Pouch Fungus - Field Guide to Diseases and Insect Pests of Idaho and Montana Forests

Pouch Fungus

Cryptoporus volvatus (Pk.) Shear

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

Hosts. – Dead conifers.

Distribution. – Range of hosts.

Damage. – Causes a rapid decay of sapwood in bark beetle-attacked trees. Minimal volume loss usually results because most of the decay is removed in cutting the cant.

Identification. – Rounded, white or tan conks which are about one inch in diameter form on the outer bark of infected trees (fig. 9). The conks emerge through holes in the bark produced by bark beetles within 1 to 3 years of the bark beetle attack. The conks are leathery at first and totally scaled with an air space and a pink pore layer inside. At maturity the conks have a hole in the underside about one-eighth to one-fourth of an inch in diameter. New conks may be produced on a dead tree each year for up to 3 years. Conks live only one summer and deteriorate on the tree within a year or two.

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Figure 9. - Pouch Fungus fruits through
bark beetle emergence holes.

Similar damages. – Immature conks of F. pinicola sometimes resemble C. volvatus conks; however, F. pinicola conks are hard or corky and solid throughout. Numerous other saprots occur in dead conifers in Idaho and Montana. They will generally not be discernible from C. volvalus rot unless conks are present.

Link to Images in Forestry Images

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.

Bega, R. V. 1978. Diseases of Pacific Coast conifers. USDA For. Serv. Ag. Hndbk. No. 521, 206 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.

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