白榆优良无性系65212对榆毛胸萤叶甲的抗虫性研究

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％，使幼虫发育期延长７．３ｄ；对个体间发育影响作用大小不同，造成榆毛胸萤叶甲世代不整齐。经野外调查，６５２１２的虫口密度、树干化蛹量和叶面积被害指数均明显低于对照，其生长量明显高于对照。

Study on the Resistance of Siberian Elm Clone 65212 to Beetle

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.The beetles were fed with the leaves of 65212,the mortality of larva was 93.40% and that of the contrast 8052 was 25.81%.The clone 65212 restained the growth of larva obviously,the development period of larva was 7.36 days longer than that of the contrast with an increase of 42.73%.The 65212 had different effects to the beetle individuals, the generation development of beetle was not in a order. In the fields,the larva density and pupa quantity of beetle in 65212 were much lower than that of the contrast and the damaged index of 65212 was also much lower.