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Blue stain on stored softwood

Blue stain is a bluish or bluish-gray discoloration of wood caused by certain fungi (especially various Ascomycetes ).

It is not a case of wood rot , as blue-stain fungi only feed on cellular substances (e.g. sugar , starch , protein ) and do not attack the actual wood substance. The load capacity z. B. of timber is not affected by the blue stain. Nevertheless, one speaks in this context of a wood fault . Due to the blue discoloration, the wood is visually devalued on the one hand, and on the other hand, blue fungi can damage the coating of wooden components in the exterior (e.g. wooden windows) and thus act as a precursor for subsequent wood rot. If dimensionally stable wooden components are to be given a film-forming coating, they are therefore usually first impregnated with an anti-blue stain agent .

Blue stain usually only affects the sapwood portion of the wood cross-section. The ability of the wood to absorb liquids can be considerably increased in the event of blue stain, which may have a strong effect on the impregnability .

Among the fungicides , N- trihalomethylthio compounds such as fluorfolpet , dichlofluanid , tolylfluanid and iodocarb as well as carbendazim have the best effect.


  • Heinz Butin : Diseases of the forest and park trees. Diagnosis, biology, control. 2 spore boards . 3rd, revised and expanded edition. Thieme, Stuttgart and New York 1996, ISBN 3-13-639003-2

Individual evidence

  1. Entry on anti-blueing agents. In: Römpp Online . Georg Thieme Verlag, accessed on May 29, 2014.

Web links

Wiktionary: Bläue  - explanations of meanings, word origins, synonyms, translations