Pini Rot
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Contents |
Hosts
Douglas-fir, western larch, Engelmann spruce, and pines are the most common hosts, although it is reported to infect all conifers in Idaho and Montana.
Distribution
Range of hosts in Idaho and Montana.
Damage
Heartrot of stem. Decay generally extends 2 to 3 feet above and 3 to 5 feet below each conk or punk knot. Presence of several conks or punk knots indicates complete cull.
Identification
Conks are woody with a dark, ridged upper surface and a tan pore layer on the underside (fig. 10). They range from hoof-shaped to appressed to the bark with little or no upper surface (resupinate). They are usually 2-4 inches in diameter. The context is tan or brown. Punk knots are filled with brown mycelium (figs. 11, 12). The rot first appears as a red or brown stain in the heartwood. The stain often forms concentric rings or crescents in cross section. In later stages, white pockets are distinct from the surrounding dark red or brown wood (fig. 13).
Comparison of Common Heartrots in Species Other Than Western Redcedar
| Fungus | Hosts | Shape | Upper Surface | Lower Surface | Context | Characteristic |
|---|---|---|---|---|---|---|
| Echinodontium tinctorium | 1. GF, WH
2. SAF | Hoof-under branch | Brown; woody | Tan; teeth projecting downward | Orange | Decay yellow orange, stringy |
| Phellinus pini | 1. DF, LPP,WL
2. Other conifers | Hoof or flat
on bark | Dark brown | Cinnamon to tan | Cinnamon | Stringy decay with pro-nounced white pockets, punk knots on tree stem, red-brown dis-
coloration in heartwood. |
| Phaeolus schweinitzii | 1. DF
2. Other conifers | Thick shelf or on ground; non-woody | Brown; velvety | Green-fresh; Brown-old large pored | Brown | Brown cubical decay of heartwood; thin, resinous felts some-
times in shrinkage cracks of decay. Root and butt rot |
| Fomitopsis officionalis | 1. WL,PP
2. Other conifers | Hoof or cylindric large;
chalky consistency | Yellow, white or cream | Yellow or white;pored | Yellow white | Brown cubical decay of heartwood only. Thick, white felts in shrinkage cracks of decay. |
| Fomitopsis pinicola | All dead conifers | Thick shelf or hoof;corky consistency | Brown with red "belt" along margin | Cream;small pored | Cream | Brown cubical decay of both sapwood and heartwood, dead trees and stumps |
Similar damages
In true firs or hemlock, Echinodontium tinctorium also causes a common heartrot.
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.
Kimmey, J. W. 1964. Heartrots of western hemlock. USDA For. Serv., For. Pest Leaflet 90, 7 p.
Field Guide to Diseases and Insect Pests of Idaho and Montana Forests, USDA Forest Service Northern Region, Publication Number R1-89-54
