Fungicide. Primarily an oomycete fungicide although it has some activity against ascomycetes and basidiomycetes. The product acts by disruption of the microtubule structure and inhibition of cell division. The mechanism for this activity is through the covalent binding of the active ingredient to beta-tubulin in the cytoskeleton. Scanning microscopy studies showed zoxamide action against blight on potato crops begins after germination, achieving inhibition of hyphal development and sporangia production. This novel mode of action makes zoxamide an important new tool in antiresistance strategies. Can be used as a reference compound.