Abstract
Essential oils, extracts and chemical components from aromatic plants are widely used as flavors and fragrances by the food and cosmetics industries because they act highly effective against plant pathogens and pests. According to recent research studies, some botanicals derived from higher plants are efficient insecticides against particular pests, and fungicidal against necrotrophic and biotrophic plant pathogens, in addition to their use in food production. Towards substituting synthetic insecticides/fungicides with natural substitutes, which do not carry negative health effects, the essential oils, extracts and chemical components of Curcuma species have been examined against various plant pathogens and insect pests that harm food crops. The present review discusses the efficacy of essential oils, extracts and few main components derived from a wide range of Curcuma plants against a wide variety of pests and pathogens of food crops. In addition, their mechanism of action against insects and plant pathogens as well as their potential impact on crops (i.e. the allelopathic nature) are discussed. Finally, the commercialization of Curcuma-based pesticides is reviewed and challenges and knowledge gaps are highlighted.
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