InTrans / Aug 14, 2018

Field performance of new wood preservatives in secondary timber species

The objective of this ongoing study is to evaluate the
performance of new, potential, and standard wood
preservative systems in regionally important timber
species. An important purpose of the work is to provide
information on preservative/wood species combinations
that could be used in transportation structures. Eleven
preservative systems were evaluated in this study – ACQ
Type B, Copper Citrate 2:1, CDDC, chlorothalonil/chlorpyrifos, copper-8-quinolinolate, t e b u c o n a z o l e / c h l o r p y r i f o s , R H 2 8 7 , propiconazole/chlorpyifos, copper naphthenate, CCA, and creosote. Field evaluations are being performed with
ground contact field stakes and termite-specfic testing in
Hawaii, and a laboratory soil bed test. The major wood
species used with all the systems and evaluation methodologies were loblolly pine (Pinus taeda, softwood),
northern red oak (Quercus rubra, dense hardwood), tulip
poplar (Liriodendron tulipifera, medium density
hardwood), and cottonwood (Populus deltoides, low
density hardwood). More limited evaluations (field stakes
only) are being conducted with eastern hemlock (Tsugu
canadensis), red maple (Acer rubrum), and sweetgum
(Liquidambar styraciflua). Information on the comparative treatability of these species correlated with formulation type is presented, as well as fungus cellar and termite test results. Results from the field stakes is not available yet.