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Variation in the decay resistance of larch to fungi

Abstract : * Decay resistance of larch (Larix sp.) to fungi was evaluated on heartwood samples belonging to 3 species (L. decidua, L. kaempferi and their hybrid), 3 races of European larch (polonica, sudetica and alpine), 13 wood lots (populations) and 313 trees. * Larch wood appeared, on average, as moderately durable although a high variability was observed. At the sample level as well as at the mean individual tree level, durability ranged from class 1 to 5 according to EN 350-1 standard. At the population level, larch wood varied from `durable' to `slightly durable'. Genetics played a major role in decay resistance at the species, provenance and tree levels. Environmental factors such as the position of heartwood samples and the age of trees were also identified as a source of variability. * The most durable wood was not necessarily from old native alpine stands of European larch: some young larches from faster growing lowland origins also produced durable wood. * Genetic improvement of larch wood durability appeared therefore likely by the selection of the best populations for decay resistance as well as from the selection of individuals.
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Yannick Curnel, Dominique Jacques, Notburga Gierlinger, Luc Pâques L.E.. Variation in the decay resistance of larch to fungi. Annals of Forest Science, Springer Nature (since 2011)/EDP Science (until 2010), 2008, 65 (8), pp.1-8. ⟨10.1051/forest:2008062⟩. ⟨hal-02661871⟩

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