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BEHAVIOR TO THE WOOD BIODETERIORUM OF PINE RADIATA (Pinus radiata D.Don) TREATY WITH COPPER-AZOL (CA-B), AGAINST PUDDING FUNGI AND UNDERGROUND TERMITE
Radiata pine wood, main logging resource of Chile, is of low durability so it must be treated to extend its useful life. Fungus and insects, among other factors of its deterioration, are usually the most relevant. Particularly the subterranean termite, "Reticulitermes flavipes" represents a growing concern for its permanent progress in populated areas of the country.
Chromium copper arsenate, CCA was the most used preservative for decades around the world, however, environmental concerns, more than ten years ago, led to a shift towards other products. Use of Copper-Azols (CA) and specifically of type B and the micronized Copper-Azol, have been the most relevant changes since then, what has also happened in our country. Its introduction, however, has been very slow, basically by cost and because there is not a legal frame to regulate the treated wood use with CCA.
Based on cost of preservative CA-B and the requirements of Australian Standard®, AS 1604.1-2012 to treated wood with the preservative, the target of this study was to evaluate the behavior of Radiata pine treated with CA-B, with lower retentions that the required by the Chilean Standard against the attack of rot fungi and subterranean termite.
Used methods were the “Standard Test Method for Wood Preservatives by Laboratory Soil-Block Cultures” described on the ASTM Designation: D1413 - 07ɛ1 and the Chilean Standard NCh 3060.Of 2007 for the study with fungi and subterranean termite respectively.
All the specimens treated with CA-B presented significant differences compared to the control specimens, against the attack of Lentinus lipideus. Against the attack of Coriolus versicolor only retentions of 1.4 and 1.8 kg / m3, showed significant differences regarding the control test pieces.
In the study against subterranean termite, the necessary retention of CA-B for the control of Reticulermes flavipes was between 1.4 and 1.8 kg / m3, it equivalents to what is required by the Chilean Standard. A lower retention in radiate pine treated with CA-B, could not be validated for control of subterranean termites, Reticulermes flavipes.