In presented paper we examined on biotic properties of novel structure of tebuconazole derivatieves: tebuconazole hydrochloride, allyltebuconazole chloride, methyltebuconazole iodide, tebuconazole dihydrocitrate. Our investigation against wood-degrading fungi were contained also the didecyldimethylammonium 3-aminotriazolate as well as didecyldime-thylammonium nitrate(V) with tebuconazole or with (tebuconazole + propiconazole). In order to confirm the structure of the new ionic liquids analyses using thin layer chromatography and proton and carbon spectra of nuclear magnetic resonance were carried out, as well as elementary analyses CHNO. The most active compound against brown and white rot fungi were precursor of ionic liquids- tebuconazole hydrochloride . The fungistatic dose (ED50) for Coniophora puteana reached 0.1 ppm, the fungitoxic dose (ED100) - 5 ppm and lethal dose (LD) - 5 ppm. The fungicidal value of didecyldimethylammonium nitrate(V) with tebuconazole for Coniophora puteana were < 0.73kg/m3 , for Trametes versicolor ranged from 0.81 kg/m3 to 1.76 kg/m3 The investigation of protic triazole-based ionic liquids demonstrated the strongest action against blue stain and mould fungi. The growth of mycelium on the surface of wood samples was inhibited in the amount of application 15 g/m2. The penetration depth into Scots pine wood Pinus sylvestris L. of didecydimethyl-ammonium nitrate(V) including the tebuconazole was reached 6.2 mm.

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