1987年大庆市牧三林场新发现一种杨树溃疡病菌为害小×黑Populus simonii×nigra,感染植株初期出现变色病斑,逐渐扩大,最后树皮呈黑褐色,坏死成溃疡病斑。主干和小枝直径在2厘米以下,一般不产生典型的溃疡病斑,且感染后迅速环绕一周,造成病斑以上部位死亡。后期在枯死或濒于枯死的枝干上出现病症。经鉴定与辽宁新民地区报道的病原菌为同一个种,即球二孢属的一种真菌Botryodiplodia In 1987, a new species of Populus simonii × nigra was found in Muhe Sanlin Farm, Daqing. In 1987, the infected plants appeared discoloration and gradually enlarged. Finally, the bark was dark brown and necrosis became ulcer lesion. The main stem and twig diameter of 2 cm or less, the general does not produce a typical ulcer lesions, and swiftly around the week after infection, causing lesion above the death. Late in the dead or dying limbs appear on the symptoms. Identified with the Xinmin area in Liaoning reported the same species, namely a fungus Botryodiplodia