Natural bioactive compounds for sustainable crop disease control

The growing concerns over the environmental impact of synthetic pesticides and the rise of resistant plant pathogens have intensified the search for sustainable crop protection strategies. Natural products, including plant extracts, essential oils, microbial metabolites, and their derivatives, have emerged as promising eco-friendly alternatives to conventional agrochemicals. This review synthesizes recent advances in the discovery, characterization, and deployment of these bioactive compounds for plant disease management. We explore key sources, including higher plants, beneficial microbes, and marine organisms, and detail their multifaceted modes of action, including direct antimicrobial activity, activation of plant defense mechanisms, and disruption of pathogen communication pathways. Particular attention is given to innovative formulation strategies, including nanoencapsulation and synergistic blends, that enhance stability, bioavailability, and field performance. Through case studies and examples of commercially available products, we illustrate the successful translation of laboratory research into practical agricultural solutions. We also critically assess the challenges of scalability, standardization, and regulatory compliance. Ultimately, we explore future directions for integrating natural products into integrated pest management (IPM) systems and climate-smart agriculture, highlighting their potential to enhance resilience and sustainability in global food production.