Table 2. –
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. |
