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Armilaria mellea (Vahl) P. Kummer x fig


Crops attacked: fig .

[R]Common Names :

Root rot

Identification, Description, Biology, Epidemiology, Treatement, Possible misleading, Images

Carpophores can be seen with a naked eye.

This fungus causes rot in the living parts of the wood and leads to the decay of the tree by affecting the root system, then the collar and the base of the trunk. Under the cortex of the severely affected roots mycelial blades or white patches occur.

The fungus survives as mycelial mass in the roots and the dead wood buried in the soil. This mycelium generates rhizomorphs which may surround the roots of neighbouring trees transmitting the disease.
Infected wood can also contaminate a root by direct contact.
The basidiospores released by carpophores do not seem involved in the spread of the disease.

The fungus is present in all soils but rhyzomorph development is more frequent in alcalin soils.

Treatment is difficult because the fungus is active very deep in the soil.
Avoid high risk areas when sowing.
Remove thoroughly the old roots.
When an area is infected it may be isolated by digging a 50-60 cm deep ditch around it and fixing a protective plastic film all along the depth of the ditch.

[R]Possible misleading

[R] Images

  1. Armillaria mellea , Root rot (RIDE M., INRA)
    Root rot on plum-tree Plum-tree roots infected by root rot.

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HYP3 on line : Species (scientific name), Diseases (common names), Glossary, Crops.

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