三七黑斑病初侵染来源及传播途径研究

目的：探索三七黑斑病的发生发展规律，为病害的综合防治提供依据。方法：人工接种和盆栽试验，定期观察病菌的侵染及传播途径。结果：三七黑斑病的侵染源主要来自于病种子、种苗、病残体及土壤，带菌种子、种苗是新七园的初次侵染源，残存在七园内的病残体及土壤带菌是老七园三七黑斑病的主要侵染来源；三七黑斑病主要由带病种子、种苗、病残体、土壤和病菌孢子传播。结论：对三七黑斑病的防治，应围绕防止病菌的侵染源与传播而进行，重点消灭病菌来源和封锁传播中心。

Studies on Initial Infection Sources and Channels of Black Spot on Panax notoginseng(Burk.)F.H.Chen

Objective:To probe into the occuring and developing regularities regularities of black spot on Panax notoginseng for disease control.Methods:After artificial inoculation,observation and analysis on the planting plots were conducted regularly.Results:The main infection sources include diseased seeds,seedlings,plants and soils.On the plot of new cropping,the initial infection sources are diseased seeds and seedlings while diseased plants and soils with pathogens are the main sources onplot of old cropping.Conclusion:Wiping out the infection centre and sources are the major effective means for control of black spot on P.notoginseng.