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White willow > Dark blotch
What Causes Dark Blotch on White willow Leaves?
White willow, also known as Water willow, Cricket-bat willow, Sallow tree, Swallow Tail Willow
Dark blotch is a fungal disease that severely affects White willow, causing dark yellow-brown patches on leaves leading to premature shedding. If improperly managed, the disease can decrease photosynthesis, hence the overall growth and survival of the plant.

Symptom Analysis

Dark blotch presents as dark yellow-brown patches on the leaf surface in the early stages. As the disease progresses, the patches expand and darken until the leaf becomes wilted, leading to premature shedding.
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What Causes Dark blotch Disease on White willow?

Fungal Pathogen
Dark blotch of White willow is caused by the fungal pathogen Diplodia Sacc., which usually enters the plant through natural tears or wounds.
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How to Treat Dark blotch Disease on White willow?

Non pesticide
Pruning: Remove and dispose infected parts of the plant to prevent disease spread.

Uninfected environment: Ensure the surrounding environment is free of the pathogen to reduce risk of reinfection.
Pesticide
Fungicides: Apply fungicides designed for fungal pathogens such as Diplodia Sacc., ensuring that it is evenly distributed on the plant surface.

How to Prevent Dark blotch on White willow?

Regular inspections
Systemically inspect White willow for early signs of Dark blotch to enable prompt treatment.
Preventive fungicides
Apply preventive fungicides prior to the disease's most active seasons (spring or monsoon), particularly if the disease has previously occurred.
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When is Dark blotch Most Active Period on White willow?

The disease is most active during spring and monsoons, exacerbated by humidity and rainfall which accelerates fungal growth and spreads spores.

Infectivity

Spores of the fungus quickly spread through rain splash, wind, or contaminated equipment, posing a high infection risk.

Lethality

While not immediately lethal, over time it reduces White willow's growth and survival by diminishing its photosynthetic capability.

FAQs on White Willow

What color are the blotches caused by Dark blotch disease on White willow?
The blotches are dark yellow-brown in color in the early stages, becoming darker as the disease progresses.
When should I apply fungicides to control Dark blotch disease in White willow?
Application of preventive fungicides is recommended prior to its most active seasons, particularly spring and monsoon.
How does Dark blotch disease affect the growth and survival of White willow?
Dark blotch disease diminishes photosynthesis by causing leaves to wilt and shed prematurely, negatively affecting growth and survival of White willow.
How infectious is the Dark blotch disease?
Dark blotch disease is highly infectious, as spores can spread rapidly via wind, rain splash, or contaminated equipment.
Is Dark blotch disease lethal to White willow?
While not immediately lethal, over time, Dark blotch disease can cause serious harm by reducing growth and survival of White willow.
What are the best preventive measures for Dark blotch disease in White willow?
Regular inspections for early signs of disease, and applying preventive fungicides prior to the disease's active seasons are the best preventive measures for Dark blotch disease in White willow.
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