乌头(Aconitum carmichaeli Debx.)为毛茛科植物,其侧生子块根又称附子,是一种重要中药材。上海郊区栽种已有多年历史。近年来常发生乌头花叶病害,其主要症状:系统花叶,叶片出现褪绿和黄斑,叶片变小、皱缩,有的叶片基部和叶柄出现坏死梭状条斑(图1)。植株明显矮化。侧生子块根很小,染病严重的则停止生长(图2)。据田间调查, Aconitum carmichaeli Debx. Is a Ranunculaceae plant, its lateral root tuberous root, also known as aconite, is an important Chinese herbal medicine. Shanghai suburbs have been planted for many years. Occurred in recent years, aconite mosaic disease, the main symptoms: the system of mosaic, leaf chlorotic and macular discoloration, leaf smaller, shrinkage, and some leaves at the base and petiole necrosis spindle plaque (Figure 1). Plant dwarf obviously. Side of the child is very small roots, disease is serious stop growing (Figure 2). According to field surveys,