杨树发病诊断和防治树发病诊断和防治.doc

杨树发病诊断和防治 杨树是我国华北、东北、西北造林主要速生树种之一,由于它具有生长快和适应性强等特点,因此广为群众所喜爱。杨树作为一种常见绿地树种和短周期工业原料树种,被认为是再生工业能源最有前途的树种之一。以其造林区域广、见效快、效益高等优点被广泛推广应用。但近几年,杨树在辽宁省绿地绿色通道及速生丰产林的建设方面及栽培管理和育苗市场上存在不少问题,严重制约了杨树的产业化进程。特别是杨树破腹病严重地影响了树木生长和材质质量,致使有些地区还不敢冒然营造杨树速生丰产林。由于破腹病而引起杨树烂皮病等病虫害,大大降低了木材的经济价值,近年来,辽宁省杨树发展迅速,特别是一些杂交速生杨品种的出现,为造林主体在栽植品种选择上提供了广阔的空间。正是由于品种的门类繁杂,导致个别地区对新品种的盲目引进,由于没有做到适地适树,再加上近年来气候异常,造成一些地区速生杨树破腹病大面积发生,严重地影响着林分的生长状况、林木的材质及利用价值。 Poplar is the north China, northeast, northwest, one of the fast-growing tree of the afforestation, because it has the characteristics of growing fast and strong adaptability, so widely crowd favorite. Green poplar as one of the common tree species and short-cycle industrial raw materials species, is considered to be one of the most promising species renewable energy industry. With its afforestation area widely, quick effect, high efficiency has been widely applied. But in recent years, poplar green space green channel in liaoning province and fast-grown forest construction and management culture and seedling exists many problems on the market, seriously restricted the poplar industrialization. Especially poplar broken abdomen disease seriously affect the quality of tree growth and material and some areas also dare not presume to build fast-grown forest of poplar. Due to broken abdomen disease of poplar rotten skin disease and other diseases and pests, greatly reduces the economic value of lumber, in recent years, the rapid development of poplar in liaoning province, especially the emergence of some hybrid varieties of fast-growing Yang, as the main body in the afforestation has provided a broad space in plant species selection. Because of varieties of categories multifarious, resulting in the individual regional introduction of new species of blind, since there is no do to the optimal tree, coupled with the climate anomaly in recent years, causing some areas of fast-growing poplar break large abdominal disease occur, seriously affects the growth status of fo