Laboratory and field experiments were carried out to study the resistance of Siberian elm(Ulmus pumilia L.) to the beetle(Pyrrhalta aenescens Fairmaire). The results show that the clone 65212 has a great resistance to the beetle.

• 通过室内饲养、幼树罩笼饲养、大树枝条套笼和野外调查等方法研究了白榆优良无性系65212对榆毛胸萤叶甲的抗性，结果表明，白榆优良无性系65212对榆毛胸萤叶甲致死率达93.；40%25，使幼虫发育期延长7