European test methods (EN) with termites have been compared with long-standing experience from screening test methods in the laboratory of Eberswalde. The results are discussed in terms on the possibility of using screening test methods as the first laboratory evaluation of new active substances in wood preservatives. The advantages and disadvantages of these methods are considered. Only a small amount of the active substance is necessary for a screening test and the results can be evaluated earlier, but screening tests also can provide additional information of value in the determination of preservative potential. The relationships between the determination of toxic properties for new biocides by screening test methods and the definition of the toxic value by standard laboratory methods are shown.

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