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Larch canker (Lachnellula willkommii)
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Symptoms / species
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Impact / measures
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Pictures
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Occurrence map
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 | | Canker-like swellings on twigs, branches and stems, mostly elongated, of various size and later opening longitudinally; bordered by callus; infested crown parts with shrubby and dense branching (witches brooms), in the cankers orange colored, disc-shaped fruiting-bodies (apothecia) about 1 mm in size.
| | | Affected tree species | Larch; | | Affected parts | Stem; Shoot/Twig/Branch; |
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| On moist sites with high air humidity (depressions), epidemics favoured by light deficiency, stand density and high precipitation. Furthermore there is a relation to certain provenances of larches. The disease causes a slow dieback of twigs and branches and more rarely of the stem.
Curative measures
Curative Measures are not possible;
preventive measures:
hygienic:
remove carefully infective plant material
thinning of dense stands
afforestation only with well adapted provenances
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| Lachnellula willkommii - dieback (foto LFD Styria 2001) | | Canker on a twig with apothecia | | humid stand – heavily infested | | Fruiting bodies (apothecia) | | Canker on a twig |
 | 2011
Göriach
European larch | 2010
Rossatz
European larch | 2005
Schwarzau im Gebirge
European larch | Gößnitz
European larch | 2004
Gurk
European larch | Niederwölz
European larch | 2001
Nikolsdorf
European larch |
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