为改变西北地区人工林以杨、柳为主,招致星天牛及腐烂病等日益严重的局面,宁夏已将榆树列为混交林营造树种之一。作者近年对本区重要榆树害虫作了饲养观察,现就其中国内报道较少的几种简介如下(形态部分详见封三): In order to change the growing poplars and willows in northwestern China, the increasingly serious situation of Asteroid Beetle and decayed diseases, etc., Ningxia has listed the elm trees as one of the tree species in the mixed forest. In recent years, the author made observations on the major elm tree pests in this area, and the following are some of the few reports that are reported in China.