论文部分内容阅读
欧美杨溃疡病是近几年来在华北地区杨树上发生的一种新型枝干病害,目前呈扩展态势;调查发现,中林46杨较欧美107杨感病,金丝垂柳较抗病;该病主要危害树冠内主干,侧枝和树干发病较轻,病部引起伤流,引起树木上半部或整株枯死,损失严重;该病主要危害四、五年生杨树,在北方、西北方、南方位危害严重。
Europe and the United States of Yang ulcer disease is a new type of branch disease occurred in poplar in North China in recent years, the current trend of expansion; survey found that Zhonglin 46 Yang than Europe and the United States 107 susceptible, weeping willows more resistant to disease; The main damage to the trunk of the trunk of the trunk, lesser collateral and trunk disease, disease caused by injury, causing the upper half of the trees or the whole plant withered, the loss of serious; the main harm to the four or five year-old poplar in the north, northwest, South position serious harm.