榆跳象(Rhynchaenus alni Linnaeus)属鞘翅目象虫科跳象亚科,是为害榆树叶片的主要害虫之一。在天津地区,近年来为害严重。以春季为害榆树为主,每年4月中旬至6月上旬,以幼虫潜入叶肉为害,造成整株叶片枯黄,似火烧状。由于此时树势尚弱,树叶遭到为害后,对树木正常生长影响极大。据武清和汉沽的调查,发生严重时,其为害率几乎达100％。了解榆跳象的形态特征和生活习性对制定有效防治措施十分重要。为此,我们在1981年进行了观察,现分述如下: 一、形态特征成虫:体长2.5—3.0毫米。头、喙、小 Rhynchaenus alni Linnaeus (Coleoptera) is a genus of Coleoptera, which is one of the major pests that damage the leaves of elm trees. In Tianjin, serious damage in recent years. Elm-headed spring, mid-April each year to early June, the larvae sneak into the mesophyll damage, resulting in the whole plant brown, like burning fire-like. As the tree is still weak at this time, after the leaves were harmed, the normal growth of trees have a great impact. According to a survey conducted by Wuqing and Hangu, in serious cases, the damage rate was almost 100%. It is very important to understand the morphological characteristics and living habits of Elk jumping elephant to make effective prevention and control measures. To this end, we conducted observations in 1981, are as follows: First, morphological characteristics Adult: body length 2.5-3.0 mm. Head, beak, small