Lachnellula Canker
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Hagle, S.K; S. Tunnock; K.E. Gibson; and C.J. Gilligan. 1987. Field Guide to Diseases and Insect Pests of Idaho and Montana Forests. U.S. Department of Agriculture, Forest Service. State and Private Forestry, Northern Region. Missoula, Montana. Reprint 1990. Publication Number R1-89-54.
Contents |
Host
Western larch seedlings and saplings.
Distribution
Frequent in parts of western Montana; may occur elsewhere within the range of the host.
Damage
Stem and branch cankers girdle and kill tree top, branches, or entire tree.
Identification
Sunken, discolored, sometimes resinous areas of bark on stem or branch (fig. 27). Cambium is killed. A distinct margin between dead and live cambium is observed by cutting away bark. Small, cup-shaped fruiting bodies are occasionally found on dead bark within canker. These fruiting bodies are one-eighth of an inch in diameter; yellow inside and brown on the outside.
Similar damages
Other fungi can cause stem cankers on larch; fruiting is required to differentiate. Animal damage may result in girdling young trees but bark is removed by animals, whereas it remains in place with Lachnellula canker.
References
- Funk, A. 1981. Parasitic microfungi of western trees. Canadian Forestry Service, Pacific Forest Research Centre BX-X-222, 190p.
