论文部分内容阅读
杨树是我区荒山、荒沙主要造林树种,也是农田防护林和四旁绿化的主要树种。近几年由于透翅蛾的危害,苗木、幼树以至成林大量被毁,轻者损枝折顶,重者全株死亡,成为我区绿化工作的一大障碍。根据一九七二年全省林木病虫害防治座谈会确定的协作课题,今年我们在榆林城区进行了定点观察和防治试验。现将初步结果整理如下,以供参考。
Poplar is a wasteland in our region, the main afforestation waste sand trees, but also farmland shelterbelts and greening around the main tree species. In recent years due to the hazards of the pest moth, seedlings, saplings and even into a large number of forest destroyed, the light damaged branches, heavy all die, become a major obstacle to afforestation work in our area. According to the collaborative task set by the forum on prevention and treatment of forest diseases and pests throughout the province in 1972, this year we conducted targeted observation and prevention and control experiments in the urban area of Yulin. The preliminary results are summarized below, for reference.