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Soursop > Dark blotch
What Causes Dark Blotch on Soursop Leaves?
Soursop, also known as Guyabano
Dark blotch is a fungal disease posing a significant threat to Soursop. The infection leads to sunken, black spots on the plant, severely damaging leaves, fruits, and stems. If not treated promptly, the disease can decimate the entire plant population.

Symptom Analysis

In Soursop, initial symptoms of dark blotch include small, water-soaked spots on leaves, stems, and fruit. As the disease progresses, these areas darken and expand, becoming sunken and forming a distinctive 'blotch'.
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What Causes Dark blotch Disease on Soursop?

Pathogen
The disease is primarily caused by the fungus 'Guignardia citricarpa', which thrives in damp and shady conditions.
Environmental conditions
Dark blotch thrives in high moisture and poor air circulation conditions, typically seen in overcrowded plantings.
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How to Treat Dark blotch Disease on Soursop?

Non pesticide
Pruning: Regularly prune Soursop to ensure good air circulation to prevent fungal growth.

Sanitation: Remove and destroy infected parts or fallen debris from the plant to reduce the disease source.
Pesticide
Fungicidal spray: Use an effective fungicidal spray like Mancozeb or Copper-based fungicides to control the spread of the disease.

How to Prevent Dark blotch on Soursop?

Proper Spacing
Ensure adequate spacing between plants to facilitate air movement and minimize humidity.
Regular Monitoring
Detect early signs of infection by regularly checking the undersides of leaves and near the stem.
Preventive Fungicides
Regular application of preventative fungicides can control dark blotch before it infests the plant.
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When is Dark blotch Most Active Period on Soursop?

Dark blotch is most active during the wet season when conditions become more humid. Damp conditions along with poor air circulation in thick canopies provide the fungus with an optimal breeding ground.

Infectivity

Dark blotch spreads rapidly as the spores are disseminated by wind and rain splash.

Lethality

Untreated dark blotch can lead to extensive leaf fall, fruit drop, and diminished plant vitality, but it rarely results in plant death.

FAQs on Soursop

How quickly can dark blotch spread in Soursop?
Dark blotch can spread rapidly in favorable conditions, with symptoms appearing within a few days of infection.
Can dark blotch be cured in Soursop?
Yes, methods such as pruning, sanitation, and the use of fungicidal sprays can effectively cure dark blotch.
Does dark blotch only affect the leaves of Soursop?
No, besides leaves, dark blotch heavily damages the fruit and stems of Soursop.
Can dark blotch kill Soursop plants?
While lethal in some cases, most plants survive if the disease is controlled in early stages.
Is dark blotch restricted to certain seasons?
Dark blotch is more prevalent during wet seasons, but it can technically occur any time in high humidity and poor ventilation conditions.
What measures can be taken to prevent dark blotch in Soursop plants?
Preventive measures include proper spacing of plants, regular monitoring, and the application of preventive fungicides.
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