木香根腐病发生及其危害的调查研究

通过对重庆南川木香主产区内根腐病的调查,结合不同环境条件进行分析,初步得出木香根腐病的发生与海拔高度、地势高低、土壤类型、耕作制度及管理水平等密切相关.在土壤含水量高、排水不畅的粘土地块,根腐病发生严重.特别是连作田,随着连作时间的延长,病害发生加重.此外,根据发病率、病情指数与木香产量损失率之间的关系研究发现,移栽的第2年(3年生)根腐病发病明显,建议此时进行综合防治以减少木香产量的损失.

Surveys on Root Rot of Aucklandia Lappa Decne.

Through the investigation of root rot of Aucklandia lappa Decne. in Nanchuan, combined with different environmental conditions, it is concluded that the root rot is closely related to altitude, topography, soil type, farming system and management level, and so on. In the clay plots where the soil moisture is high and the drainage is not smooth, the disease occurs seriously, especially in the continuous cropping field, the disease is aggravated with the continuous cropping time. In addition, according to the relationship between the incidence rate, the disease index and the yield loss rate, it has been found that the incidence of root rot in the second year of transplanting (3 years old) was significantly increased. It is suggested that integrated control should be carried out at this time.