Bacillus subtilis fungicide is a plant growth-promoting rhizobacterium (PGPR) that enhances plant resistance to biotic and abiotic stresses through systemic resistance, biofilm formation, and lipopeptide production. Applied as a soil drench, it outcompetes pathogenic microbes, boosting plant health and acting as an organic root enhancer. When sprayed on foliage, the spores compete with pathogens and lipopeptides disrupt pathogen growth and germination.