Cyproconazole Products | Cleanchem - Cyproconazole is a fungicide used in agriculture to protect crops from fungal infections, particularly in cereals and other grains. It works by inhibiting the synthesis of ergosterol, a key component of fungal cell membranes, leading to the death of the fungus. Cyproconazole is effective against a wide range of fungi, including rust, powdery mildew, and fusarium. Though effective, it must be used carefully to avoid environmental contamination and to minimize resistance buildup.