贵州省不同气候区烟草赤星病菌孢子分布研究

Research on Spore Distribution of Alternaria alternata in Different Climate Zones of Guizhou Province

为了明确烟草赤星病菌孢子产生与病害发生的关系,对贵州省主要气候区烟草赤星病菌孢子的分布情况进行了研究。结果表明,贵州省主要气候区烟草成熟期赤星病菌日均孢子密度介于0.136 9～0.389 2个/(cm2.d),不同气候区内孢子密度分布由密到疏依次为道真、开阳、兴义、天柱,孢子数的分布在贵州呈现西低、中北高的局面。各气候区田间孢子数随观察高度的增加呈指数关系减少,利用SPSS软件建立孢子数与观察高度的回归方程为:Y=0.02 X2-6.43 X+572.5。

In order to clarify the relationship between tobacco brown spot disease spores and disease occurrence, an investigation on spore distribution of Alternaria alternata in different climate zones of Guizhou province was made. The results showed that the spore density of Alternaria alternata in tobacco maturity stage was 0. 136 9-0. 389 2 spores/cm^2,and the average daily spore density distribution of the different climatic regions from dense to sparse order was Daozhen, Kaiyang,Xingyi,Tianzhu. The spore number in the western part of Guizhou province was less than the central and northern parts. The spore number decreased exponentially with height in-creasing, by SPSS software to establish a regression equation of the number of spores with the height： Y=0. 02X^2-6.43X＋572.5.