This study tested six common essential oils (from oregano, thyme, cinnamon, clove, rosemary, and basil) to see if they could stop five types of fungi that spoil bananas after harvest. Thyme oil worked best, completely stopping fungal growth at the highest concentration tested. Cinnamon and oregano oils also worked well at moderate concentrations. These natural oils could replace synthetic fungicides and help keep bananas fresher longer during storage and transport.