龙胆草斑枯病发生规律及其防治研究

龙胆草斑枯病是近几年生产上发生的一种毁灭性病害。作者对该病害的发生规律和防治进行了初步研究。研究结果表明：该病菌是一种高温高湿喜光病菌。高温、高湿、裸露和低密度栽培有利病害的发生和流行。根据病害的发生规律将侵染循环分成五个阶段。只有采取种苗消毒、田园卫生、遮阴栽培和药剂防治等综合防治措施，才能取得理想的防治效果。

Studies on Occurrence Pattern of Rough Gentian Leaf Blight and Its Control

Rough gentian leaf blight was caused by Septoria gentianae. Septoria gentianae only infects the leavesof Rough gentian causing leaf blight and heavy losses. The primary infection sources of rough gentian leaf blightwere the diseased leaf residue, seed and seeding. The pathogen overwintered meinly al conidia and hypha onthe diseased residue in the flelds. It was easy to make the disease epidemic in higher temperature, humidity andday-light. Under the natural conditions, the occurrence of epidemics might be divided into five stages. By followingmethods, Rough gentian leaf blight could be controled effctively by (1) Sterilising seed and seedling with fungicide; (2)rough gentian garden sanitation; (3) sunshaing and higher density cultivation and (4) fungicide. The most effectivefungicide was Mancozeb.