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Importance - Annosus root and butt rot is a commercially important disease of conifers. All southern pines are susceptible, but loblolly and slash pine are most severely affected.
Identifying the Fungus - Conks are often present in the litter at the base of dead or dying trees or tree stumps, or under root masses of windthrown trees. Conks, when fresh, are tan to brownish on the upper surface and white with tiny pores on the lower surface. They are rubbery and tough to tear. In the southern United States, conks are most common from December through March.
Identifying the Injury - Damage from annosus root and butt rot may be scattered throughout a stand or in pockets of dead and dying pine trees called "infection centers." Mortality is sometimes preceeded by thinning and yellowing of the crown; however, some trees simply turn red and die. Trees in various stages of dying or death may suffer windthrow. Infected roots exhibit resin or pitch-soaking, and stringy root decay.
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Pitch-soaked wood and sand
Photo by Robert L. Anderson, USDA Forest Service |
