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.
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 (for example, replacing the phosphate backbone of DNA.)
^Gisi U, Sierotzki H,Cook A, McCaffery A (2002): Mechanisms influencing the evolution of resistance to Qo inhibitor fungicides. Pest Management Science 58: 859–867. 
^Klix MB, Verreet J-A, Beyer M (2007): Comparison of the declining triazole sensitivity of Gibberella zeae and increased sensitivity achieved by advances in triazole fungicide development. Crop Protection 26:683-690.