杨树是我省四旁绿化、农田防护和用材的主要树种之一。在毛主席“绿化祖国”、“实行大地园林化”的伟大号召鼓舞下,植树造林的群众运动蓬勃开展,杨树的栽培与繁殖迅速发展。随着杨树品种和数量的增多,危害杨树的病害种类也在不断增加,而且有些病害,发生普遍,危害严重,已给生产造成了损失。 Poplar is one of the main tree species around the province greening, farmland protection and timber. Encouraged by the great call of Chairman Mao’s “greening the motherland,” and implementing “the practice of the earth garden,” the mass movement of afforestation has flourished. The cultivation and propagation of poplars have developed rapidly. With the poplar varieties and the number of increased, the types of diseases endangering poplar are also increasing, and some diseases, common, serious harm, has caused losses to production.