杨树黑斑病又称褐斑病,是杨树的主要病害之一,病原为半知菌亚门的杨盘二孢菌和杨褐盘二孢菌。主要危害多种杨树幼苗、幼树的叶片,引起早期落叶,影响树木生长,也可导致实生苗枯死。一、发病症状主要危害杨树的叶片、叶柄、嫩梢。发病初期在叶面上出现针刺状小点,初为红色,后变黑褐色。中间为乳白色、黏状的 Poplar black spot disease, also known as brown spot, is one of the main diseases of poplar, the pathogen is the half-known bacteria subfamily Populus tomentosa and Populus tomentosa. Major hazards to a variety of poplar seedlings, saplings of leaves, causing early deciduous trees, affecting the growth, but also can lead to dead seedlings dead. First, the main symptoms of disease poplar leaves, petioles, tender shoots. Early emergence of acupuncture in the foliage-like dots, the beginning of the red, dark brown after. The middle is milky white, sticky