烟草赤星病病原菌侵染的气象条件分析

Analysis of Meteorological Condition for Infection of the pathogen of Tobacco Brown Spot(Alternaria alternate)

[目的]明确赤星病侵染与流行的适宜气象指标及其关键气象因子。[方法]对贵州省5个典型山地气候区烟草赤星病进行调查,在室内分析不同菌株间生物学特性差异;在人工气候箱内采用均匀设计法模拟不同气象条件(光照、温度和湿度),在离体叶片上采用悬滴法分析不同气候区赤星病病原菌的侵染能力差异。[结果]贵州省不同气候带的赤星病病原菌侵染率表现出一定的差异性,在湿度50%～60%、温度10～20℃即低温中等湿度条件下即可侵染烟叶,各菌株间有一定差异,但差异不大。[结论]为赤星病的流行预测和防治提供了理论依据。

[Objective] The paper was to understand the suitable meteorological indexes and key meteorological factors for infection and prevalence of tobacco brown spot.[Method] Tobacco brown spot disease in five topical mountainous climatic areas of Guizhou Province was investigated,the difference of biological characteristics of different strains was analyzed indoor;different meteorological conditions（light,temperature and humidity） were simulated in artificial climate box by using the uniform design method,and the difference of infection ability of Alternaria alternate in different climate zones was analyzed in leaves in vitro by hanging drop method.[Result] The infection rate of A.alternate in different climate zones of Guizhou Province showed certain difference.In low temperature and middle humidity（the humidity is 50%-60%,the temperature is 10-20 ℃） conditions,the pathogen could infect tobacco leaves,various strains had certain difference,but the difference was small.[Conclusion] The paper provided theoretical basis for prevalence prediction and control of tobacco brown spot.