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Giant Polypore Fungus

Symptoms

To recognise the symptoms of polypore fungus, a large golden brown fungus should be seen around the base of the tree. Even though the fungus is affecting the tree, it does not have to grow on the tree. They are quite frequently seen growing near to the trees base. The lower surface of the fungi is a creamy white colour and when the fruiting bodies are handled or damaged, they bruise a dark colour. This fungal fruiting body can grow up to 30cm in diameter and can way up to 12kg.

Cycle of infection

The fungus usually infects mature or over mature trees. This indicates that the fungus attacks the tree at any time in the year, entering through wounds. Its victims are usually Beech, Oak and occasionally Robina, but like most fungi they take time to develop inside the tree. When the fungal bodies are seen it is an indication that the fungus is flourishing.

Implications for host

The fungus attacks the roots first causing decay and on a first look it can be difficult to see the decay because the fungus hollows the roots out. This makes the tree a serious hazard, especially in high winds because it could blow over, damaging property and people. Due to the fungus attacking the roots, die back can be seen in the tree’s branches and the leaves will also grow sparsely.

Treatments

There is no treatment. The best way is to contact an Arborist and he/she will decide if the tree is unsafe. The Arborist will also remove the fungal bodies to prevent further infection from the spore. It the Arborist decides the tree has to come down, it should be burnt and the tools sterilised.

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