Fenhexamid is primarily used as a fungicide in agriculture, especially in the control of Botrytis cinerea, commonly known as gray mold. It is highly effective in protecting fruits, vegetables, and ornamental crops, with significant use in vineyards for managing bunch rot in grapes. The compound works by inhibiting fungal sterol biosynthesis, specifically targeting the 3-ketoreductase enzyme, which disrupts cell membrane formation in sensitive fungi. It is often applied as a foliar spray during flowering and fruit development stages due to its preventive and curative properties. Fenhexamid shows strong performance under cool and humid conditions, where gray mold pressure is high. Because of its specific mode of action, it is considered suitable for integration into resistance management programs, especially when rotated with fungicides from different chemical groups. The solution formulation allows for easy mixing and uniform coverage on plant surfaces, enhancing efficacy. It is valued for its low toxicity to beneficial insects and favorable environmental profile when used according to label instructions.