Decay evaluation of the effectiveness of an LOSP envelope treatment in Eucalyptus regnans heartwood

The penetration of a light organic solvent preservative (LOSP) into Eucalyptus regnans F. Muell. heartwood was examined using a fungal bioassay that allowed infection of the blocks only through their lateral surfaces. Boards (2 m long) were treated, blocks cut from them, and the freshly cut end grain sealed with epoxy. Some blocks had 2 mm of surface wood (treated envelope) shaved off. Most unshaved blocks resisted decay, with only 1 block out of 100 having a mass loss greater than 1.5 percent. However, almost half of the shaved blocks had decay, indicating limited penetration of preservative past the depth of 2 mm. Treated shaved blocks had less decay than untreated shaved blocks. There was little difference in performance between blocks cut from different positions along the original 2-m boards.

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