Armillaria root rot
- Infected trees have poor growth, dead branches in the upper canopy, browning needles, may produce an abundant crop of cones, and eventually die
- Clusters of honey-colored mushrooms may grow at the base of the tree in fall
- Flat white sheets of fungal mycelia (mycelia fans) grow between the bark and sapwood at the base of infected trees
- Thick black, shoestring-like fungal strands sometimes grow in a net on infected trees and in the soil around the base of the tree
- The base of the tree just below the soil surface may be encrusted in resin
- Wood is decayed, white, soft and stringy and may extend from the base of the tree well up into the trunk; trees frequently break or fall over in storms
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