一、引言树木对病原物的抵抗能力称为抗病性或感病性。抗病性和感病性是同一事物的两个方面。不同种的树木对一种病害的反应是不同的,有的表现为抗病的,有的表现为易感的。即使在同一个树种中,有时发现不同的植株之间,抗病性也有差异。树木的抗病性是在长期的系统发育过程中形成的。特别是栽培树种,抗病能力的形成更受人类栽培活动的影响。我国的板栗品种大多具有抵抗栗疫病的能力。我国的榆树对欧美流行的榆枯萎病也是抗病 I. INTRODUCTION The tree’s resistance to pathogens is called resistance or susceptibility. Disease resistance and susceptibility are two aspects of the same thing. Different types of trees respond differently to a disease, others are disease-resistant and others are susceptible. Even in the same species, it is sometimes found that there are differences in disease resistance between different plants. The disease resistance of trees is formed during long-term phylogenetic development. Especially the cultivation of species, the formation of disease resistance is more affected by human cultivation activities. Most of China’s chestnut varieties have the ability to resist chestnut blight. The elm in China is also resistant to the blight that is endemic to Europe and the United States