Quintozene is primarily used as a soil fungicide to protect crops from fungal diseases. It effectively controls diseases like damping-off, root rot, and seed decay in various agricultural and horticultural plants. Additionally, it is applied to control fungal growth in ornamental plants and turfgrass. Quintozene is also utilized as a wood preservative to prevent fungal decay in timber and other wood products. Its broad-spectrum antifungal properties make it a valuable tool in maintaining plant health and protecting materials from fungal damage.