植物检疫包括对内和对外两部分,它们应该是密切结合而不可分的。在我国由於这两方面的基础都非常薄弱,所以,一种新的危险性病虫害我们常常没有能力阻止输入,而一经输入之后又没有能力阻止它迅速地传布蔓延;甘薯黑斑病便是个例子。在反动统治时代,我们不 Phytosanitary, including both internal and external components, they should be closely integrated and inseparable. In our country, because of the very weak foundation of both, we are often unable to stop a new kind of dangerous pest and we can not stop it from entering and spreading once it is imported. Sweet potato black spot is an example. In the era of reactionary rule, we do not