Role of Lichen Extracts as a Potential Source of Natural Fungicides

Plant pathogens and the diseases they cause are major to humanity. Each year, we lose more than thirty percent of crops worldwide to bacterial and fungal diseases. Lichen is a composite organism made up of two unrelated species: algae and fungi. These two components live together and behave as a single organism. When two organisms live together in this way, they provide mutual benefits to one another. They are referred to as symbionts. Lichens produce many rare secondary products not found in other plants. The uniqueness of many aromatic products sparked early chemical interest in lichen compounds. Lichens are an underutilized source of industrially important as it proven many biological activities, and yet there is much more to study about their efficacy. Lichen bioactive metabolites showed promising use in biopharmaceutical applications and for the preparation of new formulations or innovations to support human life. This review aims to summarize the research and development trends from the past and present in the bioactive fungicides against plant pathogens.