The 8-hydroxyquinoline copper complex is widely used as a fungicide in agriculture to protect crops from fungal infections. It is particularly effective against diseases like downy mildew and blight in fruits, vegetables, and ornamental plants. In addition, it serves as a wood preservative, preventing fungal decay and extending the lifespan of timber products. The complex is also utilized in the manufacturing of antifouling paints for ships, where it inhibits the growth of algae and marine organisms on hulls. In the pharmaceutical industry, it has been explored for its antimicrobial properties in certain medicinal applications, such as topical treatments for fungal skin infections.