杨树是用材林、防护林和四旁绿化的主要树种,杨树已成为辽宁省海城市农村致富的支柱产业之一。随着种植面积的不断扩大,由于树种单一、林相单纯和新造林出现经常引起大面积病虫害暴发,在一定程度上制约杨树产业发展现状。 Poplar is a timber forest, shelterbelts and surrounded by greening the main tree species, poplar has become the city of Liaoning Province, Haicheng, one of the pillar industries in rural areas. With the continuous expansion of planting area, due to the single species, simple forest and new afforestation often cause large-scale outbreaks of pests and diseases, to a certain extent, restrict the development of poplar industry status quo.