A microorganism Stephanoascus ciferrii MSBB and environment-friendly soil microbial preparations containing the same microorganism or its cultural suspension are provided to promote growth of a plant such as red pepper, and reduce occurrence of red pepper blight without harmful effects on environments. The microorganism Stephanoascus ciferrii MSBB(KACC 91297P) isolated from the forest soil increases initial growth and fruit load amount of red pepper and has antimicrobial activity against Phytophthora capsici and Bacillus anthracis. The environment-friendly soil microbial preparations contain Stephanoascus ciferrii MSBB(KACC 91297P).
