Screening for fungicidal activity represents the first step in searching for new active components with enhanced environmental profile in comparison with traditional wood preservatives. Diazenes, their salts, and the salts of the corresponding semicarbazides, as well as several complexes of boron, were screened for fungicidal activity against wood decay fungi Trametes versicolor, Coniophora puteana and Poria monticola. Activity was exhibited by two diazenes and two salts - tetrafluoroborates. Efficacy of both tetrafluoroborate derivatives was additionally confirmed by a mini-block test. In comparison with diazenes, substances from the group of boron complexes with 1,3-dicarbonyl compounds showed enhanced fungicidal activity.

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