posaconazole and triazole plant-protection fungicides include epoxiconazole, , myclobutanil, propiconazole, prothioconazole, metconazole, cyproconazole, tebuconazole, flusilazole and paclobutrazol. Due to spreading resistance of plant pathogens towards fungicides of the strobilurin class, control of fungi such as Septoria tritici or Gibberella zeae relies heavily on triazoles. Food, like store bought potatoes, contain retardants such as triazole or tetcyclacis. In addition, paclobutrazol, uniconazole, , and triadimefon are used as plant growth retardants. Brassinazole inhibits brassinosteroid biosynthesis. Importance in chemical synthesis The azide alkyne Huisgen cycloaddition is a mild and selective reaction that gives 1,2,3-triazoles as products. The reaction has been widely used in bioorthogonal chemistry and in organic synthesis. Triazoles are relatively stable functional groups and triazole linkages can be used in a variety of applications, e.g. replacing the phosphate backbone of DNA. Related heterocycles Imidazole, an analog with two nonadjacent nitrogen atoms Pyrazole, an analog with two adjacent nitrogen atoms Tetrazole, an analog with four nitrogen atoms Triazolium salts, substituted analogues that can be used as NHC precursors External links Synthesis of 1,2,3-triazoles (overview of recent methods) Synthesis of 1,2,4-triazoles (overview of recent methods) References Chemical compounds Simple aromatic rings Triazoles