Performance of surface-treated hardwoods and softwoods out of ground contact

IRG/WP 3592

T L Highley

A number of fungicides were tested as brush treatments for protection of southern pine, Douglas-fir, maple, and red oak against decay above ground. Cross-brace and L-joint test units were treated just before assembly and exposed from 3-10 years. Untreated Douglas-fir cross-brace units were not decayed at either the Mississippi or Madison, WI, site. Untreated red oak cross-brace units were not decayed at the Madison site. The two hardwood species were more difficult to protect from decay than the softwood species. Decay development in maple cross-brace units was considerably slowed by several of the treatments but none of the treatments provided complete protection from decay during the 9 or 10 years exposure in Mississippi. Most of the treatments did not reduce decay development in red oak cross-brace units. Many treatments protected pine cross-brace units. The L-joints were exposed for only 3-4 years, but appear more difficult to protect from decay than the cross-brace units.


Keywords: BRUSHING; HARDWOODS; SOFTWOODS; FIELD TESTS; L-JOINTS; OUT-OF-GROUND CONTACT; USA; MADISON; MISSISSIPPI; IN-SITU TREATMENTS; SOUTHERN PINE; PSEUDOTSUGA MENZIESII; ACER SACCARUM; QUERCUS

Conference: 90-05-13/18 Rotorua, New Zealand


Download document (460 kb)
free for the members of IRG.

Order document from secretariat