不同栽培措施对龙胆草斑枯病的影响

Effects of Different Cultivation Measures on the Spot Blight of Septoria microspora Thume

[目的]研究不同栽培措施对龙胆草斑枯病的控制效果。[方法]采用病情分级计数法调查田间病残体、移栽密度、遮阴及根外追肥与龙胆草发病关系。[结果]秋季和春季收拾田间病残体并喷药保护病害可延迟发病5～10d，早期发病较轻；移栽密度为200株／m^2防效达44．2％；根外追肥防效这47．2％；采用遮阴栽培及间作可减轻发病，防效分别达56．1％、35．1％。[结论]几种栽培措施对龙胆草斑枯病控制效果显著，为无公害防治该病的基本有效措施。

[Objective] The research aimed to study the control effects of different cultivation rnsasures on the spot blight of Septoria gentianae Thume. [ Method] Using graded counting method, the relationships between the occurrnce of spot blight and diseased plants in the field, transplant density, shading and top dressing through outside root were investigated. [ Result] The results showed that the disease could be delayed 5 - 10 days or slight infection when these diseased plants in the field were collected and sprayed insecticide in autumn and spring. When the transplant density was 200 plants/m^2, the control efficiency reached 44.2%. The control efficiency of top dressing through outside root reached 47.2%. The diseased could be lightened by shading cultivation and intercropping and the control efficiency reached 56.1% and 35.1% respectively. [ Conclusion] Several kinds of cultivation measures had significant control effects on the spot blight of S. gentianae.