Xanthomonas spp.: Devastating Plant Pathogens and Sustainable Management Strategies

The genus <i>Xanthomonas</i> comprises devastating plant pathogens responsible for significant yield losses in globally critical crops such as rice (<i>Oryza sativa</i> L.), citrus (<i>Citrus</i> L. spp.), cassava (<i>Manihot esculenta</i> Crantz), and tomato (<i>Solanum lycopersicum</i> L.). This review synthesizes current knowledge on the molecular mechanisms driving <i>Xanthomonas</i> pathogenicity, including the type III secretion system (T3SS) that translocates effector proteins, transcription activator-like effectors (TALEs) that reprogram host transcription, and extracellular polysaccharides (EPS) that promote biofilm formation and immune evasion, which collectively enable host colonization, immune suppression, and disease progression. Rapid adaptation through genomic plasticity and horizontal gene transfer (HGT) exacerbates challenges in disease management by facilitating evasion of host defenses and environmental stressors. Economically, <i>Xanthomonas</i> spp. inflict billions in annual losses through crop damage, trade restrictions, and eradication efforts, disproportionately affecting resource-limited regions. Emerging antibiotic resistance and climate-driven shifts in pathogen distribution further threaten food security. Sustainable strategies, such as CRISPR-based genome editing to disrupt susceptibility genes, biocontrol agents (e.g., <i>Bacillus</i> and <i>Pseudomonas</i> spp.), and nanotechnology-driven antimicrobials offer promising alternatives to conventional copper-based and chemical controls. This review underscores the urgent need for integrated, climate-resilient management approaches to mitigate the ecological and socioeconomic impacts of <i>Xanthomonas</i> diseases, bridging genomic insights with innovative control measures, to address escalating threats posed by these pathogens in a changing global climate.