The first damage that occurs in coniferous wood once the tree has been felled is known as “bluing” . It is manifested by a coloration that goes from bluish gray to black in the sapwood .

When the tree is lying down, the green wood has a high content of nutritional substances, such as sugars and starches, which favors the development of these microorganisms, since they are the substances on which they feed.

The bluing is produced by a series of lower fungi called chromogenic fungi. They cannot be considered xylophagous organisms because they do not degrade cellulose or lignin.

The conditions of humidity and above all of temperature will determine the speed of development of the mycelium, of great importance since the bluish does not appear until the concentration of hyphae is great. The wood may be infested internally without being appreciated externally.

These colors reduce the quality, in aesthetic terms, of the wood and consequently limit its market and especially its price, reaching devaluations of up to 70% of its commercial value.

To avoid these attacks, a biocide must be used and the treatment carried out properly.