to effectively eliminate it
Black Cancer Or Canker Of The Branches
Sphaeropsis Malorum / Botryosphaeria Obtusa
Pathogen:
Fungus
Type:
Risk to the plant:
MILD
DESCRIPTION
WHO CAUSES IT?
Sphaeropsis malorum is a phytopathogenic fungus that affects apple trees, causing the disease known as black cancer or apple canker. The fungus primarily infects the branches, trunk and roots of the tree through wounds, and can spread through spores that are dispersed by wind and water. The fungus is most active in conditions of high humidity and moderate temperatures.
SYMPTOMS
Black canker or apple canker produces dark lesions on the branches, trunk and roots of the apple tree. The lesions begin as brown or blackish Taches and expand, causing death of bark and woody tissues. These injuries can weaken the tree and reduce its productivity.
• Brown or blackish lesions on branches and trunk.
• Death of the bark and woody tissues.
• Cracking and falling branches.
• Reduction in tree growth.
• Decrease in productivity and quality of fruits.
TEMPERATURE AND HUMIDITY
15°C - 25°C
80% - 95%
HOW IS IT SPREAD?
Spores carried by wind, rainwater or irrigation, contaminated pruning tools, direct contact with infected plants.
HOW TO REMOVE IT?
Home remedies
There are no home treatments
Chemical treatments
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
• CAPTAIN 80% [WG] P/P
Authorized treatments in organic farming
• COPPER OXYCHLORIDE 35% (exp. in Cu) [WG] P/P
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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• Prune and remove infected branches to prevent spread.
• Avoid damaging the trunk or branches during handling.
• Use specific fungicides during critical moments of development.
• Improve air circulation between trees to reduce humidity.
• Select varieties of apple trees resistant to the fungus.
• Monitor regularly to detect early infections.
• Disinfect pruning and harvesting tools.
• Rotate crops to avoid the accumulation of pathogens in the soil.
Recommendations
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