Disclosed herein is a wood preservative formulation comprising a synergistic combination of an amine oxide, an azole and a compound of formula (I), wherein said amine oxide is: a trialiphatic substituted amine oxide an N-alkylated cyclic amine oxide a dialkylpiperazine di-N-oxide an alkyldi(poly(oxyalkylene))amine oxide a dialkylbenzylamine oxide a fatty amidopropyl dimethyl amine oxide a diamine oxide a triamine oxide or any combination of any of the foregoing and wherein the azole is represented by the general formula (Z), where the substituents are as defined within the specification with the exception of the following azoles: an imidazole selected from the group consisting of: benzimidazole, thiabendazole, imazalil, carbendazim, prochloraz a 1,2,4-trazole selected from compounds of formula (XI), compounds of formula (XIII), wherein the substituents are as defined within the specification or selected from the group comprising triadimefon, triadimenol, triazbutil, cyproconazole, difenoconazole, fluquinconazole, flusilazole, uniconazole, diniconazole, bitertanol, hexaconazole, flutriafol, epoxyconazole, tetraconazole, penconazole, and mixtures thereof or mixtures of both said imidazole and said 1,2,4-triazole.
