Citrus melanose, caused by Diaporthe citri, is one of the most prevalent and important fungal diseases of citrus crops globally. However, the overuse of chemical fungicides for disease control has an adverse impact on citrus production. In contrast, biological control agents (BCAs) are environmentally friendly and have become essential tools for plant disease control. In the present study, Bacillus subtilis M23, a strain isolated from healthy citrus leaves, significantly suppressed the mycelial growth of D. citri, the causal agent of citrus melanose, in vitro. The fermentation broth of B. subt...
