Fungicide enhancers effective for treating plants infected with fungal pathogens

A method of treating a plant or seed of a plant infected by or at the risk of infection by a plant fungal pathogen, the method comprising:

• contacting the plant or seed of a plant with a composition comprising an fungicide selected from a copper class or triazole, and an enhancer selected from N-(m-toly1)-[1, 1′-biphenyl]-4-sulfonamide, S-heptyl 2-oxo-2H-chromene-3-carbothioate, 3-(N-(4-bromophenyl) sulfamoyl)-N-(3-nitrophenyl) benzamide, or (E)-3-methyl-N′-(1-(naphthalen-2-yl) ethylidene) benzohydrazide.

A fungicide comprising:

• a copper or triazole fungicide;
• and an apyrase inhibitor in amounts sufficient to treat a fungus.

A method of treating infection by a fungal pathogen that is resistant to a copper class or triazole fungicide, the method comprising:

• contacting the fungal pathogen with a composition comprising a copper class or triazole in combination with a fungal apyrase inhibitor, wherein the fungal apyrase inhibitor prevents the fungus from at least one of detoxifying the fungicide or exporting the fungicide.