茄子黄萎病发生与土壤接菌量的关系

Relationship between incidence of Verticillium dahliae wilt of eggplant and the amount of microsclerotia in soil

结果表明，土壤接菌量与茄子黄萎病的发生及流行关系密切，接菌量大于３００ ｇ·株－１ 时，发病重；接菌量小，发病轻．土壤中微菌核的数量与地上部发病的程度呈正相关．一般重病茄田土壤中微菌核的数量，较轻病田及零星病田为高．茄子生长期茄株维管束变色株率，随接种量的增加而增加。

Indicated is the close relationship between density of propagules of V.dahliae in soil and disease incidence and severity. When the culture material of V.dahliae is more than 300 g/l plant the disease is severe,and when it is lower than 300 g/l plant,the disease developed slowly.Experiment of minitoring pathogen inoculum in soil sample indicated the amount of microsclerotia in soil and the disease incidence is positively correlated.The amount of microsclerotia in heavily infested field is higher than that in light infested field.The incidenace of plant vascular discoloration is not only increased with the soil inoculum density,but also postively correlated with disease incidene in the growth period.