PURPOSE: An agent containing Coptis chinensis roots or extract thereof is provided effectively suppress gray mold rot and powdery mildew in strawberries. CONSTITUTION: An agent for preventing plant diseases including gray mold rot and powdery mildew in strawberries contains Coptis chinensis roots or extract thereof as an active ingredient. The extract is prepared by adding ethanol to Coptis chinensis roots or by adding water to Coptis chinensis roots, extracting at 80-120°；C using a hot water reflux device for 2-3 days, centrifuging, and decompressing the supernatant. The agent further contains sulfur and natural soap.본 발명은 황련뿌리 또는 이의 추출물을 활성성분으로 함유하는 딸기 잿빛곰팡이병 및 흰가루병을 포함하는 식물병 동시방제제를 제공하며, 상기 본 발명에 의하면 딸기 잿빛곰팡이병 및 흰가루병을 포함한 식물병을 동시에 방제 할 수 있는 효과를 제공한다.
