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