The Use of Biochar for Plant Pathogen Control

Area of Science:

• Agricultural Science
• Environmental Science
• Plant Pathology

Background:

• Growing demand for sustainable, nonchemical plant disease control strategies.
• Biochar, derived from organic waste, is a soil amendment with potential pathogen-suppressive effects.
• Need for comprehensive understanding of biochar's mechanisms in plant disease management.

Purpose of the Study:

• To review the pathogen-suppressive effects of biochar as a soil amendment.
• To elucidate the diverse mechanisms by which biochar controls plant diseases.
• To assess biochar's potential in integrated pest and disease management.

Main Methods:

• Literature review of studies on biochar's effects on plant pathogens (fungi, oomycetes, bacteria) and pests (nematodes, insects).
• Analysis of biochar's impact on soil properties, root exudates, and soil microbiota.
• Examination of biochar-induced plant defense responses, including hormonal signaling.

Main Results:

• Biochar suppresses fungal pathogens by altering soil properties, nutrient availability, and promoting beneficial microorganisms.
• It induces systemic plant defenses, activating stress-hormone responses and affecting active oxygen species.
• Biochar also impacts oomycetes and bacterial pathogens by modifying soil microbiota and inducing plant defenses; it suppresses nematodes and insects via similar mechanisms.

Conclusions:

• Biochar is a promising, eco-friendly soil amendment for integrated plant disease and pest management, aligning with circular economy principles.
• Its effectiveness relies on complex, pathogen-specific modes of action.
• Tailoring biochar type and application regimes to specific pathogens and local conditions is crucial for optimal results.