大叶含笑Michelia fallaxa Dandy(木兰科)和苦木Picrasma quassioides(D.Don)Benn(苦木科)是我省官山自然保护区珍贵乡土树种。这两个树种人工造林后,1979、1980年发现有长足蟓危害主干和侧枝,危害率62—73%,严重影响该树木的生长。长足蟓属鞘翅目Coleptera,蟓虫科 Michelia fallaxa Dandy and Picrasma quassioides (D.Don) Benn (Myrtaceae) are rare native species of Guanshan Nature Reserve in our province. After the artificial afforestation of the two tree species, in 1979 and 1980, they were found to be harmful to the trunk and side branches with the harm rate of 62-73%, seriously affecting the growth of the tree. Coleptera is a genus of Coleptera, Eupolyphaga