Ningnanmycin is primarily used as an antiviral agent in agriculture, specifically to control plant viral diseases. It is effective against a range of viruses that affect crops, such as tobacco mosaic virus, cucumber mosaic virus, and tomato mosaic virus. The chemical works by inhibiting viral replication and enhancing the plant's natural defense mechanisms, reducing the spread and severity of infections. It is often applied as a foliar spray, ensuring direct contact with infected plant tissues. Ningnanmycin is valued for its low toxicity to non-target organisms and its environmentally friendly profile, making it a preferred choice for sustainable farming practices. Its use helps improve crop yield and quality by minimizing viral damage, contributing to food security and agricultural productivity.