Rigidoporus microporus

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Rigidoporus microporus fruiting bodies with epiphytes (click on image to enlarge it)
Source: Wikimedia Commons

Rigidoporus microporus (Sw. : Fr.) Overeem 1924 - (white root disease of rubber)

This fungus is widely distributed in tropical regions where it causes white root disease of rubber and other tree crops like cacao, coffee, tea, coconut or oil palm. For example, it is a serious pathogen of rubber in southern Asia and West Africa. The disease can cause tree death and effects mainly young rubber trees (< 5 years). Losses can be high.

The main symptoms are the flattened strands of white mycelium growing on the root surface, 1-2 mm thick. The fruiting bodies are flat and multi-layered and are formed at the base of the trees. Planting tolerant rubber clones as the rootstock is the most effective management option.

Vernacular names
• Deutsch: weisse Wurzelfäule des Kautschukbaums
• English: white root disease of rubber
• Français: pourriture blanche des racine de l'hévéa