Projet Forrisk : Etude des attaques de fomes sur le douglas dans le Tarn

Abstract : Fomes (Heterobasidion annosum, sl) causes severe damage to forests in many countries. It has long known the severe losses that may result in spruce stands. Foresters are afraid of its current expansion and the damage it can cause to trees that have supplanted as Douglas-fir. The project FORRISK was an opportunity to clarify its impact on this species. The aim of this study is to improve the diagnosis of the presence of the fungus in the event of dieback. For this, the visible signs of dieback at the crown condition were studied and put in links with the presence of discoloration of wood at the stem or damage on roots. Following a stumping and shelling, we tried to understand the dynamics of colonization of the root and wood by the fungus and the damage it causes to the root system. The correlation between health status and presence of crown discoloration at the stem has not been established. The presence of the fungus in the timber does not disturb to the physiological state of the tree. Next, we saw that fomes is ubiquitous because 60% of the strains studied showed alteration tasks. While in Douglas, this fungus causes yet little economic impact on the degradation of wood, it is essential to better understand its effect on the root system. On the 11 strains studied, 71% roots observed were infected by fomes. However, woody roots of a tree have three main roles: the mechanical ground anchor, storage of reserves and the conduction of water containing minerals. Damages due to Heterobasidion likely have a negative impact on these three functions which causing a general weakening of the tree.
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Master thesis
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http://docnum.univ-lorraine.fr/public/BUS_M_2014_LAGET_LUCILE.pdf
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Lucile Laget. Projet Forrisk : Etude des attaques de fomes sur le douglas dans le Tarn. Sciences de l'environnement. 2014. ⟨hal-01837104⟩

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