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Quince > Dark blotch
What Causes Dark Blotch on Quince Leaves?
Quince, also known as Quince
Dark blotch is a devastating fungal disease impacting Quince plants. Caused by Diplocarpon mespili, it produces black lesions on leaves, fruits, and twigs, severely reducing the plant's health and productivity.

Symptom Analysis

The disease manifests as dark, irregularly shaped blotches on leaves and fruits, accompanied by wilting of plant tissues. As the disease progresses, defoliation and fruit drop may occur.
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What Causes Dark blotch Disease on Quince?

Diplocarpon mespili
This fungus is the primary cause of Dark blotch. It proliferates in damp, warm climates, producing fungal spores that infect Quince plants.
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How to Treat Dark blotch Disease on Quince?

Non pesticide
Remove and destroy infected plant parts: It's crucial to regularly inspect the plants, removing any infected leaves or fruits to prevent the spread of the disease.

Cultural practices: Maintaining plant hygiene, providing proper spacing for better air circulation, and avoiding water splash can reduce the disease incidence.
Pesticide
Fungicidal sprays: Applying licensed fungicides, following the manufacturer's instructions, can help control the disease.

Systemic fungicide: Systemic fungicides help in eradicating the disease from the inside out, providing more effective control.

How to Prevent Dark blotch on Quince?

Proper irrigation
Avoid overhead irrigation to minimize water splash, reducing the spread of fungal spores.
Resistant varieties
Planting disease-resistant varieties can greatly reduce the disease incidence.
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When is Dark blotch Most Active Period on Quince?

Dark blotch is most active in warm, wet conditions, particularly spring and early summer, as the fungal spores depend on moisture and moderately high temperatures to germinate and infect the host plant.

Infectivity

The disease is highly infectious, spreading through airborne spores, rain splashes, and close plant contact.

Lethality

While not directly lethal, severe infections can significantly weaken the plant, leading to reduced yield, stunted growth, and potential death if untreated.

FAQs on Quince

What causes dark blotches on Quince plants?
Dark blotches are caused by a fungus Diplocarpon mespili. The disease is prevalent in damp, warm climates.
How can I treat dark blotch disease on my Quince plant?
Removing and destroying affected parts and applying fungicidal sprays can help in treating the disease. Clean culture practices and proper watering can also prevent the spread.
Is Dark blotch disease lethal to Quince plants?
The disease is not directly lethal but can weaken the plant, stunting its growth and reducing yield. Severe untreated infections may lead to the plant's death.
How can I prevent the disease from affecting my Quince plant?
Good hygiene, planting disease-resistant varieties, and avoiding overhead irrigation can help prevent the disease.
Can Dark blotch spread to other plants in my garden?
Yes, the fungus can spread through airborne spores, rain splashes, and close plant contact.
Which part of the Quince plant is most affected by Dark blotch?
Dark blotch mainly affects the leaves and fruits of the Quince plant.
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