Using a petri plate mycelial growth rate method in the laboratory, research was conducted to determine the toxicity of Cnidium and Sophora active ingredients, applied individually or in combination, to Alternaria alternata. 采用室内平皿菌丝生长速率法研究了蛇床子和苦参有效活性成分对烟草赤星病菌的毒力及联合毒力。