Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous > Buckeye > Fungi growing on trunk
Buckeye > Trunk/branches > Fungi growing on trunk
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Ganoderma root and butt rot
Ganoderma applanatum
- Leaves are small, turn yellow and drop prematurely
- Canopy appears thin with few leaves and multiple dead branches
- Fungal conks, semicircle shelf fungi, can be found from the base of the tree up to 3 feet high on the trunk
- Conks are reddish brown and shiny on top, white and porous underneath, a rim of white may be visible on the edge of the growing conks
- Infected wood at the base of the tree is white, soft, stringy or spongy
- Infected trees frequently break or fall over in storms
- More information on Ganoderma root and butt rot
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Armillaria root rot
Armillaria spp.
- Infected trees have poor growth, dead branches in the upper canopy, undersized and/or yellow leaves
- Flat white sheets of fungal growth (mycelial fans) between the bark and sapwood at the base of infected trees
- Thick black, shoestring-like fungus can sometimes be seen under the bark, around roots and in the soil around the base of the tree
- Wood is decayed, white, soft and spongy; this may extend from the base of the tree well up into the trunk
- Trees frequently break or fall over in storms
- Clusters of honey-colored mushrooms may grow at the base of the tree in fall
- More information on Armillaria root rot
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Heart rot
Polyporus squamosus and Oxyporus populinus
- Fungal fruiting bodies arise along the stem, near a pruning wound, crack or other wound
- Many shapes and sizes of fungal bodies may be seen
- Polyporus fungi produce mushrooms 12" or more across, yellow-tan above with a short dark stalk
- Oxyporus may be a white corky mass of fungal growth or a thick white shelf fungi 6" across, often covered with green moss
- The canopy may show no symptoms or may have small yellowing leaves or dead branches depending on the extent of the trunk decay
- In cross section of the trunk, the wood at the center is discolored, soft, crumbling, stringy or spongy
- More information on heart rot