Decay and termite resistances of Plato-treated timbers were evaluated using a modified JIS decay test method, feeding test in a laboratory scale and a field exposure against Reticulitermes speratus (Kolbe) or Coptotermes formosanus Shiraki. The results showed that no significant decay durability of the treated timbers although mass loss from decay slightly decreased in case of treated timbers. Treated alder and birch were drastically fed by termite in a laboratory scale feeding test. Filed trials also showed the same results as the laboratory scale test.

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