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La madera de Pinus sylvestris tiene interes comercial aunque su valor se reduce considerablemen-te cuando presenta hongos de azulado. En el presente estudio se apearon siete pinos procedentes de plantaciones espanolas, y de los fustes se muestrearon 14 rodajas a diferentes alturas. Cuando estas estaban parcialmente azuladas se labraron para obtener probetas pequenas sin defectos anatomicos, sobre las que se determino la densidad y ademas la estabilidad dimensional en volumen y en las tres dimensiones principales de la madera. En cada rodaja se compararon las propiedades fisicas de las probetas completamente azuladas y las no azuladas, mediante el analisis de la varianza con un factor. El metodo permitio analizar la influencia especifica del azulado eliminando otras fuentes de varia-cion: factor arbol, altura en el fuste, anchura de anillos, presencia de albura y edad cambial. Solo en algunas rodajas la madera azulada de pino silvestre resulto significativamente diferente en densidad y contraccion axial (madera azulada un 1% mas densa y con la contraccion axial un 13% mayor). Abstract Pinus sylvestris timber is commercially important, but its value is considerably decreased by the effects of blue stain fungi. Seven pine trees from Spanish plantations were felled for the study, and 14 discs were sampled from different heights in their stems. When the discs showed partial discoloura-tion due to fungal infection, they were cut to produce small defect-free specimens for determining density and dimensional stability (in volume and in the three main dimensions of wood). The phy-sical properties of fully stained and stain free specimens were compared, in each disc, by one-factor analysis of variance. This method enabled analysis of the specific influence of the blue stain fungi while avoiding other sources of variation: tree factor, height in the stem, ring width, presence of sapwood and cambial age. However, the only significant differences between discoloured and uns-tained wood were in the density and axial shrinkage, in some discs (the density of the blue-stained wood was 1% higher and the axial shrinkage 13% higher than in the unstained wood).

Influencia del azulado (mancha azul) en la densidad y estabilidad dimensional de la madera de Pinus sylvestris