Cedar Laminated Butt Rot
From Bugwoodwiki
|
Contents |
Hosts
Western redcedar. (See discussion of Laminated Root and Butt Rot of other species.)
Distribution
Range of host in Idaho and Montana.
Damage
Heartrot of stem; often resulting in total cull.
Identification
The rot forms concentric rings of variously rotted heartwood (fig. 3). These
concentric rings separate easily into thin sheets. The sheets are pitted with tiny (1/16 in.) holes. Patches of brown, fuzzy mycelium are often found in the decay; when magnified they resemble tiny spears (called setae).
Similar damages
Cedar brown pocket rot is most often confused with this damage. The decay types are distinctive when examined closely.
Table Comparison of Common Root Diseases
| Fungus | Hosts | Basal Resinosus | Decay | Other Distinguishing Characteristics |
|---|---|---|---|---|
| Armillaria ostoyae | 1. DG, GF, saping pines 2. Other conifers | Yes | White or yellowish, stringy with black zone line and rhizomorphs | Thick fan-shaped felts of white mycelium in cambium |
| Phellinus
wirii | 1. DF, GF
2. Other conifers | Yes | Laminated, separating at annual rings, pitted with pinhead-sized holes | Cream-colored mycelium on outer bark of roots and root collar under duff. Cinnamon-colored mycelium often in bark cracks with cream cycelium. |
| Phaeolus schweinitzii | 1. DF
2. Other conifers | No | Brown cubical rot of root and butt heartwood | Small roots with red-brown resinous heart; galled roots; large brown, velvety conks with green or brown pore layer on underside produced on ground or base of tree. |
| Fomes
annosus | 1. DF, GF
2. SAF, WH, PP, WRC, WWP | No | White or yellowish, stringy to somewhat laminate. White pockets with black flects sometimes present | Conks shelving or flat on sides in hollow stumps. Conks have brown upper surface and white lower, pored surface with brown, non-pored margin. Cream-colored mounds (button conks) below duff on seedlings. |
| Ceratocystis wageneri | 1. PP,LPP, DF
2. ? | No | No decay produced | Black or brown stain in sapwood follows annual rings. |
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. Handbk. No. 521, 206 p.
Boyce, J. S. 1961. Forest Pathology. McGraw-Hill Book Co., New York, NY. 572 p.
Nelson, E. E., N. E. Martin, and R. E. Williams. 1981. Laminated root rot of western conifers. USDA For. Serv., For. Ins. & Dis. Leaflet 159, 6 p.
Field Guide to Diseases and Insect Pests of Idaho and Montana Forests, USDA Forest Service Northern Region, Publication Number R1-89-54
