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Species Page

white thread blight

Marasmiellus scandens
This information is part of a full datasheet available in the Crop Protection Compendium (CPC). Find out more information on how to access the CPC.
©CAB International. Published under a CC-BY-NC-SA 4.0 licence.

Distribution

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Extent
Invasive
Origin
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Host plants / species affected

Main hosts

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Theobroma cacao (cocoa)

List of symptoms / signs

Leaves - abnormal colours
Leaves - abnormal leaf fall
Leaves - fungal growth

Symptoms

The fungus forms a network of white mycelial strands that ramify across the leaves, petioles and branches. The infected leaves then undergo abscission and are then held together by the fungal threads and dense mycelial pads.

Prevention and control

Cultural Control

M. scandens can be adequately controlled through regular rounds of sanitation pruning during which infected and dead branches are removed.

Chemical Control

Due to the variable regulations around (de-)registration of pesticides, we are for the moment not including any specific chemical control recommendations. For further information, we recommend you visit the following resources:

Impact

M. scandens is of little economic significance on cocoa when it is kept under control. The disease is associated with poorly maintained plants already weakened by poor field management, other pests and diseases. The disease can usually be adequately controlled using cultural methods.