Laboratory Evaluation of Preservatives Against Brown-and White Rot Fungi

A review of current methods shows that satisfactory fungal growth, weight-loss, and strength-loss tests exist to screen large numbers of chemicals. Most countries use 3- to 4-month-long weight-loss methods for national approval of preservatives. Respirometric methods now have been developed adequately so that they should be used more widely for both screening and standard testing of wood preservatives. Selection of a test procedure should depend on the purpose of the test and the financial, equipment, and technical resources available. It must be remembered that preservative thresholds obtained in laboratory tests depend on the type of test. Thresholds for various, preservatives obtained by different methods should not be compared. In addition, laboratory testing against fungi must be used in conjunction with laboratory tests on other properties of the preservative and treated wood as well as with field and service lists before a chemical can be introduced for commercial use.

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