药材镰刀菌性根腐病,在全国各地均有发生,寄主范围广,为害严重。1　危害及症状识别土壤中的病菌侵染幼苗根部和茎基部,病部下陷缢缩,根部皮层逐渐腐烂,呈暗色。由于根部分或全部变色腐烂,组织破坏,茎、叶因无法得到充足水分而下垂枯死。染病幼苗常自土面倒伏造成猝倒现象;如幼 Fusarium officinale root rot, occur throughout the country, host a wide range of serious damage. 1 Hazards and Symptoms Identification Germs in the soil invade the root and stem base of seedlings, the diseased part subsides and shrinks, and the root cortex gradually decays with dark color. As the root part or all of the color change decay, tissue damage, stems and leaves droop because they can not get enough water. Infected seedlings often fall from the soil caused by cataplexy phenomena; such as young