ESTIMATION OF DAMAGE TO BLACK PINE WOOD (PINUS THUNBERGII PARL.) CAUSED BY MATSUCOCCUS THUNBERGIANAE MILLER AND PARK

Abstract

A study was conducted to evaluate differences of sound and damaged wood (Pinus thunbergii Parl. by Matstucoccus thunbergianae Miller and Park) in order to determine whether damaged trees could be utilized as a general black pine material. The quantity of 1% NaOH extraction was almost the same between damaged and sound woods. There was no difference in cell size and cell wall thickness between damaged and sound woods. Cell count per annual ring in damaged trees was less than that of sound trees. There was a little difference in longitudinal resin canal count per area between damaged and sound trees, but longitudinal resin canal count per annual ring in damaged wood was almost two times higher than that in sound trees. The shrinkage ratio in damaged wood was higher than that in sound wood. The width of annual ring in damaged wood was denser than that of sound wood, but the ratio of late wood had no difference between damaged and sound woods. There was only a little difference in the three types of mechanical properties (bending, compression and shearing methods) between damaged and sound woods.