Lachnellula Canker - Field Guide to Diseases and Insect Pests of Idaho and Montana Forests

Lachnellula Canker

Lachnellula flavovirens (Bres.) Dennis

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

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.
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Figure 27 - Lachnellula Cankers
often cause top kill of larch saplings.

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.

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