PURPOSE: An anti-plant disease composition is provided to ensure anti-fungal activity against Magnaporthe grisea. CONSTITUTION: An anti-plant disease composition which prevents plant disease caused by Magnaporthe grisea contains Lysimachia mauritiana Lamack extract, fraction of the extract, anagallosaponin IV, or anagallosaponin VIII as an active ingredient. The extract is prepared by dipping Lysimachia mauritiana Lamack in a mixture solvent of water and ethanol. The composition additionally contains agrochemically acceptable carrier, wetting agent, dispersion agent, anti-freezing agent, thickening agent, or preservative. A method for preventing plant disease caused by Magnaporthe grisea comprises a step of contacting a plant with the composition.본 발명은 갯까치수영 추출물, 갯까치수영 추출물로부터 분리한 아나갈로사포닌 Ⅳ, 아나갈로사포닌 Ⅷ 또는 아나갈리신 C를 이용한 마그나포르테 그리세아에 의한 식물병 방제제 조성물과 마그나포르테 그리세아에 의한 식물병 방제 방법을 개시한다. 상기 갯까치수영 추출물과 아나갈로사포닌 Ⅳ, 아나갈로사포닌 Ⅷ 및 데스글루코나갈로시드 B는 모두 마그나포르테 그리세아에 대해서 항곰팡이 활성을 보인다.
