Cedar Brown Pocket Rot

Poria sericeomollis (Rom.) Engel.

From: Field Guide to Diseases and Insect Pests of Idaho and Montana Forests, USDA Forest Service Northern Region, Publication Number R1-89-54

Hosts. – Western redcedar.

Distribution. – Range of the host in Idaho and Montana.

Damage. – Heartrot of the stem; often producing total cull.

Identification. – The rot occurs in irregular, large patches several inches to several feet in length throughout the stem. Each patch may be one to several inches in diameter (fig. 4). In the early stages of development, the patches of decay are yellow to light brown and often vague, but in late stages they become distinctly brown with cubical cracking (fig. 5). Conks of this species are rare. They are indistinct, thin, white pore layers produced directly on the bark of dead trees.

Similar damages. – Phaeolus schweinitzii produces a brown cubical rot of cedar heartwood. It is a butt rot which usually occurs in a single, tapering column in the center of the butt. Phellinus weirii produces a brown laminated butt rot with tiny pits in the decayed wood.

References.

Anonymous. 1982. For. Insect & disease identification and management. USDA For. Serv., Northern Region; Idaho Dept. of Lands, Insect and Disease Control; Montana Dept. of State Lands, Division of Forestry. 192 p.

Boyce, J. S. 1961. Forest Pathology. McGraw-Hill Book Co., New York, NY. 572 p.

Hepting, G. E. 1971. Diseases of forest and shade trees of the United States. USDA For. Serv.Ag. Hndbk. No. 386, 658 p.

[  Back  ]