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前言郑州市黄河游览区营造了以杨、柳、榆、侧柏为主的四旁绿化树木二十多万株,对美化游览区和改造生态环境,起到了极大的作用。但是随着人工林的增加,苗木长途调运,检疫不严,加上栽培管理不善,目前病虫害发生十分严重,据统计,黄河游览区现有杨、柳、榆树六千多株,其中,杨、榆树五千多株,柳树三百余株。根据八六年五月九日调查所知,柳树被天牛危害株率达100％。被害的新虫孔,单株最多的达23个,少的也有2—3个,平均单株有虫孔
Preface The Yellow River tourist area in Zhengzhou has created more than 200,000 green trees on four sides with Yang, Liu, Yu and Platycladus orientalis as its mainstay, which plays a great role in beautifying tourist attractions and rebuilding the ecological environment. However, with the increase of plantations, long-distance transportation of seedlings and lax quarantine, coupled with poor cultivation and management, the current pest and disease occurrence is very serious. According to statistics, there are over 6,000 poplar, willow and elm trees in the Yellow River tourist area. Among them, More than 5,000 elm trees, more than 300 willow trees. According to a survey conducted on May 9, 1986, the willow trees damaged by the celastrus could reach 100%. The new hole was killed, up to 23 per plant, there are also less 2-3, the average per plant hole