Biofungicides: Beneficial Microbes for Plant Disease Prevention

Biofungicides are formulations of beneficial fungi and bacteria (Trichoderma, Bacillus, Streptomyces species) that colonize the rhizosphere and suppress soil-borne pathogens (damping-off, root rots, wilts) through competition, antibiosis, predation, and induced systemic resistance.

Modes of Action

1. Competitive exclusion: Form protective biofilm on roots.
2. Antibiosis: Produce antibiotic compounds toxic to pathogens.
3. Predation/parasitism: Directly attack pathogen structures.
4. Induced resistance: Prime plant’s own immune defenses (SAR/ISR).

Key Usage Rules

• Preventive only: Apply before disease onset—at seeding, transplanting, or early root development.
• Rhizosphere placement: Must contact roots (drench, furrow, seed treatment).
• Combine with sanitation: Clean tools, rotate crops, avoid overwatering.
• Compatibility: Most work with fertilizers, rooting hormones, some insecticides. Check labels.
• Shelf life: Shorter than chemicals; store cool, use within season.

Biofungicides are a cornerstone of sustainable disease management—living allies that protect roots before pathogens strike.