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川芎(Ligusticum chuanxiong Hort.)是四川省特产药树之一。川芎块茎腐烂病发生普遍而严重。 1 症状该病在川芎整个生长期均可发生。发病初期,心叶首先变黄,根系部分或全部变褐色,随着病害的发展,植株完全停止生长,叶片从叶尖、叶缘逐渐焦枯,须根开始腐烂。其后地上部茎叶全部发黄且大部分叶片焦枯,块茎腐烂,10～11月发病较重,栽培管理粗放、施用氮肥过多、排水不良和连作的田块发病较重。 2 病原菌
Chuanxiong (Ligusticum chuanxiong Hort.) Is one of the special medicinal trees in Sichuan province. Chuanxiong tuber rot disease common and serious. 1 Symptoms The disease can occur throughout the growth of Chuanxiong. Early onset, the heart of the first yellow, some or all of the root brown, with the disease development, the plant stopped growing, the leaves from the tip, leaf edge gradually scorched, fibrous roots began to decay. Afterwards, all shoots were yellow and most of the leaves were scorched and tuber rotted. The incidence was heavier from October to November. The extensive cultivation and management, too much nitrogen fertilizer, poor drainage and continuous cropping were more serious. 2 pathogens