Researchers created tiny nanocarriers made from natural biopolymers that can deliver carvacrol, a natural antimicrobial compound from oregano and thyme, to protect tomatoes from fungal rot after harvest. These nano-sized delivery systems were more effective than the unencapsulated carvacrol at fighting three common postharvest fungal pathogens. The treatment is safe and could offer a sustainable alternative to conventional fungicides for keeping harvested tomatoes fresh longer.